Cinderblock - To paint or not to paint

I always had this question in my mind.  Was the cinderblock designed to breathe?  In other words do we want the moisture to go from one side to the other in case of cinderblock walls (say in the basement walls?)  Logically, I would think that the answer is that we want to prevent the moisture to go from one side to the other.  If that is the case, why the cinderblock makers do not make waterproof cinderblocks by adding water proofing chemicals during the manufacturing process? I would greatly appreciate your insights on this subject.

Topic by kabira   |  last reply


Straight line art - what is the technical name?

I remember back in 2nd, 3rd, 4th, and I believe even 5th grade, when I was in a gifted program, we had to draw. We drew only straight lines, and when we did it right, it made a curve. We would get a paper with 2 lines, connected at a vertex, at a 90 degree angle. We would draw points every centimeter or so, and connect the points, far to close, far to close. (It's hard to explain.) I'm searching for it on the Internet, but I can't seem to find the right word. Does anyone know it? Thanks, and if it turns out all good, expect an Instructable on it mid- to late October.

Topic by Bran   |  last reply


Wanted: Looking for EMPTY Nitrous Oxide Canisters

Looking for EMPTY, only empty, Nitrous Oxide canisters.. the small kind, for like airguns or whipped cream.

Topic by laminterious   |  last reply


Make use of iCamera 1000 units?

I have 3 "iCamera 1000" camera units laying around. I do not have the rest of the security system they are designed to function with, but there has to be some way to make use of them and have some fun. I have lots of cat 6 cable and RJ45 connectors to custom make a cable if anyone has the expertise to figure out how to make use of these. Before posting here, I searched and searched here and on Google but only found information regarding the "normal" application of these cameras..... I was hoping for something more outside the box which is why I am here. I included a front/back picture. Thanks for any ideas!!

Topic by PigWhistle   |  last reply


The future of "mobile" energy...

