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Re: [TCML] rotary gap disk

Heads up on the GP03 material, the 1/2" sheet I bought had a *very* non-uniform density. While it is a superb material for supports and other items, you might run into trouble spinning it as a disk; the 12" diameter disk I made required ten 3/8" holes on one side to balance it. At that point I shelved it due to safety concerns, and when it comes time to complete that project, I will use G-10 which, due to the physical arrangement of the glass fibers (cloth vs random fiber mat), should be of a more uniform density.
For your lower-power application, polycarbonate is the best choice; it is affordable, easy to machine, and has an extremely uniform density. It's only drawback, of course, is a low melting point, but for lower power applications (under a couple kVA), it is fine. 

Jon
----- Original Message ----- From: <jhowson4@xxxxxxxxxxx>
Arg, I wish I had see this before I bought the cheap poly. for a 3/4" thick 12 by 12 inch sheet the cost is $33.78. I guess I could use the poly as a base or something and get some of this GP03 stuff in a couple weeks. 


From: "S&JY" <youngs@xxxxxxxxx>



There is another good and cheaper alternative to G-10. It is GP03, an
electrical grade fiberglass material, available from McMaster-Carr. It
machines well with ordinary tools, and has a temperature range up to 400
degrees F, which is better than G-10 if I remember correctly. I use it in
my RSG and am very satisfied with it. In 2000, a 12" x 12" x 3/8" sheet of 
it cost $9.73. Look at their Part Number 8549K372 to get you to the right
page in their catalog. 

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