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  • Keep Your Drinks Carbonated for Days (DIY Kitchen Accessory)

    I once had the idea of trying to make water fizz with compressed air instead of CO2. It failed, because CO2 likes to dissolve in water whereas oxygen and nitrogen don't (at the same pressures). In short, not all gasses are created equal.

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  • The Greek Warrior (Terracotta)

    I wonder if you could avoid the air bubble explosion problem during kilning by very slowly raising the temperature. the hope is that the air would diffuse through the clay before the pressure got high enough to burst it.

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  • Small Wimshurst Generator From Cardboard and CDs

    I believe the sheen isn't a coating but the diffraction grating effect of the very fine lines on the plastic.

    I've been working on Wimshurst machine based on LP's (coated them in laquer in case the black vinyl was slightly conductive), aluminum tape, 3d printed pulleys, surgical tubing for the belts (sewn together at the ends. There is a little roller that keeps the figure-8 belt from rubbing on itself. Just the mechanical parts are done so far. However, as a test, I put a piece of masking tape at the top of each disk, with the idea that if the discs moved synchronously but in different directions, the pieces of tape would line up each time they reached the top. However, after a number of turns the pieces of tapes aren't lined up properly, it, the test failed. As far as I can feel, there; there is great traction between belts and the pulleys. Any one have any ideas? How do people normally keep t…

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    I've been working on Wimshurst machine based on LP's (coated them in laquer in case the black vinyl was slightly conductive), aluminum tape, 3d printed pulleys, surgical tubing for the belts (sewn together at the ends. There is a little roller that keeps the figure-8 belt from rubbing on itself. Just the mechanical parts are done so far. However, as a test, I put a piece of masking tape at the top of each disk, with the idea that if the discs moved synchronously but in different directions, the pieces of tape would line up each time they reached the top. However, after a number of turns the pieces of tapes aren't lined up properly, it, the test failed. As far as I can feel, there; there is great traction between belts and the pulleys. Any one have any ideas? How do people normally keep the disks properly synchronized?

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  • Top 10 Ways to Cut Metal - Without an Angle Grinder!

    I have the Evolution Rage chopsaw (you mentioned the brand). Its definitely one of my favorite tools. As long as the material you are trying to cut fits, its like cutting through cheddar (wood, non-ferrous, ferrous). I just wish there was a decent clamping mechansim to hold small pieces.The Dremel EZ Lock mechanism and associated cutting wheels are also in my list of favorite toys.

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  • 3D Printing: 3D Print a Solderless Circuit Board

    Using the copper based conductiive inks would lend itself to tinning using a tinning solution like liquid-tin. That would give you greater conductivity as well.

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  • LEDs can be used as light sensors, so if your matrix let you measure the voltage across each led before applying power to it, you might be able dispense with the external sensor. But your method is probably more practical :-).

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  • ericCycles commented on gzumwalt's instructable Darth

    what would have been the next step up is if when the armour was opened up, we saw the damaged remains of man inside.

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  • The top and bottom of that drum are relatively thin and not designed to support any force. I believe The holes you cut for rods will eventually deform or crack if you have any significant amount of compost in there. You need a system to distribute the force.

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  • ericCycles commented on f.dirosa.0175's instructable Filament0.1

    The instructable is incomplete without a picture of the filament produced and some indication of its quality. I'm not saying it has to produce commercial quality filament (those tend to be relatively large machines), just that it should be reported. Are there air bubbles in the filament? How much variation is there in the width? What are the problems still to be overcome?

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  • ericCycles commented on fotovidx's instructable Unicorn Electro

    I would suggest adding a cage around the propeller so you didn't do the vitamix blender thing to any swimmers you passed above. I'm guessing that thing could easily mangle a few fingers, if not remove them.

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      • Silicone Cast Tardigrade
      • TinkerCAD - Peg Board Planter
      • TinkerCAD - Piranha Planter
  • I did a variation on this: I found a slow cooker in which the ceramic pot was large enough to hold a reel of filament. Then I took the handle off the lid, it was held on by a screw that went through the lid, and epoxied a manual valve to that hole. To use, I hook the vacuum pump to the other end of the value and pump. After I get the requisite pressure, I can shut off the value and remove the pump. That's the theory at least.In practice, my silicone goop hasn't made a decent seal against the lid (verified by putting a of water at the rim of the lid and pumping). Any suggestions for getting a better seal?

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  • Brilliant! I'll be making one.

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  • that explains all those hollow ceramic figures I've seen in the past.

