what are the different grades of helium?

How do the different grades affect lift capacity?

Question by glnpar   |  last reply



difference between these rotary shears? Answered

Hello, I want to buy some rotary shears. I can find two different designs. Is there any difference in the performance of these two types ( I know that one has a guide bar for cutting straight edges )  ? Thanks

Question by FriendOfHumanity   |  last reply


Replacing capacitors with different rating? Answered

Hi! I am trying to repair a computer monitor....it has 2 capacitors that are blown. I have a replacement for the first one, but not for the second one.... My question: On the capacitor it says 330μF 25V, can I replace it with another type of capacitor? Wich number is important, the "μF" or the "V"?

Question by Fypsigon   |  last reply


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


What are the different types of spray paint?

What are the different types of spray paint. Im planning to paint my old laptop

Question by setsuna   |  last reply


Different grinders of the Dremel. What to use? Answered

I use a dremel-clone. It has a set of grinders of three colors: blue, red-orange, and pink, the three in the same set. I can't see differences in hardness, but it must be differents, so... Can you help me in what color use in which task? Thank for your time!

Question by infob   |  last reply


What is the difference of a taser to a stun gun?

I think people would easily say the difference is that a taser shoot projectiles and shock them. I dont think that is it. I heard the difference is that a stun gun is a "pain complaince weapon" and that a taser is a "immobilizing weapon". Stun gun hurts and tasers make you immobilized. How does a taser achieve that? It shoots 2 projectiles and the body acts like a condutor trying to pass that current. If you use a stun gun the 2 electrodes are too close so the current need to pass only a small amount of your body. That is what I think, can anyone confirm that? I think that is why it only hurts. What if I took a stun gun and made the electodes to be very far apart?  Like take two wire and make a person hold in each hand a wire, then I would turn the stun gun on.  Would that work like a taser? So the current passes the whole body and not only a tiny spot. I hope it makes sense to someone. Thank you

Topic by a408228   |  last reply





Differents polishers in Dremel set. What to use? Answered

I use a Dremel-clone, and it has two kind of polishers; the white felt ones and this two other type: Looks like hard rubber, and I used it to burnish steel to clean some grinding marks. It works, but I'm not sure: 1 - Must I use the  polishing powder like with the felt ones? 2 - Why they have two colors, green and blue? Have they different hardness? Thanks for your time!

Question by infob   |  last reply


what is the difference between trade mark and copyright? Answered

Title says the first question but also i want to know where and what i would do to establish a company name and also where i could get a patent and what a patent protects you from in terms of copying because i have a very broad motorized skateboard idea and want to know if its even worth getting it patented since there would be tons of ways to probably get around it 

Question by BIGHAIRYDUDE   |  last reply


Would different angles on blades of propeller reduce Speed? Answered

The goal is to reduce speed of my Egg drop contraption but still spinning to keep it accurate.? Basicly its this. 8 blades on a octagon frame then String and then my shock absorbing egg carrier. What way would I want to set my Blades so that it doesn't speed through the air?

Question by noobiefied   |  last reply


Difference between all the X,Y and Z axes?

Hello, I am new here and only registered to get access to a CNC build which I really like. Now m questions is, as I look at so many of the builds, what defines the axis? Some use Z to go up and down, others mentioned it being the Y-axis, even saw a few saying X. Is it up to the builder or up to the software? Kind regards, Red

Topic by redmarien   |  last reply



How to wire up same lights with 3 different switches? Answered

It might sound weird, but I have a van with 3 different doors, 2 x sliding ones & rear barn ones.... So what Id like to do is install some super bright LED lights on the inside roof, but have a separate switch available at each entry door if that makes sense? I know you can have a 2-way hallway switch with domestic lights, but not sure how a 3 way install would be made? Thanks heaps :)

Question by smokie1969   |  last reply


I will ride a different bike every day for five days... Starting Monday.

I am going to ride a different bike to school every day for 5 days, starting Monday. Monday I will take Phoenix, Tuesday: Tiny, Wednesday: my automatic shifting(unnamed at the moment), Thursday: Telegraph, Friday, road bike(unnamed) So watch this topic, as I will be posting descriptions of the bikes, and I will tell how it goes. Soon,(I hope) I will fix all my bikes so I can ride a different bike every day for 12-14 days!!

Topic by extremegtafan   |  last reply


Does anyone know of a way to make a paper hole punch in different shapes? Answered

I would like to be able to make some paper hole punches (like a tool used to make holes for paper that will go in a binder), but in different shapes and sizes. I know they would have to be in metal in order to cut paper, but I'm not sure where to start. I understand one can buy paper punches in various shapes, but they are usually expensive and you're limited to what size and shape the manufacturers "think" you want. I also don't want to go with a custom built paper punch, as they are expensive. Any ideas on how to go about making one?

Question by canucksgirl   |  last reply


can someone explain me why some crystals have different shape ?

I'm a french student (15 years old )and for my final exam of this year I have to make a presentation about the crystalisation. So I'm asking for help to know why some crytals have diferents shapes ?

