Workshop Topics


Welcome to Instructables

On this page you can find links to some of our most frequently asked questions. What is this site? Instructables is a community for people who like to make things. Our community shares what they make in a step-by-step format that we call an Instructable.How do I post an Instructable? We offer a free and easy online class to coach you through posting your first Instructable or you can just wing it and start a new one today. How do I get help improving my Instructable?Ask the community for help in The Clinic. How does my Instructable get featured? The best way to get your projects featured is by following the Featuring Guidelines. Where can I learn more about contests? Our Contest FAQ has all of the information that you need to know about contests. What contests are launching soon? Check out our list of upcoming contests. Are you on social media? Yes! Follow us on Pinterest, Instagram and Twitter. How do I contact Instructables directly? The best way to contact us is through our Contact Page.

Topic by randofo    |  last reply


Squishy Silicone (shore hardness 30-10) with 4 ingredients

I owe my findings to the maker of "Oomoo" and community of hobbyists; thank you everybody! I needed squishy silicone, and the random knowledge I found here helped me with the puzzle pieces. The pink rectangle that you see in the pictures has the consistency of a gummy bear (shore hardness ~10). Grab: GE Silicone 1 caulk (or equivalent) Caulk Gun Odorless Mineral Spirits Baby Oil (Mineral oil) Acrylic Paint Sandwich zip baggies (medium large will help you) Cutting tool Mold negative (I use play doh because I only need basic shapes) Try to avoid glass... Don't use glass. A way to measure Tablespoons ADVISORY- your silicone (should) smell of vinegar and your mineral spirits will be potent of fumes.. and flammable. Use ventilation and protect your eyes. Your only saving grace is the baby oil scent. Okay. Grab the (new) silicone caulk and cut the whole pointy tip off of the tube, making a flush cylinder. Load that bad boy in the gun. Open a plastic baggie, and fill it with: 2 tbsp Mineral Spirits 1 tbsp Baby Oil (Mineral oil) Then shoot one full shot of silicone directly into the oily puddle of liquid. Close the baggie, leaving a little air. Find a way to mix it. I lay the bag on a smooth table and repeatedly iron the baggie with my pinky. You have 20+ minutes pot time, so be thorough. You should now have a clear 'spit' like liquid that runs, similar the two liquids you just mixed. Open the bag. Add: 1 drop acrylic/oil paint Close it, and repeat the mixing until your color is even throughout the liquid. Turn your baggie sideways and cut a small triangle from one of the bottom corners. Carefully tilt the bag like an icing baster and pour the silicone into your mold negative. This method is clean and offers control. You can squeeze ALL of your mix into the pour, as well as combat air bubbles. Don't touch it for 3 hours. Better yet, leave it for three days. It takes this long for the shrinkage to happen. You can avoid shrinkage if you use xylene instead of mineral spirits, but it is not available to me. The color will become opaque in this time as well. You now have very squishy silicone. I have tried many other pours and I can't manage to get the cured squishy consistency without mixing a liquid to start. A goop is preferable to me because I can use it a caulk, still, allowing me to 'draw' silicone positives. To achieve a shore hardness of ~30 Repeat the steps above, but now use: 1 tbsp Mineral Spirits 1 tbsp Baby Oil (mineral spirits) This will have an initially 'goopier' mix, and you will have similar pot/cure time, but no shrinkage. It will be oily until you repeatedly dry it. The picture of four silicone squares illustrates my last advice. Each mix has only one drop of the same pink acrylic paint. You may want to experiment with how much color you want. Far Left: the gummy bear mix 2:1 softest Inner Left: the hardness 30 mix 1:1 Inner Right: FAILURE did not cure (1/2 tbsp baby oil, 1tbsp mineral spirits) Far Right: FAILURE did not cure (2 tbsp baby oil, 1 tbsp mineral spirits) toughest The two squares on the right could have been made with just silicone, mineral spirits and NO baby oil. Maybe, add ~3 drops of glycerin and I could have had the same hardness AND a thurough cure, but I want the squishy. Hopefully this helps.

Topic by VRPlanesWalker  


Smallest lower power LED light project

I want to try to put two LED lights on my glasses, the idea would be to write some software to turn it on and of and notify about stuff usps trackingI was wondering what would be the smallest project possible Is there any resource where people just induced a current to light a small led maybe? showbox

Topic by stevejock1    |  last reply


What projects could I do with an industrial electric motor (1 to 7.5 HP)? Answered

My local Habitat for Humanity ReStore has a bunch of used Baldor Brand AC motors for $40. Power ranges from 1HP to 7.5 HP. It seems like a good deal since these things retail for a couple of hundred. I was wondering what I could use one of these for. Also, could I just wire one of these things up to a wall outlet to make it run, or would I need some kind of controller. What considerations should I take in picking which motor to buy? power? 3 phase vs 1 phase? etc?

Question by waltbosz    |  last reply


What is this tool for?

Can anyone tell me what this tool is for?   I came across it all rusted and thought it was some type of pliers or cutter. After I cleaned it up I could tell it was probably neither. What I thought was a plier jaw is actually one piece and does not close and what i thought maybe the cutting blade, actually had lines and numbers, like a ruler. The one small screw that the spring is attached to, will allow you to adjust how far the jaw/cutter will close and the other screw, when loosened a bit allows you to slide the little metal 'arm' in or out, like a measuring template. It has some fancy designs on the handles as you can see and the only marking says "Made in Western Germany".