Right now our current standard is still to use LI-Ion batteries when it comes to rechargable and power demanding devices.We all want more power for our phones, laptops or battery powered tools on the job.And we also want to be able to charge our batteries faster and faster.Back in the old days a D-Cell like lead acid battery in a flashlight was good for about 3 hours until it started to dim a bit.With up to 4 batteries inside they were not just heavy but also quite hazardous.Chargin was usually done over night and you just hoped they were not blowing up while charging.I spare you the other types that came after and that we still use as they all have their good and their bad sides.If we trust our marketing experts than quite soon we will only have electric cars on our roads and battery the size of a suitcase shall be able to run your car for hundreds of miles.The ideas of graphite based batteries or those using crystals and their forming reactions are all great and promising.Some will certainly make it to the consumer in a few years.The one thing that we are never told though is where all the energy to charge those batteries is supposed to come from.Replacing the combustion engine with electric motors is one thing but if no fossil fuel is used....Energy does not come out of thin air!Right now a lot of countries already struggle to provide a reliable power supply grid and distribution network.If you ever enjoyed a scorching hot day during a blackout caused by everyone using too much electricity you know what I mean...The population is growing as fast as the energy demand for our industries.Solar and wind are well and good but without proper storage solutions of not real use because no one can really predict how much they can produce.You know, weather and such things...If we trust our so called experts than all will come together really nice.By the time we have really powerful batteries we will have enough alternative energy supply chains up and running to keep them charged.I have a few issues with this entire concept, so let's see what other people have to about this:Imagine you have a nice and big cabin somewhere really remote and beautiful - but with no electricity for miles.Obvious solution for the modern hunter or nature lover is to invest into free energy.Free because that is how your solar, battery and inverter system would be advertised.You buy the stuff and after that all the electricity comes for free - the things pays for itself!Reality is a bit off though as you need to maintain and replace the costly batteries over time and such things.All this however totally changes for a residential home.Getting a huge solar system on your roof is no problem.Getting off the grid next to impossible.You see, once (or even before) you sign up for an electricity contract it is defined that your home is in a residential area.This brings certain limitations like the requirement to connect ot gas (if available), water, sewage and electricity.Only way to enjoy your "free" energy is by getting a good deal with your supplier.Some countries do it differently but around here it goes like this:Whatever you use still comes right off the grid.That is because your solar system really struggles to cope with load changes and providing surplus back to the grid.And since your meter is not capable ofworking properly with it either...To make it "fair" it is metered how much you use and how much you supply.Most companies here even do this on at least an hourly base - just to fair...For your bill the amounts are then adjusted.What you supplied is taken off.Sadly in most cases going negativ is not an option - if you provide more than what you use only your supplier is laughing.To make things worse what you supply is valued far lower than what you get from the grid.Often the difference is above 20%.Control....Around here quite a few people basically covered house, shed, carport and all with solar panels.This was while we had a great subsidy from the government to go solar...After now over three years most of these people still struggle to get anywhere near even for their investment.Without the grants the timeframe to break even was estimated to be around 12 years - which is about the time for when you need to replace the lot anyway and start over.Some do get nice savings on their bills though but families with kids not so much...If you have little to no chance to get your investment back before you have to replace it, then it is not really that much of a good deal after all.Imagine in town with hundreds of small houses everyone would be able to get the same money back for the electricity they provide...Pay 18 cents per kWh from the grid and get 18 cents perkWh for what you supply and once you provide more than you use you get money back.The providers won't allow this to happen as it means they not just loose some money but also they would lose control.How could they justify another price hike?How could they explain the blackouts?Why should tey pay you at all... ;)If a city with enough open and unused space would decide to go solar on a huge scale and while add also add a lot wind turbines....Someone would need the electricity provided and someone need to step in for those times where demand is above supply.Here the old triangle of power goes into full swing....You see a city or town would need also need a sub station to handle the electricity and to distribute it to the town houses, shops and so on.Funny thing is that only a "provider" can do such things.Doing it privat is usually only possible in really remote areas, like big mining outposts that just have no other option than using generators or solar/wind.And in most areas a town or city is no longer allowed to be a provider of electricty - at least not in the drirect form.Buying in bulk is no problem, having your own supply system however is not in the books.Right now most, if not all the big wind and solar farms are owned and operated by energy providers.There is billionaires everyhwere who could build a solar and wind farm the size of Texas if they really wanted but they won't do it either...Starts with the land, goes over the usage rights and won't end with activists claiming how bad it all is.Means it won't happen and if it does then the energy providers get together and claim they guy might have money but does not have the right to provide energy unless he actuall starts a corresponding company and plays by their unwritten rules.Can we still dream about it though?The dream is kept alive like the fire of hope that is only a tiny amber.If you sign up for electricity you are asked if you would like to pay bit extra so your electricity comes from alternative sources.Why is that bad, after all it is green?The initial investment might be huge for a wind farm but after that it is more or less just providing mone out of thin air.You can look the cost up for the new windfarm build near you.Same for the electricity prices in that area.And also the expected output of the entire farm.Do the math and calculate how quickly they break even....Once they do it only profit but you still pay the extra to go green.A bit like the new road that came with a toll....After 5 years the motorists paid it off but 10 years later they are still being charged while the road is disintegrating...Now add electric cars and our constantly rising consumption to the mix...We can't provide the electricity ourselfs as we don't get fully paid for it, we can go off grid either.The atom as the source of electricity is being phased out slowly as well.Finally as some might say, considering the thausands of years we have to deal with the produced waste and what aftereffects the storage might bring.Our providers will keep their grip on us for as long as they can.No government will stop them as in return they wouldn't have electricity.A cold war if you like.We never cared how much fuel our cars use until the OPEC decide to limit supplies and drive the prices up.And you can see the riches especially in Saudi Arabia.For most of the big OPEC players it really does not matter anymore whether or not they have oil or not.They make the same or even more money by other means and more modern means now.After this initial shellshock we woke up and decided that for the shopping trip of the wife a small car with just 4 cylinders will do.Overcrowded cities and roads also pushed us more into thinking small.Again it took force to go further, this time by governments slowy "going green".Emmissions, greenhouse gasses, polution, particles and corbon monoxide...Sounded all godd in the ads but it meant we could no longer afford our old car or even got banned from entering the town center with it.But a lot people still can't afford a modern car that meets the standards.Once they finally got the money and car the laws change again and they need yet again a newer car.This created a huge export and recyling market and profits for other people though.And what differenc did it all make in reality?While we were forced to improve and lose money countries like the US refused for years to even consider reducing the pollution.Countries like China and Russia even increased their pollution to impossible levels.We all remember how Bejing was literally shut down for the Olympics so the athletes have a chance to survive the games...We know how the pollution or global warming problem is misused to make money.The governments get huge payouts in the form of taxes from those cars that can't meet the specs.The dealer smiles with the increased sales of cars.And again the government smiles too as they get taxes from this as well.We know it happened before and is still happening with everything realted to fossil fuels, global warming and pollution, so why would electricity be any different?Reactors and coal fired power plants are phased out with basically nothing to replace them.Solar and wind will provide and till then we keep what we really need to keep....There is no plan for what comes after coal and the atom.There is no alternative.Batteries need electricity.And providers will always be the middleman controlling both the price and the availability.So how does this actually work you might wonder...No matter who invents or produces a new device to provide electricity - there is a very limited market for them.A farmer can't buy a full size wind generator and place it on his land...But an electricity provider can buy thausands of them....And if you go bigger than ask yourself who would need a 10 or 100MW fusion generator?Providing electricity is only a viable option if you go big and if you can sell the excess with a profit margin.Leaves only our electricity providers as customers.If you don't have to care about the buying price because it will be put down one way or the other onto your customers than it is like a credit.Only difference is that once it is paid off you start to get money back!Imagine that for your bank account ;)And if you know what you sell can have a very generous profit margin because your buyer does not care then the solar or wind farm will be quite costly to build..."We know we are not cheap, but who else can deliver you what you need?"And like our big supermarkets there will be an agreement on what the wind generator can cost.Ressources....Be it wind, be it solar or just the modern electric motor in your car - they all require stuff that is very limited on our planet.Take Neodyminum.Without it we have no wind generator or fancy motors as we wouldn't have powerful enough magnets.Vital elements and mineral required are only available in a few spots on our erth in quantities justifying mining them.I won't make this much longer than it already is, so please look up what is really needed to keep our future solow and wind projects alive.Then go and check where we can find thes things in good quantities.Once you did you might realise why the world tolerates the abuse of human rights, freedom or just self expression in other countries ;)If only China would stop today to export and sell their rare earths and prcious minerals basically our entire production worldwide would suffer quickly.Entire industries break down quickly and prices for certain things would literally explode.The US already started to re-open long abandoned mining projects as suddenly even the most costly operations become viable again.Think about this next time you fancy a world free of cars and truck using combustion engines ;)

Topic by Downunder35m   |  last reply


Diy o-ring with glue-gun

For emergencies, but not only: make your own o-ring. use a hot glue gun and some soft glue-stick. look for a round object more or less the size of the o-ring you need. form a steady bead of hot glue around it. wait for it to set. peel it off. if necessary: smoothen down the edges somehow (sanding-paper, file, etc). feedback appreciated. thank you.