Topic by julien-fr   |  last reply




What is the difference between an in line 6 car engine and a v6 car engine in terms of performance? Answered

I currently own a 1989 Mercedes 260 e series and it has a in line 6 engine under the hood. I was wondering what the difference between an in line 6 and a v6 are in terms of performance like efficiency and horsepower.

Question by bobert610   |  last reply


What is the difference between an NGK BPR-6ES spark plug and a NGK BP-6ES spark plug?

I need to replace a spark plug that is a NGK BPR_6ES and the only replacement i have is a NGK BP-6ES.Will it be suitable for a small honda motor on a davey pump.

Question by legend4930   |  last reply


if i put holes in a guitar and if i play it holding a combination of holes shut will different sounds emerge? Answered

I need to know this for my upcoming project that combines holes like in a flute and strings like in a guitar. thanks!!

Question by sky0   |  last reply


Is there any danger in using two different sine-wave inverters (UPS) to provide backup power for my computers?

I'm concerned that having two UPS units in close proximity could be the same as having two out of phase mains supplies and the potential for a rather nasty shock.  Or, are my fears misguided? Thanks.

Question by marto26   |  last reply


Carburator swap? Answered

I was wondering if it would be possible to put a different era carburetor on a 1952 Briggs and Stratton model N? The current carburetor is shot and don't want to shell out $100 for a NOS carburetor. So my thought was putting a different era carburetor on it but din't know if it would would work or if it is a good idea?

Question by Ghost Wolf   |  last reply


Self-cycling & Filtering Water system for science project?

I am doing a science project to test the difference in number of suds between different types of foam sponges and nylon loofahs. At my booth, I would like to demonstrate the difference in suds by having water available and adding soap. My question is: Does anyone know of a way that I can build a system that would allow me to dump and filter/recycle the soap water into clean water so that do not have to keep running to the bathroom to get fresh water? Any help is appreciated!  Thank you!!

Question by donotfreeze   |  last reply


Any thoughts on what I can do with 30 (approx) 12"x12" stamped metal tiles(different colors, styles)? Answered

There aren't enough to use them as ceiling tiles on my back porch, and they are very difficult to cut.

Question by Que2   |  last reply


Coil/Electromagnet

Is there any difference between a coil and electromagnet? So, is saying that a dynamic speaker has coil as correct as saying that it has an electromagnet?

Question by .Unknown.   |  last reply


What is the proper way to report a stolen instructable? Answered

If a new instructable is posted that is exactly the same as a different one posted by a different user, how should it be reported? When I say exact, I mean that the exact photos were uploaded as someone elses work. Here is what I mean. Original Instructable:  https://www.instructables.com/id/Colored-Pencil-Beads-1/ Copied Instructable: https://www.instructables.com/id/Colourful-necklace/

Question by gravityisweak   |  last reply


Is it possible to use hot glue as an adhesive for LTD stirling engines? Answered

Is it possible to use hot glue as an adhesive for building low temperatue difference (LTD) stirling engines? I was wondering because I do not want to buy epoxy or other expensive glue. Will I be able to use hot glue, or will the glue melt from the heat of a cup of boiling water? 

Question by Zippo1234   |  last reply


Oral b # 4717 repair.

It appears that the button to turn on has stopped working. Could this be bad batteries? I have continued to push the button and the unit might come on and work fine then I have to push the button several times to get it to turn off?  Now it will not come on at all. Thought we would try opening it up, with your great instructions, and replace the batteries and see if it makes a difference.  My unit is a little different than the one in the picture. Where do we buy the batteries? Thank you.

Question by marysins   |  last reply


project on 555timer or op-amp?

Hey frnds....m in EC 5th sem and i have to make project on 555timer or op-amp..pls suggest me something impressive and different.. ?

Question by eshh   |  last reply


Wood/Biomass Gasifier? Answered

I have always been interested in the principles behind gasification, but I have had some problems fully understanding it due to some differences in the devices I have seen.  I have noticed two real differences which I can only describe as closed and open systems.  Closed systems have some heat source which heats a closed container of wood, this wood is directly fed to an engine or flame.  No air can enter and their is no combustion prior to reaching a torch or the engine.  The open systems I have found to be more common but I can't really grasp how they work.  The fuel source is lit and then the smoke is captured, but this captured smoke is then somehow flammable.  I just find it difficult to understand how this can work in an open air-fed system.  Does anyone have more details on the differences between these two styles?

Question by jj.inc   |  last reply


painting an old table top?

Hello people :) ,  im in the process of painting a table top., ive sanded the top (Lightly) and put an all purpose primer on top, but ive run into a spot of bother, let me explain further. the table top i have detaches from the legs, which bis handy, now looking underneath it, it is painted black, but i can see that it is real wood underneath (i can see and feel grain and knots) BUT on top it seems to be a different wood or covered in something different on top of this, there and rectangles of veneer - which the primer seems to adhere to ok, but the darker part of it dose not seem to pass the fingernail test, so it may  not be the right primer, but im stumped as to what primer i would need, sanding didn't seems to make much of a difference to the dark wood barely dull it really, and im not sure its laminate or some sort of plastic... ive added a picture of the table

Question by aharbinson   |  last reply


would like to know how to set up a jig for picture frame construction.?

