# ericCycles

2

• ericCycles commented on dustin_little's instructable Slip Cast Ceramic Trophies 2 days ago

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

• 2 days ago

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.

• 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.

• ericCycles commented on DrewPaulDesigns's instructable Easy Tesla Coil!3 months ago

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.

• 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.

• 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.

• 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.

• 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/).

• 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 thoug...

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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.

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.

• 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.

• ericCycles enrolled in CNC Class1 year ago
• were you seeing the led flash when it powered up? My led isn't lighting up. I'll try flashing a program next.

• ericCycles commented on Vulcaman's instructable DIY-SLS-3D-Printer1 year ago

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.