Topic by la xerra   |  last reply


RGB Led doesn't mix colors

Hey all I am working with common anode RGB LED. I hooked each leg (red, green, blue) to pins 2-4 of my Arduino UNO. I then hooked the anode to 5v via a 22 ohm resistor. The code I wrote was very simple; turn pins 2 through 4 low, delay 500, turn pins 2-4 high. The problem I found was that instead of the color turning white it stayed red. I tried mixing red with green and red with blue, each time same thing it stayed red. Does this sound right?

Topic by Mpc1055   |  last reply


A helmet of Assassin's creed's alexios

I am a fan of Assassins and want to make a Assassin's creed character alexios helmetHere it is

Topic by nischayajoon 


What kinds of contests do YOU want to see on Instructables?

Hi everyone! As we're planning contests for the next year, we wanted to get suggestions and feedback on the types of contests we're running. :DIs there a contest we ran years ago you'd like to see again? Any contests you're sick of? A weekly challenge you'd like us to expand on? Do you want the contests to be more specific or more open ended?We're trying to shake things up in contest-land - so any and all suggestions are welcome! I'm especially interested in what types of tech contests you guys would like to see, as well as ideas for food contests. P.S. For anyone wondering about weekly challenges - we're still trying to figure out a way to do it that makes it easy for you guys to enter and easy for the editors here to run. But I promise we are discussing it! :)Have prize suggestions? Check this topic. Want to get a preview of some of our upcoming contests?

Topic by randofo   |  last reply


How do i disable an auto clip limiter?

I have an eb7500pro rack mountable amp running 1800 watts rms in bridge mode and i cant get the amp to turn up to clipping i would like to. i know your not suppose to clip the amps i know all the possible dangers when entering clipping zone. when i turn up the amp to about half 1over4 of the way up and the volume decreases. and when j turn it down the volume kicks back in. when that clip light emits it turns down the volume I know because i play a constant hz tone and slowly turn it up and it turns itself down how do i stop that?

Topic by samhenderson156   |  last reply


May 2019 site changes: my observations and thoughts

In early May 2019, Instructables' website has been radically reworked with a revamp. Changes I have observed include:Navigation: Many categories and subcategories have been eliminated and instead reworked under other folders as part of the changes (there is no "Play" category and subcategories such as "NERF" and "Paper Airplanes" no longer exist) "Recent" filtering is not directly available to people browsing the site--you must sift through the categories and get through at least two pages to find a way to filter the selected category for "recent" (i.e. Homepage -> Circuits -> Projects -> (Page at which you may select "recent"))There are no filters for searches On the front page and in the categories' main pages, featured projects are emphasizedThe Forum/"Community": Without manually typing in the URL, there is no direct way to access the "community" page Buttons to access the forum among in the category pages are tied to the community pages for that category (as a result. They do not allow you to see the general forum posts of the community without viewers manually deleting the category from the URL and going from thereThe way people navigate about sites controls what they can see and how they see if, so all of these things will change the flow and behavior of Instructables' viewers versus how it was before. Versus before, it is more cumbersome for viewers to get to recent content while featured content is more readily available. This will influence where people go and what they see.----------------------------------What do I believe this means for the future?Drawing on my decade of experience on this site, I suspect viewership of non-featured Instructables will drop. Thus, the viewership gap--between those projects that have been featured and those that have not think--will then widen.Of these changes I think people will say you either "get featured or get buried."

Topic by OrigamiAirEnforcer   |  last reply


Project-Based Learning (PBL) Resources

I'm always inspired by the awesome, in-depth projects teachers are doing with students in different grade levels. From animal research projects in second grade to designing 3D models of Jamestown in Tinkercad with fifth graders or CubeSat projects in High School. There's so much we can learn about PBL from each other! :)What are your "Go To" projects that you do with your students? Any tips for managing class projects and grading (rubrics or scales, etc.)? What about finding materials/resources for projects? My best resource for cardboard was the school cafeteria. :D

Topic by WeTeachThemSTEM 


Archery Load Cell Circuit

I'm looking into a system that will enable me to determine the distribution of load on an archer's draw hand grip, probably as a percentage of the whole load. I have some basic ideas drafted, but before I start re-inventing the wheel, has anyone anything similar set up that I could look at or consider developing.The sensors/load cells must be able to fit between the two layers of a standard archery tab. There must be three sensors, for the three fingers of a normal "hook" grip, and I think either an Arduino or Pi based processor.

Topic by Warleyman   |  last reply


coin modifying laws?

