Hi All, Im new to this group, and have some questions reguarding Van de graff Generators. I have constructed a small one about three foot tall. Using a fan...
i have read the whole thread and no one has talked about this setup. i once saw a site (the only one i ever saw) where a guy was able to replicate this device...
Mr. Holmes: Thanks for your post. I am currently building a Bonetti Machine, using 25" acrylic discs. (Most builders use 12" discs). Bonetti machines are...
Hi Nickademusss all the sites I have been to show the machines using a rubber belt. something like a very large wide rubber band. Were can I get one? and is it...
dear sir harold i thought that the vdg was bipolar. i mean on my machine with plastic roller top and metal lower, it produces a positive charge on the sphere...
... HOUMAN: I can only tell you what I believe to be correct. If you want more authoritative answers, then go to those who know more than me, such as Dick...
sorry harold dude i'm not trying to tick you off. i would appreciate input from other people including dick whoem this message was originally intended for. ...
Thanks Richard, for the the info, I forgot to tell everyone that the almost totaly enclosed box im using causes the fan motor im using to overheat. To fix this...
Nickademusss: Yes, there is a theoretical relationship concerning sphere size vs maximum attainable potential: It is 30KV per centimeter of sphere radius, or...
Houman: I think we are into semantics. Lets consider facts. A VDG can be configured to be either + or - at the top terminal. This is all dependent on the...
Zac: I have read that heaters are often used inside the base of VDGs exactly for the purpose of dehydration. Humidity is a killer of VDGs. Keep in mind that if...
Dear friends, I am considering building a wimshurst using 2 old 33 rpm records. Is it advisable? I understand that the 2 discs must be able to take a charge...
Guys, Thanks for all the responces to my many questions, I have posted some pics of it and will try to get one of it in action. My camera wont hold a charge...
Dear Nameless Friend: Rub the discs briskly with a wool cloth, then see if they attract small scraps of paper or the hair on your arm. If you're a woman,...
I would guess just stroke the disc with a piece of fur, wool, slk etc and then the disc ought to attract the hair on your arm, rice krispies, the paper holes...
Guys, I see from the pics of yours and others VDG's that you use a set of pins for the spray bars. Im using copper cut into teath and such. What it the better...
ZAC: Needle points are better at ionizing the surrounding air, making the transfer of electrons to and from the belt more efficient. As for the number of...
Hi I was wondering if anyone has tried making a sphere from resin and aluminium powder? I was thinking of trying it, 50/50 mix resin/powder, and pour it into a...
Zac I used "T" pins pressed through perforated copper clad PC board. The pins are soldered to the back side of the PC board and excess is cut off. I know of...
Bob: I have seen many schemes on making a sphere. Remember the sphere has to be very smooth otherwise the terminal voltage will be limited by corona leakage...
Hi Is it necessary to have a plastic support tube or could you just support the sphere on an arm and run the belt in open air? is there an advantage in putting...
Bob: A tube is a convenient support for the top roller and sphere and, keeps the belt clean but it is also a leakage path to ground. If you could find the...
Hi List: Last night I received a nasty e-mail from Harold Pollner stating that I was negligent by not publicly acknowledging his expertise in the field of...
Thanks for the info, I asked this question as I was having problems finding a suitable tube, I have now found a 6 inch cardboard tube which is just what I need...
Bob: I am experimenting with 4 fiberglass supports for my top roller assembly and sphere support. So far so good. Initial tests look as good if not better than...
... It probably wont work. Any material that absorbs water, even trace amounts, will have ions that will allow charge to leak off. I used 3 liter plastic pop...
hello people. sad to hear about the arms thats been going on this forum but hey life must go on. i have one question that was kind of discussed earlier. is a...
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