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Re: [TCML] ARSG Materials continued
Andrew -
I think the confusion originated in your original post.
You wrote: "The stationary electrodes were going to be made of brass
.......but I started thinking... Aluminum is probably a lot cheaper."
None of your drawings shows the actual electrodes, or specifies the
electrode material. Your drawing titled "ELECTRODE" is actually the
stationary electrode holder.
To clarify your question, you are asking whether aluminum or brass is the
best material for the ELECTRODE HOLDERS and the CONDUCTING RING, right?
Both materials would be suitable from mechanical and machinability
standpoints. My preference would be to use brass, because aluminum forms an
invisibly thin insulating skin of aluminum oxide when exposed to air, and
may end up with slightly higher electrical resistance between joints and
connections.
Have you designed the hub that will connect the RSG disk to the motor shaft?
This is probably the most critical part of the assembly, and needs to be
carefully thought out to avoid introducing runout and vibration into the
assembly. Good design practice would have multiple fasteners securing the
disk to the hub, and at least two dowel pins to locate and transmit torque
from the hub to the disk.
Regards,
Herr Zapp
----- Original Message -----
From: "Andrew Robinson" <teslamad@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, July 10, 2009 8:22 PM
Subject: [TCML] ARSG Materials continued
Ok... thanks for all your replies... but now I have conflicting opinions.
One says yay Al and another says boo Al. Can you guys show some supporting
data so I can make the final decision on which material to use. FYI in
case you didnt look at our engineering diagrams, the Al will only be used
for the conducting ring and electrode supports. The actual electrode
electrodes are .25" tungsten. Look at the diagrams and note the materials
at the bottom of the designs. Thanks, Andrew
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