So my friends and I are planning to sell, well...things (I'm not going to give out any details as of now, later) that incorporate small round metal disks. now in all of our prototypes weve used coins for our purposes and they work great. but for what we make we need to cut and sand coins in different ways. and my friends always tell me "its illegal to change money in any way." But I've heard that its only illegal to modify money to change or duplicate the amount its worth - like making a penny into a dime is illegal but making a penny pac man figure isnt. can anyone clarify this for me? I'm fine doing illegal things like modifying coins for personal use but if were going to sell these I want to be a little more clear as to what is going on.

Topic by berky93   |  last reply


MAGIC BOX pyrotechnics !! ?? lol

I would love to invite you guys to my brainstorm! I need help hahahah. I want to make a box that opens and has sparklers go off, maybe some fog via a smoke bomb? Lights... hahahah. I want this box to perform. I am going to give this to my friend with the gift inside, so I can imagine having little pointers like "light here" etc. I've tried to google this, but I am not finding any crazy magic boxes that do things kinda dangerous like this lol. Have you seen one, have you seen similar installations? My goal is to figure out the best way, and do an instructable on it, how I manage to orchestrate it. Any tips, pointers, experience would be amazing! This box will end up shoe-box size or smaller, and I may line it with aluminum to deflect the sparklers and reflect the light LOL. :D Thanks in advance! <3

Topic by kristylynn84   |  last reply


Roomba and Central Vac

I really don't like cleaning my house but I don't want to live in a garbage house.  I'd like to have a floor cleaning system.  For carpeted areas, I envision the that the system would use a Roomba and dock to a central vac system so that I wouldn't have to empty the Roomba.  For the non-carpeted areas, I'd like to use a Scooba that connects to water and sewer.  What are your thoughts?

Topic by sundet   |  last reply


School Project - Arduino Personal Locator Beacon

Hi All, I'm currently in Year 12, undertaking my major design project.I have chosen to design and produce an emergency survival kit that comes with an in-built personal locator beacon. The personal locator beacon must have the capability of transmitting geolocation data to emergency services for atleast 72 hours. It must be able to work in remote areas.I have purchased a range of parts in order to help create this project, of which, I will list below.- Arduino Uno r3 Development Board- Arduino compatible Long Range LoRa Shield- Arduino Compatible GPS Receiver Module- 2600mAg Metallic Power Bank- 5/5.8GHz 5dBi Wireless Networking AntennaI have been experimenting with Ardunio & Components for a while and now understand the basics. I have managed to get the GPS module to work and receive geolocation data. However, I have only been able to do this when the Arduino is plugged in and powered by a computer. For my project, I need to be able to send geolocation data to a specific source, whilst on the go, in remote areas.I plan to power my components by using a portable power pack (similar to a portable phone charger), however, I am unsure of how to program the gps module to send geolocation data to the long range shield, which will then send the geolcationd data to emergency services (it can be a proof of concept but it needs to be communicated to something such as a cell phone or a radio frequency).I would really appreciate any advice or information that can help me develop this project or point me in the right direction. Kind Regards,Adam

Topic by awsomeclone2218   |  last reply


Not able to open drafts.

Hi Team,I am unable to open drafts. Clicking on profile pic, its shows drafts, but nothing gets showed up once I click on it.Please help resolving this.Regards,Vineet

Topic by IoT Cloud Guru   |  last reply


Author Spotlight Interviews: Nominate an author!

We recently began a new round of author spotlight interviews. For the first interview, we chose to reach out and chat with Nikus, who recently won the grand prize in this year's Epilog Contest. You can check out our interview here: Author Spotlight: NikusThese interviews are a great way to learn a little more about individual contributing authors here on Instructables, and see what makes them tick! Is there someone who is an active author that you'd be interested in learning more about? Now's your chance to nominate a fellow author. There are no set requirements to be eligible to be nominated. But generally, we're looking for authors who've shared a good handful of high-quality projects, which made a notable splash within the Instructables community.And yes, if you're feeling bold, you may certainly nominate yourself! : )

Topic by seamster   |  last reply


D.i.y. (plastic) nuts (for any kind of thread)

For emergencies or simple application: how to make your own nuts out of (p.e.t.)-plastic bottles:take a bottle (#1 plastic, preferably smooth, w/o imprinted patterns or design etc) > cut off bottom and neck > start cutting (scissors) > the resulting ´tube´ into a consistent (width, depending on desired usage), slightly diagonally, thus sort of ´peeling´ it > wrap the strip around the screw/threaded-part/etc you need the nut for twice (for a start) > ´melt´ the edges of the wrapped part = joining them (i use a little solder-iron) > this way the wrapped beginning of the strip wont come loose > ´brush´ with the solder-iron (or whatever other source of heat) over the wrapped part (w/o) burning holes in it > this causes the plastic to shrink and press down into the thread and adopt its shape > once set keep doing more wraps of the rest of the strip until you reach a desired diameter > now, again, join the edges of the wrap with heat, and afterwards brush again over the outside of the created ´nut´, so that the plastic shrinks down & compacts > after having cooled off: unscrew the ´nut´ with pliers > ready for useps this is just a simple sketch. got no camera to take photos. sorry. so, please, ask whatever if you got any question. and any kind of feedback is more than welcome. bowing.

Topic by la xerra   |  last reply


3D printed combination lock anyone?