Question by millsy22    |  last reply


3D printed vortex tube for spot cooling

These tubes are available as industrial supplies by the dozen but quite costly.Tried a few designs available on the net but either they are next to impossible to print using FDM or fail to provide any significant temperature difference.Just to be clear: If amient air temp is 25°C then I would like to get below zero on the cold end.And well, I would like to be able to salvage a small fridge compressor with considerably less air flow than a shop compressor.Now to the problem(s) I face:1: The temp on the cold end is affected by both the length of the tube and by how much air can escape on the hot side.Makes finding a suitable diameter and length quite tricky if you don't have fancy simulation software at your disposal :(2: The standard cylindrical design for the "engine" is not really that efficient :(To make them work a lot of pressure is required, usually they won't do anything below 85PSI and most require about as much air volume as a little air grinder.3: 3D printed parts with complex insides are a true pain to clean, seal and make sturdy enough to last more than a few minutes under these conditions.I am currently experimenting with PETG as it is a bit more temp resistant and stronger.My understanding of these vortex tubes is that the outer vortex, created by the engine, travels up the tube.At the outlet valve the vortext is split so that the fastest and hottest air escapes while the colder air is directed dow, through the outer vortex and at a significantly lower speed for the rotation.Scientists can't really agree on the directions and spin of the inner and outer vortex :(My theory is that the hot air is created by a pressure increase towards the end of the tube.As this also expands the air, the inner vortex will be choked off so to say.Only option for it is to go through and by doing so loosing a lot of pressure on the exit - the stream cools down.The circulation around the vortex spin however means that speeds of well over the speed of sound are reached.I can only assume that at this speed there will also be some energy exchange happening based on the static electricity created where the two stream "rub" against each other.So far only models with a finely sanded inner tube actually performed at all.Will one day have to try using a thick plastic straw as a liner...Questions:1. Do you think a complex, conical nozzle is required?The commercial ones all use them.However I tend to think that a slotted approach might be better.Instead of adjusting the gap of the needle valve two half cylinders with slots can create a finely adjustable outlet.Way easier to desing if all parts shall be printable....2. If 1 is not a a real requirement:How to best design the slots for the correct air flow??In the direction of the rotation?Straight?Or even against the rotation so the air will be forced out onlyby the pressure but not by direction?3. Is there any easy workaround for Sketchup that would allow me to create sphere with the required channels along the inner wall to create a fast vortex?I can do screw, nut and bolts, a sphere is no problem either.But I can't seem to find a way to comine both techniques so they work on the inside of a sphere :(Why a sphere you wonder? ;)I like harmony for these things a an egg or a sphere is way more harmonic than a cylinder.On top of that it would allow to create a vortex to my specs instead of chance.Ideally the "threads" would get a smaller pitch with every turn.This forces the airstream to not olny increase in speed (decreasing diameter) but also to be "compressed" before even entering the tube section.The inner stream would pass through a tube inside this sphere, after passing through the tiny gap the upgoing airstream created.My hope is that such a design would allow for the low flow rates of a fridge compressor while being quite small in size as well.Anyone with good ideas or tips?

Question by Downunder35m    |  last reply


I have an odd question about PVC glue? Answered

Hello my question is why dose the glue spin when it is dripped in water?  I work for a small plumbing and sewer company and I have noticed that every time the glue drips in a puddle it spins on the surface. It is pretty neat and I was curious as to why it dose that. 

Question by vince 09    |  last reply


Emergency heating.

Can you use a charcoal BBQ grill as an emergency heater for inside of a home if you were using wood as the fuel?How and what would be the safest way to do so?

Question by RonF70    |  last reply


Electric bike self powered no battery

I have a hub motor 1000 watt for bicycle, I would like a hub generator that would power the motor hub with out a battery, can anyone tell me how I can get or make something like this, or ,,it takes a 48 volt battery, can I use a 12 volt battery and step up transformer , or 12 volt car generator and step up transformer, or dynamo hub and step up transformer , or would it only raise the voltage and not amps

Topic by Lylecpitts    |  last reply


Electronics,help,feedback,community $52

How to play and rewind a craig 212 cassette player from the 70's

Topic by MaryS479    |  last reply


What is this tool?

I have no clue what this is

Question by andrefahim11702    |  last reply


I can't post a comment - get message " oops something went wrong!"

I logged in and out - no change. Is is me?

Question by chefspenser    |  last reply


Designing a working Ranque-hilsch Vortex tube to be 3D printable or machinable on a lathe

I have looked far and wide in the attempt to fully understand how these tubes actually work.Nothing online really satisfies me fully so I made my own theories ;)I won't bother you with them tough as the foucs is on giving some tips on designing these tubes.Lets start with the main components as you find them in petents and some of the online videos and tutorials:1. The tube.It does not seem to do much but it is a very important part of the design.The diameter needs to be correct for the pressure and air flow rate so the up and down vortex can form properly on the inside.The lengh is important as well because you won't the hot end outlet right where the tube is hottest.Too long and you waste more than you use, too short and you won't get a decent temp difference.2. The chamber, rotation box, inlet box or whatever you wanna call the thick bit where the air goes in that holds all parts together.Most designs, even commercial ones, seem to go dirt simple here.Inlet on the side so the air starts spinning around on the inner wall.And that's about it as it really is nothing but a simple cylinder.However, the free space and internal design of the components affect the performance of this chamber.3. The engine, diffusor or cold end tube.This little gadget, in commercail tubes, serves a dual purpose.Firstly I provides small inlets to generate several vortex stream for the tube.Secondly I provides the cold end outlet nozzle.Both the nozzle and the inlets are important for the workings.Depending on their dimensions you need a higher or lower airflow and get a higher or lower temp difference.With just these three bits you see that a lot of variables are involved.I simulated most of my parts, but with the lack of proper software this happened in the empty void between my ears ;)Needless to say I learned a lot of ways to design fance looking tubes with no real function LOLIf you use some aluminium tubing for the actual tube and machined parts you have an advantage over 3D printed plastic parts.Not just in terms of safety but also in terms of actually measuring the temp of the tube.Blessed are those who have a heat vision camera :(Either way, once you start the design there will be a lot of errors you would need address later - and they waste time and material.Let me share my thoughts on how designed my first working tube:Compressor delivers a certain pressure and flow rate.I made something to test how different diameter holes as a substitude for tubes would affect the air pressure and flow.Once I had a diameter that would not drain the compressor and kept a stable pressure I used this to calculate inlet and orifice sizes.Goal was to have the same overall cut area as for what worked on the compressor test.For example if a 10mm hole works fine than a first guesstimate for 5 inlets would be a 2mm diameter.Usually slightly more as interal friction and such create more pressure in the system.So far for the inlets and vortex creating parts - what about clearances??Imagine you have a short cylindrical space where the tube shall be mounted to.Your inlets need to have enough free space to allow for the air to spin around the center.Key is to have the clearance tight enough to keep a high pressure in this area.Imagine the 5 2mm holes from the above example providing the air flow.A 1mm gap would mean insane pressures that most likely will limit performance.On the other side a 8mm gap will cause a massive pressure drop and results in the vortext from the inlets to get chaotic.Hint:If you blow compressed air through the housing with the engine inside but no tube mounted and just a backing plate to close it then you should hear a distinct sound.If it sounds just like air escaping through some holes you got it wrong :(However, if start screaming like mad when the pressure goes up it means you created a quite powerful vortex ;)But don't confuse the sound of small holes with something that almost sounds like a siren ;)A tube lenght of around 15cm seems to work fine for most applications.However it makes sense to check the tube temp to make sure the lenght is set to the hottest part of it.If in doubt, try it out ;)You designed it so well, it makes all the right noises but it won't cool or get hot....I had this problem a lot in my early days.An old patent however gave the clue that you won't find that easy.On the hot end outlet you can use a simple cone to limit what comes out of the tube.Either with fancy internal outlets or just outer casing with slots.Not much different to what you find online.What you might miss though is the diffusor or vortex terminator.You see, the upgoing vortex is extremely fast in it's rotation.If it hits the outlet cone like this then most of the air will be forced out and the inner vortex won't form at all.A star like insert at the end of the tube will cause the outer vortex to become a straight upward stream.Not all of the air will be able to fllow this route, so the rest is refected and creates the inner vortex.A tiny detail that often gets lost it seems.

