... 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"...
Thanks Don Nice to hear from someone and it appears I sent the same message a few times. Ny apologies for that to everyone. I will do as you suggest as I do...
Thanks Dick, I have started the machine and I am taking photos as I progress to give you some idea how am making it. Trev Is there any one out there that has...
I found an inexpensive (free) alternative to gold leaf for making an electroscope. I never actually used a real gold-leaf electroscope, but I understand they...
Ahhh! KFC incredible place to find the components of an electroscope.!! Brings to mind a demo I do during the static show: Take a double page of a newspaper...
Hello Dick, I had posted some a message on 3-2-08 in regards to whether the inside of the upper terminal should be open or closed. If you could look at my...
Hi Todd: I have not seen any discussion on the Forum regarding closed terminals. It appears that your design encloses the upper roller assembly in a cylinder....
At the final demo of the season I was running the big VDG and doing some experiments for the kids. The 5 gallon Leyden bucket was sitting off stage about 15...
Thanks for the quick reply Dick, I have tested in the Dark and no more discharge at the base then when I used an open terminal and I have checked in the dark...
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