I am in the finnishing stages for a fully 3D printed dial combination lock, similar to what would be used on a safe.Unlike what you might find in other places there is no metal parts.No crappy amount of possible combinations either, 72 per dial dial...I took me a few weeks and quite some filament to get from a draft in Sketchup to something that actually works as planned.As it was more a training excersize in Sketchup for me I had the the following goals:1. Everything is 3D printed with as little afterwork as possible.2. All required springs are 3D printed as well as all other moving or stationary parts.3. Where otherwise fasteners or screws would be required only short leftovers of filament are used to keep the parts in place.Only exception for security reason is the mounts for the front dial and holder.These should be glued or screwed in place if the actual intention is to use it as a working lock.4. The lock shall not be pickable by means of felling, hearing or just trying out random combinations.The above points I got sorted to my satisfaction.However I would like some feedback from trustworth beta testers on the general design and functionality.It is one thing to design something that just works but a bit harder to design it the best possible way.Another big drawback currently is that it seems to be impossible to export proper STL files in Sketchup once they reach a certain complexity.Automatic services or programs to fix these issues result in drastically increased file sizes.Some of the problematic part go from just under 200kb to over 10mb after "fixed".This is not acceptable for me and I have to work on fixing this issue.Most slicers correct these tiny errors automatically and produce a correct print but I prefer proper STL files of small size and complexity over inflated ones that I then need to double check for a long anyways.A few details need changing as my tests showed that you can't drive up print details to a certain level without risking to be unable to mount the parts without further sanding.I hope to have a full set of clean STL files ready for testing by the end of this month.If you are interested to try it out and maybe contribute to an improved version your time will be valued by being mentioned as a beta tester for the upcoming Instructable.Be warned though!This is not for the faint of heart and certainly not for someone who does not know how to calibrate all aspects of the 3D printer involved.The lock also uses quite a bit of filament, currently around 37m all up but I am working on reducing this by replacing solid parts with framework instead where possible.The assembly can be time consuming and frustrating if you realise only once finnished that you have certain parts in the wrong position or orientation.But as said, my goals were not really on making it as easy as possible LOLWhy desing a lock that is neither secure enough nor free of metal parts if there is other options ;)If you happen to work with an Inventor and PLA on the left side then I can provide ready to go .gx files if prefered.They would then be already confirmed to be working and usable on one of my printers.Let me know what you think ...

Topic by Downunder35m   |  last reply


How much water is in my cistern?

I built a 33 gallon cistern my garage to collect condensate from my HVAC system. (I didn't have room outside my condo for a rain barrel). It has a spigot and a short hose, it lives above my utility sink, which is where the overflow goes when the cistern is full. I'm hoping some clever makers can give me some ideas on how I can build something that will tell me how much water is in the cistern. I have Samsung SmartThings so I've considered putting a water sensor just below the overflow hole, so I will know when it's at 100%, but I would prefer to have a percentage reading and an alarm when it gets to 90% or so. I considered an arduino with an ultrasonic sensor but that a bit involved... Not opposed to it but please be prepared to hold my hand thru the process of you propose it! ☺. Non-SmartThings solutions also welcome.Thank you - looking forward to your genius ideas!!Mark

Topic by MarkB673   |  last reply


Tips and tricks for UV curing glue, resin and coatings

Only a few years ago your only option to repair certain plastics, glass or even a broken crystal was epoxy based resin or the good old superglue.You might have already tried one of the 5-seconds-repair pens or tried your own UV curing nail polish art at home.For the later you might be lucky as the resins used here are optimised for the purpose and lights you get with them.Sadly even the best nail polish is no substitude for a glue as the material properties need to be different.One of the most common complaints when it comes to using some UV glue, like Kafuter or similar is that it never comes with instructions.Sould be straight forward but it is not free of problems.For example almost all commercail UV curing glues that you can buy require quite stirct procedures and for the light the right wavelenth(s).Resins and coatings can be even more painful here as they might also require you to stick to the correct temperature.Let's start with one thing you might have encountered already...The glue is definately cured and rock hard but the surface tacky and smeary.Quite annoying if you want to fix a piece of jewellery and can't prevent it from collecting dirt and dust...The next thing you might have encountered is that despite having transparent materials it seems to be impossible to cure the clue.Both problems come down to wavelenght and exposure.UV curing glue is prevented from curing in the presence of oxygen - a factor utilised for example in resin based 3D printers.Uncovered glue is exposed to the oxygen in the air and won't cure easy.The glue or resin below this layer however with fully cure with ease in the absence of oxygen.For the second problem consider that not all materials that you can see through will let UVC light pass through ;)Bonding strenght is another complaint I hear a lot...Be aware that certain things just are no good for UV curing glues or resins.Take the molds you get for that purpose: on the material the glue won't bond!Teflon is another prime candidate here.But in a lot of cases it comes down to surface preparation.Don't be afriad to sand the surface!Not only will the surface area increase but the scratch marks will be invisible once filled anyways.Use sandpaper on your fingernails, then go over with clear nail polish -mirror finish ;)With curing often a problem consider to fully cover the glue.A bit of clear sticky tape, food wrapping foil....If that is not an option then eliminate the oxygen.You can use a container filled with inert (for the glue) gas like CO2 or just place a burning candle in it until it goes out....Either way the amount of oxygen should then be low enough to cure the surface of your glue.Not always is any of the above an option.Then you can still try more power and a lover wavelength.Mercury based lamps for example provide a very broad and powerful light that in most cases will cure within seconds.For a proper surface cure you need a wavelength of 265nm or lower.LED's offering this exist but at prices well out of range for the hobby user.A mercury lamp under high pressure is nothing for short term use and the limited lifespan does not always justify the costs of buying them.Like with most things in life certain inventions can have a dual purpose.Quality germicidal lamp systems for examples often state to go as low or even lower than 265nm.And they come at a fraction of the cost you have with a broadband mercury lamp.Even cheaper is the fre weather forecast.If the sun is siad to be strong enough so you need protection than even the worst glue will fully cure in seconds outside in the sun - tackfree!Don't be fooled and protect yourself!!These tiny LED lamps for your glue stick, the curing thingies for your nailpolish and everything else using UV light comes with warnings.For very good reasons!It might be hidden in the fineprint but you can not really see UV light.The blueish-purple glow you see is on the high end of what comes out and by that in the visible range of your eye.Just because a LED only gives a faint glow you see does not mean the UV light wouldn blind you if you could see it!Even worse for fluoroscent lamps or open cruning systems like those for your nailpolish.Reflected UV light is still UV light and you can still NOT see it!Stories of people getting sunburnt from germicidal lamps in a butcher shop or other people going blind from checking money as their living have a true base...In most cases lamps used well past their lifespan or simply the wrong type of lamp but still: the damage came from UVC light...If you just love creating your own artwork or jewellery with UV curing resins and glues than protect yourself.Proper sunglasses with a stated UV protection for example or just black nitrile gloves for your hands...