Topic by Downunder35m  


Iris mechanism

Hi everybody, I'm a complete newbie and I wanted to make something for a project of mine that involves an iris mechanism and a stage that comes up through the opening. I've tried to search for a unification of the both, but can't seem to find any. Can you give me some pointers as to how to incorporate the two mechanisms in one apparatus? Thank's a lot guys

Topic by rsyauta  


How do I thin out 2-part epoxy?

I'm wanting to make some micarta-like material, using two-part epoxy and paper. I've done a test run, and the material was rigid after it had cured for a few days, but didn't cut like I hoped it would, because the epoxy didn't penetrate the paper. Part of the issue was that the paper was coated, but I'd also like to thin out the epoxy some so that it will soak into the paper better. I'm inspired in this endeavor by these two instructables: https://www.instructables.com/id/How-to-make-homemade-micarta/ https://www.instructables.com/id/Mokume-Kireji-DIY-Woodgrain-Composites/ The epoxy I'm using is 3M Scotch-Weld DP-190. The label says it contains epoxy resin, polymeric diamine, kaolin, and carbon black. The complete MSDS is here. This is what I'm using, because it's what I have. Got a case of these two-tube dispensers cheap at a yard sale. :-) So, what can I use to make this more liquid? Right now the consistency is a little bit thicker than honey. It doesn't spread out when applied to paper, and doesn't soak in at all. My limited knowledge suggests that toluene, listed on the MSDS, might work, but I'm hoping for something a bit less volatile. I'm aware that whatever I do is likely to extend the curing time, but that's not necessarily a bad thing.

Question by yoyology    |  last reply


Where can I buy perspex cylinders?

I've finally managed to get my van which I'm converting to a stealth camper. I want to maximise roof space for solar and don't really want to fit the traditional 12" square roof hatches or side windows. A simple, basic solution to letting daylight in through a small opening is the bottle through the roof filled with water (). This looks really effective and seems to spread natural light through the room/van in all directions which is an improvement both in footprint and lighting over the square hatch. I was thinking of trying something similar but a little more high tech. Maybe a simple, solid, perspex cylinder or maybe dome lenses above/below? There are "tunnel skylights" but I really don't need a tunnel since it only has to go through the thickness of the van's roof. Any ideas?Thanks,Mike.

Question by ImmortalSoFar    |  last reply


Parabola Jig?

I want to make a parabolic dish out of wood.Given a glued-up stack of plywood (each layer being a ring cut to approximate shape) I want to use a router to cut a parabola out of its center.Does anybody know of a jig or mechanism where a person could accurately do this?If you can excuse my MS Paint graphics, above is a side-view.

Question by PS118    |  last reply


3 phase wind generator

I am making a generator for me wind turbine and I have 12 neodymium magnets that are 50x25x10 size and 16 gauge enameled wire if you could tell me how many turns I would have to do in each coil and how many coils to do according to the 12 magnets and how much would generate the generator

Question by Lucagustavocardozo    |  last reply


Help identifying tool. Do you know what this is and what it it used for?

Is anyone able to identify what this tool is and what it is used for?

Topic by Cru007    |  last reply


Server Errors Prevented Publishing (and therefore missed contest deadline)

Last night about 15 minutes before the contest deadline, I began to submit my Instructable, but was getting errors saving & publishing. I kept trying past the deadline and it finally worked at 12:12am, at which point, the contest was no longer available.I have a screen recording as well as some debug screenshots using Chrome's Inspector.

Topic by keith204    |  last reply


Why should perpetual motion be impossible?

Our laws of physics are quite clear when it comes to the impossible.You can not produce more energy within a system than what actually goes into it.And since friction will always be a thing in our real world perpetual motion is simply impossible.With this or quite similar reactions all good scientists end the conversation.We know it is not possible, so why bother...If all that is stopping are laws of physics, then it is time to redefine "perpetual motion".Another term for it would be "free energy" as we would have to draw energy from nothing to keep it moving.Solar cells provide free energy the same way as wind- or hydro generators, we even use waves on the ocean to produce electricity...Perpetual motion seems to be defined by mechanical things and motion only.And free energy seems to be defined as bogus only while ignoring the realities.We simply can't use the same terms for everything if they are in fact totally different things....A motor running off a solar cell would be a perpetual motor if you widen the energy term a bit here.The impossible energy to run the motor comes out of nowhere - our solar cell generates electricity from sunlight.And a simple water wheel in a stream will power a mill for as long as water runs down the stream....Humanity and science say this is not free energy as we take energy from other system to make it move.And of course it is a dead simplification anyways.You get the picture though.So far humanity has only managed to tap into a very few forms of energy out there in any direct form.Solar cells come to mind first of course.In a way they utilise radiation to transform it into DC electricity.Then we have all sorts of mechanical energy transfer, from generators over windmills to the modern recovering brakes in electric vehicles.Last but not least we have heat, steam engines, nuclear reactors and so on.The laws of physics however know a few more forms of energy....We seek out new ways to "generate" more electricity than ever before, like fusion reactors.What we don't seek is understanding what we always had already.All we do it to try to "generate" electricity.It is what powers our world but it is only a tiny fraction of what is possible.We burn fuel in a comustion chamber to make piston go up and down.Only to transfer this motion into a rotary one to finally drive our wheels.Most of the energy available in the fuel is wasted this way.Making it slightly more efficient took us over 100 years....Thinking about using the fuel more directly does not even come to our minds.So why bother to consider any other possible form of energy to drive our world.We are stuck in definitions no one really understands because most of the used terms have more than one use and meaning.We fail to open our minds to other possibilities just because "that's how it is and always will be".Flying to the moon?? Impossible!We did it anyway....Using batteries to provide electricity to entire towns? What a joke!In South Australia they do it anyway and with great success as well.Powering entire cities just from wind and solar energy? Are you joking?Well, companies invest an awful lot of money here and they wouldn't do so if it would not make massive profits...So why again should perpetual motion be any different?At some stage it was hillarious to even think our world would spin around the sun.....

Topic by Downunder35m    |  last reply


What is this tool and what is it used for?

