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RE: Strong Rotor Material???

Original poster: "Paul Marshall" <klugmann@xxxxxxxxxxx>

First of all I'd do some simple calculations to determine how much centerfugial force you will have (How thick the rotor has to be) at max RPM. The RPMS are high but the radius is fairly small, which is good. My material of choice would be lexan. The only thing that may cause problems would be heat. Lexan should have good strength properties until it hits about 350 - 400 F. I could see where might exceed that in localized heating, but I don't think your rotor will ever hit 350F.

Paul S. Marshall

From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Strong Rotor Material???
Date: Thu, 06 Jan 2005 18:17:19 -0700

Original poster: "Gary Weaver" <gary350@xxxxxxxxxxxxx>

Where can I buy some strong rotor material.  My rotor  is going to be 5
inch diameter maximum maybe only 4 inch diameter with 1 sheet metal
contacts held on with small bolts.  The rotor will be bolted to a 2 inch
diameter metal hub turned by a motor.  There will be a 2 inch diameter hole
in the rotor material with eight 1/4" x 28 bolts holding it to the hub.
The material needs to be strong enough to turn 7500 RPM's without self

This is NOT going to be a spark gap rotor.  The rotor will be used to
direct sparks to 4 different places.   I worry about having a fire ring or
spark ring around the rotor.  I have seen rotors that produces a continuous
circle of sparks that shorts out all the contacts.   I thought about using
the distributor from a car engine but I think the voltage will be too high
for that and would jump across all the contacts on the inside of the
distributor cap.

Gary Weaver