DIY Electrostatic Motor
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Uploader Comments (AHW214)
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All Comments (11)
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put a dimple on bottom inside surface of the cup
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very nice narrating
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Well done. Cool projects. It is fairly impressive you have a van der graff generator at home to use. I hope you have taken the safety precautions needed to use it safely.
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To balance: get a plastic balanced disk, ex. a mini frisbee that's MUCH heavier than the cup. on skewer, find cup's balance point & mark with felt pen, turn cup over & from inside press in a slight dimple a pen. Place cup over skewer again in dimple. On top of cup, balance the disk. Hold a needle with pliers, heat needle tip red hot with lighter, pierce BOTH disk & cup. Reheat & do in 3 more spots to melt disk+cup together. The heavy disk's balanced spin will compensate for unbalanced cup.
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take a pen tube and cut it ti size then put the tube it the center of the cup and glue it there to make it stable
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if you can get your hands on a cd/dvd or hard drive platter from a computer, they all have great bearings. put your cup on top and give it a spin
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Very good. :) ~ How did you choose 3 as the number of the foil pieces? ~ I agree with the commenter who said to put an indentation (but not a hole) in the inside center of the bottom of the cup. ~ I've no suggestions for the 3-bottle version.
maintoc 1 year ago
@maintoc
I think I read to use 3 on a website.
AHW214 1 year ago
@AHW214 : for the foil commutators, you need a # of commutators that is NOT a multiple of the # of contacts. He had 2 contacts, so he cannot use 2, 4, or 6 foils because 2 foil pieces on either side of the cup would simultaneously be at the 2 wire points & this would cancel out the spin & he'd have to push it to get it going again. Ideally, only 1 foil will be at 1 contact at any time. In practice, a tiny portion of 1 foil can be at 1 wire if AT the 2nd wire a LARGE area of foil is present.
ymi2b 6 months ago
@ymi2b
That makes a lot of sense, thanks for the post.
AHW214 6 months ago