Does anyone know what this is and what it is used for?

Topic by Cru007    |  last reply


what is this? identify my tool!? Answered

I had this for years, anybody got a clue what it is? most amusing answer gets a patch:-)

Question by crazyg    |  last reply


CHUCK help please.

CHUCK help please.Im searching for a chuck replacement for a 1944 Delta drill press. It has a Jaobs Supreme 5/8". Arbor is MT2 shank with JT3 small end. The supreme has teeth missing on the gear, the key holes are egged out and it will not open or close smoothly. Can't afford a new Jacobs so I'm looking for an Taiwan import or any ideas you may have.thanks

Topic by 4063ford    |  last reply


Can portland cement be mixed without sand or gravel?

I'm planning to switch from wood to cement because we are soon moving into a condominium where noise should be kept to a minimum. If yes, what is the ratio of water to cement? if no, can i mix it with sand only and what is the ratio. Thanks

Question by beehard44    |  last reply


GY6 50 cc chinese scooter won't start. What could it be?

Hi. I bought a 50 cc scooter that was sitting for some time. It's 2008 model and it had around 400 km when I got it. That's pretty low in my opinion. Well at first it was running fine. I mad around 100 km on the first day. Well the second day it didn't start. Thankfully my friend helped me and he said that my carburetor is dirty. He celaned it and scooter started up. I made around 60km on the same day with no problem. In the morning the next day my scooter wouldn't start. I tried to do the same as him. I cleaned carburetor and fuel filter but scooter still wouldn't start. It doesn't start electrically or kick start. It's like 5th day and my scooter still won't start. What happens when i turn it on:  - sometimes it sounds just like a dc motor spinning but nothing happens (there is no cranking sound)  - usually it makes cranking sounds but doesn't start  - when I let it sit for a while (for 30min, 1h, day ...) it makes a sound like it almost started up but then dies Thank you all for help! I would like to apologize for my lack of english words in engines and bikes field (not a native english speaker and I'm not specialized in those fields).

Question by matijalazic    |  last reply


Hanging flower box

I have a large front window that goes down to sidewalk, and we want to add a hanging flower box. Any thought on best way to attach a flower box? Attach to metal window frame? Add plywood to window to attach box? Any input gladly appreciated.

Question by CarolynV23    |  last reply


Makita cordless mitre saw 36 volt

Can anyone help to convert 36 volt makita cordless brushless mitre saw so it can be used from mains power ?

Topic by GregW181    |  last reply


Creating copper nano particles

Be it conductive ink, decorations or just a special pigment for your paint project, Copper is nice.Only problem is grinding this soft metal fine enough to be of any good use.A not so well documented feature of food additives is that they often have "unwanted" side effects.In our case E300, Ascorbic Acid or just Vitamin C.So how to make copper nano particles with it you might wonder?Prepare a well saturated solution of Copper Sulphate, you find the blue crystals in the gardening section together with fertilisers.It is best to use destilled water and not plain tap water, if in doubt go at least with the demineralised stuff for batteries.Adding E300 either dissolved in water or directly as crystals will start a nice reaction.The copper solphate is reduced back to metallic copper.There are a few problems though...For best results you need a saturation copper sulphate solution, low temperatures and a magnetic stirrer.This produced the finest particles for me at around 5°C.But even warm or at room temp the constant sirring is beneficial for even particle sizes.The ascorbic acid is used up in the process as well.You can start with a little and see how much you end up with in terms of a layer of copper particles at the bottom.Adding more E300 will cause a "rain" of fine copper particles - once this no longer happens you know the copper sulphate is used up as well.A dark greenish color of the solution will indicate this as well.Getting the copper out of the glass...Keep in mind the copper is extreme fine!As long as it stays in the solution it won't oxidize or otherwise react.Once out and in contact with just water and air oxidation happens quickly, after all it is pure copper...I found removing the watery solution and then adding destilled water to repeat the process is a good start.The waste from the first round can still be usefull though...In the final round I try to remove as much water as I can and then add methyled spirit to prevent the reactions.You can use oil as well or do a quick vacuum drying and store it in a sealed and oxygen free container.What to do with it?As a condictive paint with the right binder it only needs some rubbing with a smooth tool to create a conductive cover with a low resistance.In a clear paint or resin it provides some stunning color effects.You can even dust the dry powder onto a freshly painted surface to get a copper look.Leave without a top coat and you quickly get an old copper or even green look.If you ever wanted extreme fine metal particles you will come up with more ideas...Like shielding or sintering....

Topic by Downunder35m    |  last reply


Options to save on gas while TIG welding ?!?

It's been a while but last weekend I had to some quick TIG welding for a friend with no clue how to use a TIG welder at all.Still wonder why he felt the need to buy one LOLAnyway, the regulator was quite crappy and seemed to only provide next to no gas flow or literally a massive blow from the hand piece.Back home I started to wonder why there is no batter way to direct a smaller volume of gas to keep an inert atmosphere around the welding area.There is a relation between tip position, arc length and nozzle diameter.Obviously the more amp you need the more gas you might need.There are guidlines for the flow rate in regards to the amps used for a reason.And anyone who ever tried to use a TIG welder outside on a windy day knows only too well how costly or annyoing the job might end up to be.A fancy kitchen range hood I saw years ago popped back into my mind.It was a costly designer thing that used directed vortex streams to "suck" away whatever comes from your pots and pans on the oven.Worked surprisingly well and with low noise too.Shouldn't it be possible to make such a design work "in reverse"?A vortex style ceramic nozzle in the hand piece would allow for a much lower flow rate while still providing a strong and concentrated flow of gas right on the welding area.IMHO it should also allow for a much more stable plasma/arc.According to my guestimations a reducion in flow rate of 40-60 should be well in reach - a considerable cost factor...Too bad I can't used my 3D printer for ceramic :(

