RE: [TCML] my recommendation for a SRSG motor arbor

["Terry Oxandale" <Toxandale@xxxxxxx>]

When I built my first one, I got it pretty close based upon the use of a
divider and scribed arcs to find the center of the disc, then laid the
flange onto this center mark and proceeded to mark the mounting holes.
Then I rigidly mounted the motor/disc assembly in place, and while the
motor rotated under reduced voltage, I used a lathe cutting tool set-up
to carefully turn the OD of the disc until there was no run-out, and
this resulted in a balanced disc. I used a variable AC supply initially
to avoid high RPMs in the unbalanced state until this was done. The G-10
cuts very easily.


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Jon Danniken
Sent: Thursday, November 29, 2007 10:05 AM
To: Tesla Coil Mailing List
Cc: David Rieben
Subject: Re: [TCML] my recommendation for a SRSG motor arbor

----- Original Message ----- 
From: "David Rieben"
[snip]
>  I simply drilled out 3
> matching 1/4"  holes in my G-10 rotary disc to match the
> tapped holes on the bushing and screwed the disc to the
> bushing face via these holes with proper size/length bolts
> and lock washers.

David, how did you ensure that the center of the bushing was concentric
with 
the center of your disc?

I'm using a shaft arbor right now, which means a hole in the center of
the 
disk (pretty easy), but I can't for the life of me figure out how to
layout 
the holes on the disk to correspond with a bushing hole pattern without 
having access to a mill or an X-Y table. .

Jon 

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