Topic by Downunder35m 


Rewinding a DC motor for different voltages

I modified small DC motors, like used in toys and such but now I have one that requires to do it properly.Motor in question runs on 24V and uses about 3.5A under full load.Drives a high pressure water pump on either side of the shaft.The rotor is basically empty with just a few turns of wire and lots of empty space.I assume the same model is used for multiple power configurations by the manufacturer.For the toys my basic approach was to just calculated the number of turns or to count them when removing.From there I get the voltage per turn and can rewind accordingly.So in theory and by blissfully ignoring all higher things involved I could do this motor the same way.Right now I see 10 windings per coil, so with thicker wire I would use 5 to run it on 12V at roughly the same speed.Only problem is that thing then would use around 7.5 to 8A when running under full load and get quite hot.I need the speed to keep the flowrate at the same 7.5L per minute but I also need the power to be able to still get the 120PSI from just 12V.Isn't there any winding trickery that would allow me to reduce the required current a bit without sacrificing on speed or torque?

Topic by Downunder35m   |  last reply


Teacher Account

Hello, I am a teacher at Stuart Hall School. I would like a pro membership so I can utilize all these great projects in classroom. I teach at a private school so my email does not end in edu. Here is the our website: http://www.stuarthallschool.org/ Thank you!

Topic by kgcarini   |  last reply


InVision LD 3D Printer Help

A 3D printer has been donated to my classroom for a few months, but we were not given any documentation on the printers use. I have looked online, but it is an older 3D printer and information is lacking. I thought I would see if anyone here had experience and could point me in the right direction. I have been to manufacturer's website but have had little luck since it is a legacy system. I have looked online but I cannot find a manual. If I could find a manual that would help greatly. It is an InVision LD 3D Printer, S/N 05JA1921 Thanks!

Topic by ehudwill   |  last reply


xbox 360 gamertags.

Hi instructables. I just wanted this to be a forum so we can get to know each other's xbox 360 gamertags. Pls. post yours. P.s. mines is Y3ahWhat3v3r P.P.S. I'll send you all friend requests if you want.

Topic by SeMi_AuToMaTic   |  last reply


Site update?

What happened to the instructables site? I can't find anything, no "recent" "featured" "topics" or "question" good luck finding this post. Is it an update or does my computer just hate me?

Topic by liquidhandwash   |  last reply


What is the most affordable laser cutter for a beginner?

I really would love to try out laser cutting. ..But have no idea what knowledge it requires. I want to be able to design and cut custom wooden puzzle, laser cut fabric and also to cut felt and foam. I would like to start up a small home business. Keeping in mind that I have no clue what knowledge it requires and also know that I have 4 kids and will have to have this machine in my home. I do own a silhouette cameo but unfortunately it does not cut felt or wood. It’s a fun machine for cardstock and all…but nothing heavy duty. So is it safe to have a laser cutter at home with kids?? I mean will the light or whatever that comes off the machine be harmful for my children? Also how much is the cheapest desktop version? Will it be able to cut large fabric? Can it cut 0.5” or 0.75” hard wood?? Would that be pushing my luck?? Please let me know…so I can start saving up for it. I really really love crafting….but availability of items and affordability is a big issue. Thanks!

Topic by shazni   |  last reply


"I dont know but iv been told":Calling Cadence

My soccer team dose lots of running and we'v been trying to find some of the: I dono what iv been told lines, the ones the armed forces sing when they run in a group (at least i think they do but i have no exspirance). the lead runner says "I dont but iv been told" a response from the rest of the group would be "the sun shines bright but im still cold" so if you know one or two lines please just comment and ill put them up for me and any one elce that needs verses. or if you find a websight that has lists of lines please post a link (yes i have googled it and no didnt find any)

Topic by i make shooting things   |  last reply


Why these relay issues?

In my PCB ,AC voltage is passes under the relays(R).. relays too become heat up.