Topic by Downunder35m  


Making a proper fire brick or refractory liner

If you are cheap like me then paying an arm and a leg for commercial grade refractory mixes or ready made bricks is no option.And how wants to make their design only to find there is no matching bricks for it...There is lots of totorials online and here on Instructables that deal with making heat resistent bricks and similar.And this is all well and good for normal melting applications or your pizza oven, not so much if you really need intense heat.I found that commercail mixes tend to be either really brittle once heated up or that they will glace up and even melt.So why not make my own mix...Ingredients:Fine sandCrushed PerliteVermiculiteSodium SilicateThe first three you find in basically every home depot or garden center.The last can be made from crystal cat litter and sodium hydroxide.Use proper PPE please!For a refractory mix I use:100ml of clean water.60g of crystal cat litter.About 35-40g of Sodium Hydroxide.This will provide a very silica rich solution.Use a high jar or similar and fill the water in.If you have use a magnetic stirrer, otherwise be prepared for manual labour.Add some cat litter but not so much that stirring becomes a problem.It will fizz around a bit and when it stops slowly add some sodium hydroxide.The mix will heat up and the cat litter starts to dissolve, once it is gone add some more.If it becomes hard to dissolve them add a bit more sodium hydroide but avoid letting it get too hot and so it boils!!A bit of steam is fine though.Towards the end you should have a quite hot mix with all cat litter inside and a bit of sodium hydroxide left.See what dissolves and only add as much as you really need.40g is enough, if it won't dissolve the cat litter then keep stirring every now and then and add some external heat, like placing it in a water bath on your stove.Once all is dissolved the mix is ready and should keep the jar closed to prevent it turning it a rock hard cement...Make sure your dry ingredients are well mixed and relatively fine in particle size.DO A TEST WITH JUST WATER!Take a defined amount of your mix, like 100g and see how LITTLE water in ml is required to turn in into a plyable mass like green sand.Note down this relation to get the right mix with the waterglass.To keep the mix workable you want to add the same amount of clean water to the amount of waterglass you calculated.If it is quite cold day you can leave it undiluted but give it a test on how long it takes to set on the surface to get your working time.Make sure you really mix it all properly to enuse the waterglass wets the surface of all aggregates in the mix.Press into your prefered form, remove form and let air dry, preferably on some wooden sticks so they won't accidentally fuse with the surface you have put them on.Once you have enough to fill your kitchen oven put them in at a heat of about 80-90°C for 3 to 4 hours.Open the door every now and then to let the moisture escape.After that they can be fired up to become fully fire resistent.Do this slowly as there might still moisture be trapped inside that needs to steam off, not boil off as it might crack the bricks.Once they got a good glacing from being used they might fuse together but should not constantly crack and melt like some commercial products - plus it come dirt cheap in comparison.

Topic by Downunder35m  


Looking for wood projects (garden, planter, home, etc)

Looking for basic wood projects using, 1" x ?, landscape timbers, pallet wood, etc than I can make and resell.

Topic by JerryM160    |  last reply


Any ideas about how to refill vintage selzer bottles (aka soda siphons)?

I’m wondering if anyone has any insight into the hardware adapter and technique required to refill antique glass selzer bottles. I understand that they were refilled through the nozzle in upside-down orientation with a special connector on the vintage refill machines, but there’s very little available info out there I figured that with the easy and cheap availability of CO2 kegging systems for home brewing that a bulk filling mechanism might be set up to get around the expense of proprietary systems like SodaStream, or without the waste of dealing with small and pricey 1 liter co2 chargers. Would also be great to put those old heavy glass bottles back to regular daily use.Thanks!Joe

Question by joepmurray    |  last reply


I accidentally poked small hole in freezer cooling line, can I patch it with flex seal or something like it?

Was de-icing my haier mini fridge, when I accidentally punctured a tiny hole in  freezer wall cooling line, it hissed for like 2 seconds. Is it safe to plug back in? and can I patch the hole?

Question by brandon.salinas.319    |  last reply


Paint thinning question

Hi,I have some military grade paint that contains xylene.With all dangers of explosions and fire risks aside, will petrol/gasoline be able to act as thinners.I have a feeling that I did this years ago but cannot be certain (and all google searches seem to be about adding xylem to gasoline).I am not after a perfect finish; I will be using a roller to Mad Max my car but even so I don't want to create a chemical reaction that will ruin or curdle the paint.I am too mean to buy the correct thinners; this is a £20 project and the budget is up.Thanks

Topic by FriendOfHumanity    |  last reply


Does anyone know how to identify a ring? Answered

I have a ring but i dont know what kind so could anyone please tell me if they know a way to identify it, Thanks.

