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My second Van de Graaff


[The V1]
Much better construction on this one than the prototype, with much better results.


This generator runs off of about 10-20VDC, and, in good humidity, will produce a 5 to 6" spark every few seconds. I spent a considerable amount of time constructing this thing, machining quality parts for it. Both rollers were turned from lexan stock, and given a bevel (made barrel-shaped) so the belt would ride in the center.One was center-drilled to press fit onto the motor shaft, and the other was fitted with tiny bearings with 1/8" inner diameters. The bearing bearing one rides on a little shaft fitted accross the top of the support column. I'm not sure just how fast the belt is traveling, but I can really open it out and get it humming ;)


(whee! I have a little digital video camera now, and it takes mediocre stills. It really is a miserable excuse for a camera, this little 2" square cube that is supposed to sit idly by, perched on top of my monitor)

Here's a top view of the V1, with the upper pully, upper charge collector and terminal support visible. You can also see the motor way down at the base, along with its mounting hardware. The sniy stuff in the lower left is aluminum tape used to make contact with the bottom cover (shown above, made from an aluminum light reflector.)

 

 

This is a close up of the motor mount assembly. You can see the pice of steel I flattened and end of, bent, and drilled to support the PVC pipe via a hose clamp. The height of the motor is adjustable, by loosening the bolt visible here, so it will slide up or down the slot cut the upright support for the motor. You can see where the aluminum tape makes contact with the motor assembly... I only run this thing off of tough brute force power supplies, since the motor case is attached to the lower end (supposedly grounded, but it zaps me!) of this thing. The lower charge brush is sorta visible.. ..it is held against the motor case by another hose clamp, which all acts as te connection to that aluminum tape, which in turn connects to the bottom shroud.

Here's another shot of the motor. You can see the hose clamp, and mounting block. The "mounting block" is the piece of metal between the motor and the upright, into which the little bolt threads, and which has a bevel machined it it to accept the curve of the motor case. Normally I just clip on a pair of test leads to supply power, since I like to use one of my large adjustable supplies on this thing to give good speed control.

 

Here the quality of the upper pully is clearly seen, with its internal bearings :^)

The holes which the terminal support rests in are visible, as are a number of other holes that originally were intended to hold something to keep the shaft from spinning, as I had had problems with that.

 

 

maybe some more later... like neat experiments you can do with these things, including some electrogravitation stuff... I like making aluminum foil float in mid-air.


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email: electrophile@juno.com