Topic by sforsajith   |  last reply


Hack Needed: Rechargeable Halogen Spotlight

Greetings all, I'm in need of a hack to replace the lead acid battery in a rechargeable halogen spotlight purchased at a local store. The spotlight came with a AC recharger but 15 charge time hours returns only approximately twenty minutes of usable light. I'd much like to replace the power source with something of a longer duration than the current one third of an hour. As much interested in simply rewiring the device to work from my car's AC outlet if possible. Mind I only have a few dollars invested in this device still I'd like to see if a replacement power source is worth the effort. Thanks to all who reply.http://ledmuseum.candlepower.us/third/fixit.htm

Topic by patron_zero   |  last reply


Be your mechanic

Hello to all the magnanimousStudent professors and those who work in their own businesses Do not be tired of your loved ones. My name is Amir 48 years old and I have almost 32 years of experience in mechanical testing of cars in Tehran. I'm very interested in electronics and I repair almost 70% of my belongings But I did not attend classes in any classroom that I learned early. I'm glad to be among you I'm also happy to be in touch with mechanical questions Thank you

Topic by aryyyya1349   |  last reply


What kind of repetitive elements can you use on a surface with a gluing material inbetween to decorate it and look luxurious?

What kind of materials/repetitive elements/items can you use on a surface with a gluing material inbetween to decorate it and look luxurious?Check my pinterest folder, I want to make a parametric/curved wall ( https://i.pinimg.com/564x/34/e4/04/34e4045e39debc... ) and put plaster on it and some bounding agent to attach the repetitive elements https://i.pinimg.com/564x/34/e4/04/34e4045e39debc... what can I use?

Topic by DIAGONALLIS   |  last reply


Help! -I need a timed cigarette dispenser - seriously

Have tried everything to give up smoking and failed, so a neighbor offered to give me 1 cigarette every 4 hours so I can cut back. Now she is going out of town and I really need a machine to do this job. Can anyone come up with a relatively inexpensive machine that can be built by an amateur like me? I would be grateful for any help.

Topic by diane4m   |  last reply


Attach Pasta Maker to Kitchen Aid Mixer

Can someone come Up with an easy tutorial on Attaching a Pasta Maker to Kitchen Aid Mixer ? The Pasta Maker has a Manual Cranking Handle. I have seen Kitchen Aids with the attachment and would like to convert mine.

Topic by TheCritic   |  last reply


Equalizer for phono input to amp

Circuit for converting an MP3 player output to input for a phono input on an amp.

Topic by knorrisster   |  last reply


Need Help in Building DIY LiFePo4 battery pack

Hello all, my wishes to everyoneam very new to this Electrical, Batteries and DIY, with the help of google i can gained little knowledge with that i could able to gather products to build my own electric scooter (1500W 60V HUb Motor and 60-72V regenerative controller with Daly LiFePO4 60V 45A Comm BMSactually am planning to Build 60V 36Ah LiFePO4 Battery Pack Using 19S6PBattery : LiFePO4 32650 3.2V 6Ah BMS : Daly LiFePO4 60V 45A Comm BMS Controller : 60-72V 1500W 35A am confused when times comes to assemble the battery pack, pls help and guide me with appropriate diagram or chart for 19S6P pack, help me how to connect batteries in series and parallel along with BMS so that i can build my first battery pack with out no mistakes Do i have use capacitors while connecting batteries, if so provide me the type already bought the battery tab spot welder from my friend for reference i have attached pictures of the products i mentioned and bought already please don't mind if i asked too much help/suggestions, want to make my own DIY battery pack by learning ad gather information about battery pack and build one one in perfect way Thanks in Advance

Topic by tejeyes 


Not Able to Get to Drafts - Help!

Hey all, I haven't been able to access my draft 'Ibles for a few weeks. Whenever I click on the "Drafts" link it takes me to the Instructables home page. I can see all of the ones I have published, but as soon as I try to flip to drafts it redirects me away.I was able to finish up and publish my last project by finding the Editor page in my browser history, but I can't do that for other ones that I haven't opened since I got a new computer.Is this a bug that's been going around or is there a different way I should be accessing the drafts?I appreciate the help!

Topic by BakkerJo   |  last reply


How different is the tenor sax and the bari sax from an Alto saxaphone?

So, school starts soon obviously, and I am taking band. I currently am playing alto sax, and I am wondering if I should try to play tenor, bari and alto sax. However, I want to know what some main differences are, so if you play bari or tenor sax, I would appreciate any information. Thank you.

Topic by Rock Soldier   |  last reply


Home Page Images

The images for "Explore Projects" on the home page never seem to change. Repeat viewers could be excused for thinking that nothing has changed on Instructables between visits.How hard would it be to update the images on a daily basis ... using perhaps a random function?PS: This post is likely to be missed by viewers in other "Categories" and "Channels" as the posting options are too restrictive.

Topic by lingib 


Unable to view comments

I'm unable to look at my list of comments - if I click on ...https://www.instructables.com/member/Kiteman/discu......I get sent back to the front page.Anybody else?

Topic by Kiteman   |  last reply


Can't access my Inbox on Instrucables

Is anyone else having issues accessing their inbox on the site? Every time I try to open it it takes me back to the home page. The issues been happening for awhile now.Anyone know a fix or how I can get into it?Cheers

Topic by lonesoulsurfer   |  last reply


Wordless how- to videos.