Question by tastur26    |  last reply


Relativity and why E can't really equal m²

See this topic as something that should be in our now deeply missed random fun section.Everyone learned in school that there was Albert Einstein and we have to thank him for bringing humanity into the next evolution.At least in terms of understanding the universe, quantum physics and things like this.Over the years I developed my own funny theories on why Einstein was so stunned that his calculated energy output from the first nuclear test was off by a factor of about 4 - meaning his calulations were at least 4 times lower than the real thing....The official story about this "mistake" is something like this in a destilled and drastically simplified way:"We did our best but this totally new terrain, theory got corrected by real world test.We now know how to factor all this in correctly for selfsustaining nuclear reactions with a critical mass."The real explanation with all calculations and so on was document of about 200 pages....The inoffical story about the first test and the corrected results was a bit longer and personal.Nicola and ALbert had a long hate-love relationship.Similar interests and theories got them together, diference in the opinion what can be put into our current math system for calculations and conflic of used terms got them apart.But like every good couple they always got over their differences and corresponded again - sometimes with a year or two before they were ready to talk to each other again.In this story Nicola had massive arguments with Albert about the required, sustained and released energy levels for Gadget - the first test of the Trinity series.To give you an idea why it was so hard for both to understand the other or to accept the other's calculations:Einstein based all his theories and what we use today when it comes to math.Tesla however prefered his own mathematical system, one he promoted and got into every day use in many US schools at the time.In simple world it was based on a big circle, I like to call it the circle of math.Almost all of our natural constants (that were known back then) were present as lines, multiplication, squre roots and more were as easy as following the right lines and pathways indicated on this circle.Both system, ours and Tesla's provided the exact same results, the later however without any need for additional "notes" along the way or complicated formulas.And even worse when it came to energy.Back then science alrealy knew there is more than what our laws of physics state and what we know.And what we could not really understand and only proove in theory is now as common as butter on your bread.Thinks like quantum mechanics, quarks or the fact that you can't observe a light particle on a quantum level directly, only as its sum....Tesla however already had "a higher understanding" on how different energies interact and how get from one form of energy to another.Like his tesla transformer, the radio transmitter and so on.While we had no clue at all Tesla already studied the ionosphere, he had different name for it though.For him it was obvious that it is not just a reflective barrier for radio waves but that it also has a very energy potential on its own.Either way the argument was the Albert only factored in the mass of the nuclear material, the explosive forces from the ignition and the corresponding implosion.Basically everything we could see, explain or theorise about back in the day - and it needed to be possible to claculate it somehow to match expections.Nicola made the claim that during the explosion also a lot of electromagnetic energy is created together with what he called a break in the fabric of the universe.Not only that but the electromagnetic shock (we call it now EMP) is not really a single thing but spread basically over the entire know frequency range, including visible light.The visible light claim was confirmed during the test by shadows burnt into walls....You can clearly imagine how good old Einstein must have felt seeing his good friend being dead serious about things he could not have the slightest idea about.After all there never was any test before and certainly none with Tesla present...How the personal story between the two continued can be found online if you some digging or if you prefer in a well stocked library - yes they still exist as real place ;)What was mostly left undocumented, at least for public eyes was the implications from the Trinity test series.That Tesla really was onto something even if the smartest man on the planet could not understand a single word of it became painfully obvious.At least for Albert....In his later theories you can find the influence the revelation of finally understanding why his calulations were of and most importantly understanding what Tesla meant by the fabric of the universe.E does not really equal mc² for quite a few reasons.Firstly because it is based on the assumption that nothing can be faster than the speed of light.So did our best to measure it, cheated by making definition of light speed and meter based on the same thing.I mean: If you take two "unknown" variables to create a result and then use the result to finetune the input- how accurate can it really be?....Today we long know that there things travelling much faster than the speed of light, for example gravimetric shockwaves when a distant star goes booom.We detect these "gravity quake" now so we can aim our big telescopes to where it happened and see it in "realtime" once the light arrived long after the shockwave.And if you dare to re-do the original calculations for Gadget and factor in that a gravimetric shockwave travels about 4 times fast than light you get an idea why Tesla already knew all about it.What came out of all the offcial calculations and theories is well known.What is missing from E=mc² was never officially published by Einstein...Applications for the possible damage to what Tesla called the fabric of the universe.We are trained to only use our brains in two dimensions.A bit of it comes from our evolution as since the dawn of time we prefered creating a flat image over creating a sculpture with similar details.Some people though can use their brin in three dimensions with ease, like when a really good sculpture artist say "The sculture is already in the rock, I only need to remove what is covering it."And sure enough every color or texture detail of the rock ends up in exactly the right spot to make the result perfect.Musicians are quite similar, a lot of them have no clue about notes or how read them to create a nice tune on an instrument.Some only need to hear a song once and can repeat it on all instruments they play like they studied the song for years.Others hear the vocals only and create tunes and melodies from it that not only match voice act but also reflect on the mood, the feelings.In some really good songs you only need to hear the instruments and can almost imagine what the singer would sing to it...A very few can do similar with math, we like to call them a genius because we can not imagine a complex and long number as a series of meaningful images or emotions paired with colors - for example, as there many more ways to deal with numbers...People like Einstein realised after the Trinity tests that the EMP and corresponding electromagnetic effects are too strong to be measured by anything unless it is from a great distance.That means, like lumen per area, the strenght of the electromagnetic effects increase exponentially the closer you get to the source.Still... No big deal right?Well if you dare you make a frog levitate in a magnetic field, won't be a healthy experience for the frog but it will levitate.You can look these frog experiment and corresponding scientific explanations up online if you are bored enough one day.The point is: If a frog can be excluded from gravity in a magnetic field of suffient strenght, orientation and other features, then what else can "float"? ....Or more to the point: Why exactly does the frog float if he is not magnetic enough to begin with?....We have no problems visualising or imagining the shockwave from a big explosion like Gadget.High speed films show us that there would be an expanding perfect sphere, only object like the ground limit this experience, but you see it nice in underwater explosions!What most people can't even begin to understand is how a shockwave of which the EMP is only a small part acts, travels or what effects it migh thave.Unlike a normal shockwave we have something like redox reaction happening.The explosion creates an unimaginably strong electric impulse, a bit like all lightning strikes in world feeding into a single lightbulb at the same point in time.For argument sake lets say is almost indefinately high.However, like in an ignition coil this impulse creates and equally strong electromagnetic impulse.And since the entire reaction at this point is far from over we get a harmonic resonance and feedback system.Imagine a second you stretch around the globe as a band and then you cut a mm off it - that would be about the timeframe for the most intense electromagnetic field swinging around at all sorts of frequencies.And during this very short period of time a bubble is created that expands what modern sciensts now call the space - time - continium.Same name as in the movies but this time based on quantum theories and such things to explain gravity.An awful lot of energy is trapped inside this bubble and once the initial reaction is over the electromagnetic impuls disappears and only the normal reaction from the explosion continues.The bubble however does not pop or disappear, it implodes.All this energy is compressed basically to a single atom size and released.Sadly this energy has no visible effect, nothing we can observer with our eyes or instruments...Again we use quantum theories to explain what must happen to find way to it "visible" somehow or to find way to really measure it.Gravity sensors are a result of these theories and developments and now part of basically any good GPS satellite or space probe.Some fancy phones have them too.What would actually happen if we would have found a way to affect the space time continuum in a very controlled way?Without explosions or such bad things, just by using simple technologies.Now I would have to explain things in at least four dimensions, which means most readers would shut off now.Using five would be insane, I know :(So let try to ignore how things work fr real and do what every good scientist does: simplify to make the imagination work in just 2 or 2.5 dimensions.Put a cork on a pond a throw a rock in it.It moves, mostly wobbling on the waves but it moves away from where the rock was dropped.If it could be "anchored" at the right spot between two crests of the wave it would move with it, like a surfer on a good wave does.A craft that creates our field from the inside and in a neutral configuration would create a perfect sphere.What would that mean for the craft and those outside observers?At a first glance nothing until you realise the craft has no mass at all.You could lift a 5 ton vehicle with your little finger and flick away like something you found in your nose.Unlike our suspended frog the craft would create a field bubble where gravity diverts around it.Gravitity is the driving force of the space time continuum.Without it there would be no time, without time there would be nothing.If you would be inside the craft and be flicked away by a finger you would only realise it if you looked out of window or onto a screen showing the outside.As the craft does not exist in the normal space time continuum, so to say, the same non existing effects of things like acceleration, g-forces and such can't apply for what is inside either.Well, at least until you reach the wall, the suddenly all is stopped and has to enter our normal continuum again.You would be mince meat on some wall inside what is left from your craft...Increase the field strenght to overcome inertia of smaller particles and even air molecules or dust particles are diverted around the field.Nothing though that would rival the mass of the craft in a significant way, like flying into a solid wall or mountain....A modfied field geometry allows to affect the shape of the bubble.To keep it in two dimensions, imagine a ping pong ball as the field that you press into some slime, or similar fun stuff.Start moving it and it forms something like a wave in the front and something like a wake on the other side.Our field can shape the bubble so that our space time continuum would look quite similar - if we could see it instead of theorising about it.As result the craft now moves in our normal continuum without having and appearent form of engine.The bigger you make these "waves" with your field, the fast you go....And suddenly those impossible movements in the sky that are always dismissed as a hoax or weather balloon make a lot more sense.Be it a Scalar drive, the Fluxliner, VR7 and derivates, they all use garvity as a propulsion system.Fair enough you might say, but what does mean in terms of where we might have been already since almost one hundred years....A gravity based drive system in the sience fiction section has many names.Warp Drives of course comes to mind first.But also FTL drive or Jump Drive.Just because gravity waves are much faster than light already means lightspeed is not really a limit and hasn't been for a very long time.Why do you think superconductors were first developed by/for the military? ;)With no mass it is only a matter of the avilable energy how fast you can accelerate and what top speed you can reach....Or to be precise: How effiently you can create an insanely strong electromagnetic field.Make you wonder what else came from understanding what things like a Hedron Collider can do...With an estimated energy output equal to truck sized generator you could make it from Virginia to Mare Tranquillitatis in about 10 minutes.Make it 30 if you want to get out and stretch your legs when you are there.Some now say "I don't care who or why someone goes to the moon."But what about those who think climate change is real and how we produce and use energy plays a big role in it?Let alone those actually considering that fossil fuels might run out one day....If you have a gravity drive then you have a very neat way to create almost limitless, clean energy.....I leave it up to what it would mean if everyone and everything in our world would have access to free and virtually unlimited energy....Isn't it good that all this is just a nice story and that all is just fiction with no relation to reality?But if E does not equal mc² then how relative is our reality really?