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  • In my dark still-a-student days, a roommates mother brought over a vacuum that basically bubbled the incoming air+dirt through a few litres of water. I thought it was a really cool idea at the time. Years later, researching it, I found the concept had two problems:1) When the air bubbles up through the water, any dirt that isn't on the surface of the bubble isn't going to be captured. The bigger the bubbles, the less the water captures. So, not very effective for small stuff.2) Unless you sterilize the system before each use, the water+dirt is a growth medium for pathogens and the bubbling releases some of the water into the air as an aerosol (the later models of the aerogarden used an aquarium pump and stone for that same purpose). Think Legionaires Disease.

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  • 1) has anybody tried using an electric frying pan for melting plastic rather than a toaster oven? all google found was people trying to remove melted plastic from their pan after an accident :-)2) my understanding of one of the ways they make window glass is to pour the melten glass onto top of molten tin. The tin is denser but has a lower melting point so that you can pick the solid glass off while the tin is still liquid, giving you that perfect surface. Is there something with high enough boiling point that it won't vaporize, but low enough melting point that you could melt the plastic on top of it in a similar manner.

    Electric frying pans have thermostats also, but you need to do your own calibration of them, the dial settings only vaguely reflect reality.

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  • What distinguishes this from the dozens of other slayer exciter circuits on instructables?Your second "Fun fact" is based on a logical fallacy. X contains Z and Y contains Z does not imply that X is a Y or Y is an X.

    I have built one of these, though not yours. All the slayer exciter coils circuits out there are pretty much the same schematic; one transistor, a few loops of a primary coil, and a big secondary coil that has the bottom tied to the base of the transistor in some way. The only difference I see is that yours replaced an led with two capacitors.

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  • You get a presta bike valve from an old bike tire,drill a hold in a bottle cap for the bike valve,insert the end of the bike through the hole,add a nut and washers and teflon gas tape to either side.Then attach your bike pump and pump away.The air cannon/pop bottle rocket projects have lots of alternative designs for inflating a pop bottle using a bike pump.

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  • If you just need the liquid nitrogen/dry ice to reinflate the bottles so that they fill the sleeve, I would look a a bottle cap outfitted with a bicycle tire valve.

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  • A strong wind will eventually rip the plastic right through those staples.I would recommend sandwiching the plastic with extra wood strips so its held uniformly along its length.

    A strong wind will eventually rip the plastic right through those staples.I would recommend sandwiching the plastic with extra wood strips so its held uniformly along its length.

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  • My understanding is that this design doesn't scale well because as the pipes get longer, they bow under the weight of your tool. There is another project you can find that should be stabler called RootCNC (https://rootcnc.com/).

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  • a magnetic field can induce currents in any conductor.if that wasn't the case, generators with copper windings wouldn't produce power, nor would transformers work.

    I love the design. I just have two questions about it.1) The description talks about eddy currents reducing the length of the time the field is sustained. The other possible cause would be the nature of the metal changing the inductance. If this was the case, I'd expect a ferromagnetic object to delay the fields collapse, and a non-ferromagnetic object (like copper or aluminum) to speed up the collapse. If it was eddy currents, you'd expect the both types of metals to have the same effect.2) the signal diodes across the transistors hooked up to the transmitting coils look curiously placed. My understanding of inductors is that when the field collapses, the energy reclaimed from the field drives electrons in the same direction as they were already going. In which case, I would have thought…

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    I love the design. I just have two questions about it.1) The description talks about eddy currents reducing the length of the time the field is sustained. The other possible cause would be the nature of the metal changing the inductance. If this was the case, I'd expect a ferromagnetic object to delay the fields collapse, and a non-ferromagnetic object (like copper or aluminum) to speed up the collapse. If it was eddy currents, you'd expect the both types of metals to have the same effect.2) the signal diodes across the transistors hooked up to the transmitting coils look curiously placed. My understanding of inductors is that when the field collapses, the energy reclaimed from the field drives electrons in the same direction as they were already going. In which case, I would have thought the diodes should be across the transmitting coils, not the transistors. I would be interested to know if any current flows through the diodes in their current placement.

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  • For small seedlings, I used to do this. I now use transparent plastic cups with some little holes punched in the bottom. They don't sag and tear when they get wet, and you see if the seedling is becoming rootbound.

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  • were you seeing the led flash when it powered up? My led isn't lighting up. I'll try flashing a program next.

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  • ericCycles commented on Vulcaman's instructable DIY-SLS-3D-Printer

    My understanding is that commercial units have heaters for the beds so that the printing material is raised up to temperature just below the melting point so that laser beam just has to put-it-over-the-edge. Ie, lets you use a lower powered laser for a particular material.

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