Https://m.youtube.com/watch?v=r0oX4I11BMc This is not my video, but I thought it was pretty cool. I really like some of these wordless how to videos. I suppose that it assumes a certain familiarity with the processes from anyone who would do these projects. Yet, if you don't have a familiarity with welding for instance, you probably wouldn't do this project anyway. Any other good videos like this one?

Topic by Toga_Dan   |  last reply


Driving Simulator - Google maps

A perspective version of 2D Driving Simulator on Google Maps work-in-progress, using new Map3D class of Google Maps API for Flash.http://geoquake.jp/en/webgame/DrivingSimulatorPerspective/(choice of car or bus)

Topic by lemonie   |  last reply


Calculating my DC motor

I'm not sure on how to calculate the things I need. Please help!!!!Pulley Radius- 5.85mmMass(load)- 0.2334 kgVolts- 9VCurrent- 0.096ASpeed-112.4rpmForce-?Torque-? Power-?Power Out -?Efficiency- ?

Topic by hj212121   |  last reply


High efficiency coilgun design

Hello there I need some (a lot of) help with my project. I've started to design a high efficiency multistage coilgun. The main feature of the design is using the self-inductance formed in coils that were shut down for accelerating the following coils. To perform this, we can divide each coil into 3 segments (lets call them subcoils), connected with a wire and power all them 3 with a single capacitor. At first, the current from the capacitor is flowing through all 3 segments and a projectile is being pushed through the first segment. Than the first sensor is being activated with the projectile and it switches the power flow to only second and third subcolis As the current in the first subcoil is changed, the self-inductance directed in the opposite direction is appearing. In theory, we can use this power to increase the current in the following segments. The same thing is happening between second and third segments. And I want to place 3 of this stages (9 subcoils in total) I will use 8mm caliber projectiles, 40mm or 50mm length. I chose 5200mkF 450V or 6800mkF 400V capacitors, 2 of them in parallel for every stage (6 capacitors in total) Yes, I know it sounds way too powerful, but that's my actual goal. It's not my own idea. I have learned it from here http://gauss2k.narod.ru/adf/gs3seg.htm (русские вперёд). So, some problems had appeared. I can't figure out how to properly calculate the required inductance of the coils. In the source it is said that the inductance of the first subcoil should be equal to two of the second and the third subcoils (L1=2*L2=2*L3) to achieve the best performance. Also, my rough estimates show that peak current through the coil will be about 1,5-2,0kA for 3,0-4,5ms. This is quite a lot! I'll have to manage this energy and choose the power switches rightly. To sum up, I will be glad to hear your opinions about this idea. It's kind of controversial, but I hope it's not a certain failure.

Topic by CosmoKnight   |  last reply


Call for contest judges

Hi everyone! You might have noticed we're running tons of contests these days. We need judges more than ever to make sure our contests keep running smoothly and fairly! The judging process is fairly simple and normally involves looking at contest finalists and rating them on a scale from 1-9. Judging is typically open Friday afternoon through Monday night, though some of the larger contests have judging that runs for a week. Time spent judging is around 30 minutes to two hours - it all depends on how thorough you are! If it’s not a good time for you to judge when we contact you, no worries. We always try to assign more judges than we need in case something comes up. You can find out more about judging a contest here. Don't worry!  Judges are selected after finalists are selected, so volunteering to judge will not affect your chances of being a finalist in any contest you enter. To be eligible to judge, you must have posted at least ONE instructable. Let us know which contest categories you're interested to judge in the comments below: Food Living > includes Home and Craft; so please just say Living if you are interested in either or both of these. Workshop Outdoor Tech Play NOTES: If you are interested in Halloween we'll pick judges based on categories/entries we get in the contests. Costume > Living   Decor > Play, Outdoor, and/or Workshop  Prop > Living and/or Play   Food > Food   Things will depend on what types of finalists we end up with. For example: If we were to have a lot of Tech finalists in Decor, then we would pick judges from that category as well to judge that contest. If you list categories you want to judge, but also say you would judge any, it gets a little confusing. Please try to either pick categories OR say any contest.  Thanks for helping us keep the site awesome!

Topic by jessyratfink   |  last reply


Recommendations on propellers/controller for over 100g body.

Hello everyone,I am currently trying to build a DIY drone. I have never involved myself in any sort of creating drones. My current project is about making a drone with a morphing body we created. Previously, we just purchased a pre-made drone and took apart all the necessary components and re-attached all onto the morphing body. But the drone we used is this model : Holy Stone HS170 Predator Mini RC Helicopter Drone 2.4Ghz 6-Axis Gyro 4 Channels Quadcopter Good Choice for Drone TrainingThis product can make things fly when the weight is over 30~50g. Would you be able to recommend some products or any sources that can be useful for building a DIY drone? Thank you!

Topic by melonmelon11   |  last reply


Diy kinda mCable/HD elite cable

Hello, I would like to make my own mCable / HDElite cable. Basically I don't care about getting a cable, but I wanna find out how to grab a source, apply a "filter" to it and send it to the tv/monitor. I don't want to try a capture card, if they can make a cable, I'm sure we can do something cool. I was searching on raspberry pi, but there's too much lag with a capture card. Any help/clue ? Thanks!

Topic by DonovanL2   |  last reply