Topic by Downunder35m    |  last reply


PE backed Heat Reflector

I started using energy saving aluminium heat reflector s being house radiators.We used a Fixman double sided tape tape as this keeps on peeling off from the PE backing.DSA is stuck to the wall and it remains tackey!Can someone recommend a suitable adhesive to keep the reflectors on the wall.

Question by RastyG    |  last reply


Indoor framing: Taken to another level.

We all love to mount stuff to walls to get it off the floor. Makes things so much easier to clean when the floor has nothing on it. But we also don't want to put holes in or deface the wall. Especially if we're renting. So then we get floor mounted stuff and the floor is a headache to clean. It often takes way more time to move the stuff off the floor than it takes to clean the floor! Imagine if instead a frame was devised to line the walls. Something like 4x4's for the corners or make the entire thing out of something like 2"x2" slotted steel angle. Its extremely strong holding a lot of weight for spans of over 8' without flex. If course its not completely off the floor but pretty close. Once you have the corners and horizontals in place you can hang/bolt anything to it. It takes space organization to an all new level. Look around your room that you want to organize and try to envision being able to mount anything anywhere in that room and have it off the floor if so desired. And have it stable. One thing I haven't figured out is how to anchor a vertical post to the floor without drilling into the floor. One option would be a high friction material like artificial rubber, maybe 1/16th or 1/8th thick that goes between a plate on the bottom of the vertical and the floor. If it was loaded with a lot of weight surely it wouldn't move. Another advantage to this is in the event of an earthquake it would add structural integrity to the room for those of you on the west coast waiting for "the big one". Or it might act as a roll cage for your house as a hurricane blows it off its foundation!I put this under Workshop but I have no idea if that was the best one.

Topic by SpencerW  


Automated Badminton Shuttlecock Launching Machine

There was 1 machine in my mind I like to challenge myself which is an automated badminton shuttlecock launching machine. Over the internet, there got some simple manual loading machine. But the one I like to challenge is similar to below link:https://www.youtube.com/watch?v=Gwg-Ge4gu9gAutomated with dozen of shuttlecock ready to launch to several position.Anyone able to assist?

Topic by AlexL361  


Are there maker/tech/work shops/spaces in or near the Portland Oregon area ?

With how big being a “maker” is in Oregon, I’ve been unable to locate any workspaces here.

Topic by Sgtcombs    |  last reply


Develop - Protect your invention

Hi All,Has anyone found a good article re: developing and then protecting your invention?There are all these TV ads for companies to help you file a patent application which seem dubious.Have you found other forums besides here to ask questions as you go along and develop your invention?Are there any engineering forums where you can discuss with design engineers how to build a prototype or model or create blueprints for it?Thank you!

Topic by eager to learn    |  last reply


Single PCB manufacturing sources

Hey all, So I found a project on here that will fit my needs for issue I have. It has scematicats and a board design. Are there services that make up these items? I really only need one or two made so not sure the big PCB guys will take it on. Any leads appreciated!! Thanks PPVSteve@Gmail.comProject: https://www.instructables.com/id/Simple-manual-control-of-stepper-motors-without-a-/

Topic by SteveW306    |  last reply


Tesla's earthquake machine - was it just a practical joke?