How do you build a jig for  different size picture frames, for example, 8x10 or 5x7 or bigger?

Question by binayshi   |  last reply


Suspension Binding? Answered

I know this photo is different looking, but ignore that and look at the shaft.  It, like all other driven independent suspensions has no spline or sliding shaft to allow for movement in and out.  HOW DOES THIS NOT CRUSH THE SHAFT OR JOINTS.

Question by jj.inc   |  last reply


Will concrete stick to PVC?

I'm thinking about making a concrete tube, and I was wondering if I used two different diameter pvc pipes as the mold if I could remove the concrete without damaging it too badly.

Question by PathogenLabs   |  last reply


how to design a wind powered water lifting system?

I need to lift water from the higher tank to the lower tank ( against gravity)...i difference between tank a and tank b is 20 cm only

Question by lulu114   |  last reply


Landing jumps

Does anyone have some useful tips on landing a jump on a dirtbike? How about landing onto a rough, washboard track, any different? I've become very good at landing... on my face...

Topic by Rishnai   |  last reply


Instructable edits do not appear in published version

I have made and saved edits in the following instructable: https://www.instructables.com/id/LED-Jigsaw-Puzzle-Light-Acrylic-Laser-Cut/However whenever I vist the publish instructable they are not shown (I have done edits in other intructables and these have shown up, so I am not sure what is different this time).This is what is published: https://prnt.sc/mi1o90 but this is what is in the edit and preview screens: https://prnt.sc/mi1o4s. You will notice that the 3rd and 4th bullets in the preview screen are missing from the published. I also have changes in the last step that are not reflecting.I have cleared my cache, tried different browsers, networks and ISPs on different devices.I have a few quesitons:Can anyone see the changes that I claim not to be able to see?If this is an issue, will unpublishing and republishing fix it?If I unpublish will I loose my "featured" status as well as the viewing stats?Your help is appreciated.

Topic by abasel   |  last reply


What would be a good material for creating a custom vertically oriented wind turbine blades?

For a school project my group an I are building a vertically oriented wind turbine  similar in orientation to the one in the link(http://www.youtube.com/watch?v=rLa_NY5U1nk) We would like to build a few different designs to test which will give us the best efficiency as we will do using it to generate maximum output voltage. I'm wondering, what would be a good way to create these different custom pieces, especially the curved airfoil shapes we may wish to utilize in the design? Thanks!

Question by ddrocketman   |  last reply


2011 Toyota corolla wire schematic ?

Can anyone help me with this i want to install amp and speakers in front and rear into my stock factory head unit. Problem 1 : i don't have RCA out pins on stock head unit So i bought SCOSCHE RCA CONVERTER. Problem 2: I also don't no each wire color coding i mean to say what those different color of wire do can anybody tell me different  color on my head unit please i attached the head unit photos and RCA converter and my CAR 2011 TOYOTA COROLLA LE

Question by jalisvasim   |  last reply


Can I enter more than 1 Instructable in the same contest?

I have 2 completely different Instructables. Both would be applicable to the same contest. Can I enter both in the same contest?

Question by richard62   |  last reply



Question regarding Light

Hi guys! I had this strange question in my mind from a long time, but i have to yet get a satisfactory answer: What is the difference between a naturally emitted colour and a colour which is generated by covering the light source with a translucent cover of a particular colour? For example: I have a Blue LED whose body/case is actually transparent but on supplying power emits the colour blue naturally. On the other hand, i have a LED which emits a white colour on powering up. Suppose i put some kind of blue translucent film on it, or a translucent paint. I will still get a blue-colour. What are the differences of colour emitted in these two cases?

Topic by charmquark   |  last reply


Using the wrong charger?

What are the risks of using the wrong charger for rechargable batteries?  Can you do it if you don't leave the batteries on too long?  Can you get away with it if you make certain the batteries don't get too hot?  Specificially for my 18V power tools the charger I have is only intended to charge NiCad batteries.  The company that made the tools has also made different types of battery packs that are interchangable in the tools, but each battery pack comes with a different model charger.  What if I used the NiCad charger to recharge a NiMh battery pack?  What if I use the NiCad charger to recharge a Lion battery pack?

Question by etcmn   |  last reply


need to built a telescopic bracket system for my flatscreen.

I want to use my TV as a monitor as well. But I need it to height adjust on the wall about two feet, for the two different uses. No pre-made brackets that do this...any idea what to use to build it? I'm assuming that it would be a  flat screen bracket that can slide up and down on some sort of rod or pole secured to the wall. Not sure what system to use to be able to secure it at the two different heights. It's a 22"....  It seems a waste to not be able to use it for both and clear out the monitor I have now.  Any suggestions are appreciated.

Question by mikimouse11   |  last reply


hexagonal box design?

Looking for tips for efficient design of wooden hexagonal boxes, bottoms, and lids.  Jewelry boxes, canisters, etc.  How to clamp for glue or air brads - I'm thinking a hexagonal jig, but that's potentially a lot of jigs for different-size boxes.

Question by rjvoyerjr   |  last reply