... Well, it's mid-winter here in Chicago and many of my projects are on hold until Spring when the garage warms up. I'd spent spent a considerable amount of...
... I've seen plenty of pictures of very large belt VDGs which use a metal pipe/tube capped with a metal hemisphere on each end. It would be easy enough to...
Don Jacobs wrote: <snip> What are the speed-limiting factors of your machines? You mentioned in one of your posts that you do not run your Variac wide open....
Wondering if there was a way to directly measure the strength of an electrostatic field, I found several references to a "field Mill". There are a few sources...
Hi Everyone, I have been working on my VDG. Things are progressing well. Let me give you some details. I have 2 inch diameter rollers. Nylon on the bottom,...
Hello all, I have been busy at work and with my projects but hope to upload some photos of my new projects. I have rebuilt my first VDG and it is direct driven...
Dick Linder, I finally got back to my VDG project. I have my shafts, bearings, Teflon and Nylon (Nylon 6/6 from McMaster-Carr... is that the "right stuff"?),...
... I finally got back to my VDG project. I have my shafts, bearings, Teflon and Nylon (Nylon 6/6 from McMaster-Carr... is that the "right stuff"?), My records...
Dick, Thanks for your prompt and informative reply. Things were getting a little slow in the group, and it's good to see some action. ... I'll try rubbing my...
... expensive. ... Charles, So did I. After doing some extensive (a couple months) online price shopping, I found a 2" Dia x 4" piece on eBay for $9.30 plus...
Don: Yes, this group has an immense aggregate of electrical talent and any sign of its demise is troublesome. I hope anyone out there who might not be posting...
Don: I have experimented with so many rollers, so l-o-n-g ago that your mention of a PVC coupling jogged my memory. Now I am not sure if the coupling or the...
... I'm no expert in VDG making, but- I think a smaller roller will -increase- the force separating the belt from the roller. Consider the same belt speed: the...
Dick, Thanks for your "positive" sharing attitude. The amount of information available here is "shocking". It must have been inspiring to operate the big VDG...
In general all parameters in a VDG will have a bearing on others. Belt speed relates to roller diameter which relates to centrifugal force -tracking-belt ...
Don: Thanks for adding the names. It does clear things up for the initial reader. Yes that VDG is the one that was built by Robert J. Van deGraaff. While at ...
... Oops, I was thinking of a constant roller RPM, and not belt speed when I suggested a smaller diameter roller. You are quite right about smaller rollers...
Hello All, I have uploaded some pics of the Upper terminal. They are in the Todd's Pics album. This was originally a helium tank, it took a lot of sanding and...
In an earlier post, I said, "I'll try rubbing my chunk of Nylon 6/6 with rabbit fur to see if it it dissipates the charge." This was after Dick Linder said he...
Not based on experience but a gut feel:- texturing or grooving etc the roller surface may reduce the surface area touching the belt to the point where the...
... I would be happy with the charging rate "currently" achieved using untextured rollers. The 100 uA you get with a 6" belt is something of a benchmark among...
_____ ... Don wrote: I would be happy with the charging rate "currently" achieved using untextured rollers. The 100 uA you get with a 6" belt is something of a...
Hi! Every one. I am new to the VDG Forum and have just joined. Thanks for having me. My name is Trevor and I live in the tropics (Cairns Australia). I have...
Hi! Every one. I am new to the VDG Forum and have just joined. Thanks for having me. My name is Trevor and I live in the tropics (Cairns Australia). I have...
Hi! every one. I have just joined your group and am looking forward to building a couple of VDG's and Wimshurst machines. I had biult a couple some years back...
... Do any if the machines still exist. If so, please post some photos. Ideally, they should show construction details. ... Welcome to the group, Trevor. 18"...