Nicola tesla, in his early years, was not shy when it came to use science through direct contact.Most of it we would call today playing practical jokes on students and friends alike.His harmonic balancer got the nick name earthquake machine.I won't go into the story how all came together, you can read the story on Wikipedia or other sites to the fullest of your imagination.Howver, I would like to go into some details of this invention.Or better: I will try to explain my view on why this machine might have actually worked close to what the story tells....Studying old paents and other documents is no fun and not always you can reach any valid conclusions from any of it.I mean, if you coud then you wouldn't need a patent for it.Some things however are so good, so special that they never get a patent, the company keeps it as an iternal secret.Same way a brewery won't tell you the exact recipe for the beer they make ;)The harmonic balancer has very little to go with except stories and some comments Tesla scattered here and there.So let's start by some claims Tesla made about this machine:1. It has a free swinging mass.2. The mass is balanced using "air springs".3. It usues very little energy.4. It finds the harmonic frequency of the object attached to automatically.If you think about the above you could say right away it is bogus.But think about the terms and language of the old days ;)Add the fact that Tesla never really gave any direct answers to how his inventions actually work and you see where I am going here.Point 1 and 3 are easy to imagine in many ways.Number 2 on the other hand contradicts itself at a first glance.But, if you place a piston with a good mass and good seal into a cylinder nd close both ends while the piston is in the center....A bit like these to shake emergency torches and flashlights.With that idea in the back of a head one can imagine shock absorbers and more.And a "mass" "swinging" in such a sealed tube would certainly be subject to the "spring" force of the air being compressed in front and the forming low pressure on the other end.The last one however had me stumped for almost two years with me getting nowhere.A mechanical system can't adjust itself to the harmonic frequency of anything....Then I saw a collection of funny videos.One of the clips had about 100 metronomes standing on a board.The board was place on two rollers so it cold move freely from side to side.All the metronomes wre set to about the same timing.But of course you just can't start them all at once or even so they swing in sync.After just a short while though, one by one found a matching partner on the board.Faster ones slowed down, ones totally out of sync seemed to miss a beat here and there.And then it hit me!Hundret swinging masses on a board and the board moves together with them!Once all were in sync and harmony the board moved basically exactly the same way sidewas as the single pendulums above.Number four finally solved :)How though could one try to replicate this impossible invention these days and without knowing any exact details anyway?We know it used one or two electromagnets.These moved the mass back and forth horizontally in the machine.However, it was more formed like a T wih a fat base.Tesla needed a dead simple way of doing with electricity what the metronome does just mechanically.If you have a little mass on a spring and one contact on the spring plus another on a tube that is around the mass - what do you get?No, not the trigger for something really nasty when you pick it up...Right! You get a motion detecting switch.A bit like our gyroscopic sensors do now in our phones....And if you cut the tube lenghtwise you end with two opposing contact to switch two magnets on depending on what side of the tube is hit by the mass (contact) swining on the spring.Try it out with a spring from old pen and a screw inside as a weight - quite sensitive if you get the weight right.Some drawing suggest he height was about the same as the width of the machine.This would suggest the contact was actually hanging upside down, so it could swing in the wider base.A bit of fine and very flexible opper braid with a weight would make a nice pendulum here....Do a little experiment first though ;)Make a sturdy frame or if you have none try a truck. ;)If you place the frame on wheels and a pendulum with just a string and some sinker at the end - what would happen if you move th frame sideways instead of swinging the weight?Inertia keeps the weight in place while the top mount of the string moves away.And if the weight stays in place for just a fraction of a second before starting to move with the frame?Correct! since the angle of the string changes, the ball appeas to move up.Not really by much but enough for an electrical contact to open....We have some ideas now on how those electromagnets might have been triggered by Tesla, what about the mechanics of the moving mass that claimed to have created earthquake like results?Precision is no problem these days, just check these toy kits to build your own Stirling engine or you trusty old Swiss Army Knife.And even a second hand air cyclinder and piston can be modded to act like a free swinging air pump.Only question that really remains would be how to match the mechanical system with the electircal?We have two seemingly independent masses, one to make things move violently, the other to energise the part that make the first mass move - or to be precise to give it a tiny push in the right direction.What does mean you wonder...Let me try to simplify it down a bit.....If you push someone on a swing you can have a very hard time by working against the mass of the person sitting and enjoying the ride.Or you could give the person just a tiny push - right when the swing starts from the highest point to go back.Could that mean it is really as simple to build as Tesla claimed?If the top mass is limited by how far it can swing FREELY before the air pressure works against this movement then we would only have to set the length of the pendulum so the contact happens right at that point on the x-axis of the top mass.Ok, and how would that make anything swing at all?If the top mass is first energised there is nothing to stop or influence the movement, except the "air springs".So it totally overshoots like those metronomes on the board.It swings back and closes the contact on the other side of the movement way early as well.Now the electromagnetic impulse from the second movement actually works against the moving top mass.And this swinging of total non-control continues while whatever the thing is mounted to also starts to move, even if it is just fractional.Over time both swings, from the machine and the object, will get to point where they influence each other in a "positive" way.For Tesla's experiment one would say negative though as it was quite violent in the end.Little by little both swing will get closer to being in sync and with that in resonance.The electromagnetic push however continues....Only that now the top mass of the machine is in sync with the thing it is mounted to.The machine became you standing behind a big swing and trying push someone higher and higher....It is all just a theory though and any minor earthquakes that might register around my area are pure coincidence ;)

Topic by Downunder35m    |  last reply


What to buy?

Hi Guys,I would like to make small wooden boxes, it's my first time would you advice which table with saw should I buy? Greets ChrisPs It should be small and not super expensive.

Topic by ChrisRydzewski    |  last reply


Want to build a automatic opening drawer? Answered

could i use a dvd tray as the actuator if it is under a light enough load? what is the max it could probably open? thanx for any help you can offer

Question by JustinJalapeno    |  last reply


Cleaning up STL files for 3D printing properly?

Every now and then I find a nice model on Thingiverse or such places that I would like to print.Quite often though these models come with errors.No clue why people upload them for 3D printing if the printing software can't print them....Anyway, there are quite a few online place that fix a model and make it watertight, remove flipped faces and more.Usually with quite good results unless the model is really crappy.What I miss though is a program or online service, preferably free of course, that can actually simplyfy a model to match a printers capabilities.For example a scanned object of just a few cm in size can come with over 100mb in file size with ease.There are programs able to modify a mesh, shrink it or even reduce the triangle count.However those usually still fail to address the problem at hand.Required details go missing and sometimes entire shapes change in important spots.A normal FDM printer comes with a 0.4mm nozzle and is capable of 0.1mm layer hieght with realitve ease.There must be program or service that utilises this properly to create new and in size reduced model.It is just a total pain to use 3 or 4 different programs to modify a simple lithopane just to get some custom text onto the stand.Same for creating multiple print jobs for it as it often results in bad adhesion.What I really would I guess is something where you enter your prefered layer height and max resolution based on nozzle size to get an optimised STL in return.I know your nagging question already: Why bother?1. If you have a STL file of less than 1mb and make some simple modifications with Blender, Meshmixer or whatever, then you can end with a file of way more than 20mb in size and with a complexity that was nowhere in the original."Fixing" a bad file with these apps is easy but again result in massive file sizes or massive loss of detail.2. Mechanics...It really makes no sense at all trying to make your printer create structures finer than 0.2mm - you just won't see it with your naked eye anyway.Especially complex, scanned objects often result in perimeters that enlarged look like someone was holding a running jack hammer while making the perimeter.In return your printer can create quite similar sounds and most importantly the print time goes up for no good reason at all.3. I just prefer simple and clean models.I want to be able to make simple adjustments to a simple object without the need for 32GB of RAM and a server tower to house several CPU's.Is there any such app or service already out there and I just missed it?

Question by Downunder35m  



Washing machine motor on an electric vehicle?

Hello, i already asked a question about a car starter as a Motor for my Electric bike project. I got bad news from the answers, so I wanna use a washing machine motor.  My question is, do i need 240V to power it? Or it has like a transformator in the washing machine that makes the voltage lower? I never opened one..

Question by dsirotic    |  last reply


Can I use 60ppi polyurethane to filter solder smoke?

I am going to make myself a little rig. Two fans with some kind of filter sandwiched in between. I was wondering if polyurethane filter would work because I saw it and it was extremely cheap. 60 ppi seems like the best filter quality I can find. Then again I don't really know what I'm talking about. If someone could explain to me why this is a bad or even a good idea that would be appreciated. Also any recommendations on anything else I should use instead. :)

Question by Inblackandwhite    |  last reply