Just for clarification.... I need about 1/4 hp to drive a 5 inch wide belt at about 60 miles per hour. The most practical approach to this was a Variac...
My vdg is getting worse every time I mess with it. Wound my lower pulley with a bit more shoelace, so I could try using that 3" caution tape for a belt....
Saw this thread while looking thru old posts. Soneone made a brushless motor for a science fair using a reed switch to control a transistor. (One phase motor,...
Hi everyone: I am using a universal (brush type) motor with a variac for speed adjustment. This is a 1/2 hp motor and it's only 4" diameter and 6" long. I have...
Had an idea for an economical column material the other day: fiberglass driveway markers. Not very expensive, but they seem pretty stiff. I would bundle them...
Lincoln & all: What started me on the bizarre design of a "4 poster" was the fact that an equivalent plexi tube would have required bank loan :-) Each post is...
I have since recalled saving a fiberglass ski pole, shattered a bit at one end, from the dump. Depending on how much it weighs, it is destined either for a...
Hi I have a question about roller design, I know what materials to use (I have a silicon roller and a Nylon roller) but what about the shape of the roller. I...
It really does work that way. Not sure why, but the belts really do seem to climb to the high point. I have a rubber band drive on my VDG. The drive pulley...
Mr. Linder: I'm wondering if you can go into a little more detail about the coatings which didn't work so well? (It's easy for me to tell which coatings are...
Lincoln & all interested parties: I spent a lot of time and fortunatley little money researching coatings. The first problem is conductivity and the best...
Fortunately, I have the forms issue under control: in the dollar store: nested plastic bowls, largest maybe 12" dia., rounding nicely to horizontal at bottom...
They have rims so you will have to do some cutting, but at least they are large and cheap. Wish I could edit previous post, as I think the tone might seem a ...
Can any one help? I'm looking for the laser equivilent of this yahoo group, OR a forum like forum.4hv.org, but for lasers? Thanks. -- -- Derrik "I use...
Paul: My first change would be to re-design the "brushes". You will not create corona between the aluminum edges and the roller. Van deGraaff used steel...
Dick, Thank you very much for responding. I removed my original post an hour after I put it up, because I made one more effort at making it work, and after...
Derrik, Candlepowerforums.com, lasers may be what you're looking for. Here's a link that may work. If not, I'm sure you can get in through their home page. ...
Paul: I now have 13 microamps and 1 inch sparks just from rollers and belt (no electrode)!!! ... The short circuit current is not dependent on the presence or...
Congrats. I bet that device will be phenomenal when you put a sphere on. If I were you, I wouldn't do any more fiddling until I'd tried it with a terminal. We...
Hi everybody After several terminal designs, in a try to get as much voltage out of a terminal as possible. And also so the terminal would be easily...
Dick and Lincoln, Thank you for your great advice and encouragement. Friends sure multiply your fun! Lincoln, I'm with you on not messing up something that...
Hi, I was wondering how to get a very high charging current and a high efficiency (output power / input power). I guess to maximize the efficiency I should aim...
Hi Dude, What we really need is someone with the experience of succesfully getting the maximum current possible in a VDG. That's not me. But here's my take as...
Thanks for your reply I thought about it some more and here is what I've got so far The maximum charge density is determined by the dielectric strength and...
A great discussion on efficiency and belt properties! When I designed VDG junior and VDG senior I chose to try a few belt materials/sizes/speeds/spray points...
Hi all: A bit off topic but maybe of interest as an accessory to a VDG. I built a Leyden Jar using a 5 gallon polyethelyne bucket. The top of the bucket has a...
Hello Richard I enjoy reading your informative posts. Did you impregnate the nylon material with vinyl yourself, or is this vinyl impregnated nylon material...
Hi All Does anybody know any other material besides nylon that is positive on the triboelectric series and that is easy to get or that has a long live on a...
Make a roller out of a glass jar (note that some jars have a crown built in), or else wrap leather shoelaces around your roller. Or what about just covering...
I have already built a roller with nylon cord glued on it but it got dirty pretty fast even without using it in the VDG (just by handling it) and I think a...
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