Date: Thu Feb 15 16:29:38 2007

Author: Sam Sampere

Subject: Re: Van de Graaffs

Post:
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It's trivial, even though I didn't try it. Here's how...
=20
Remove the bearings from the top roller. Bore out the top roller to some =
ID you can work with. Make a nylon, delrin, or whatever piece that =
presses into that, with a hole along the axis that fits snugly onto the =
shaft. Drill and tap through the surface of both pieces so you can =
insert a set screw that secures both pieces together and grabs the =
shaft.
=20
There, bottom roller finished.
=20
Take your old bottom roller and enlarge the center hole a bit so the top =
axle freely fits through. Machine some recesses so the bearings fit =
snugly inside. No need for any screws here.=20
=20
C'est fini!=20
=20
Sam=20

________________________________

From: tap-l-owner@lists.ncsu.edu on behalf of John Welch
Sent: Thu 2/15/2007 4:12 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Van de Graaffs



Since my earlier post ended up without a subject, I'll try asking this
again-

Has anyone tried replacing the cloth covered metal roller in the base of
a Winsco VDG and/or reversed the rollers to get a positive charged
ball? I'd like to try but it doesn't look trivial, so any tips would be
appreciated.
-John




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