RE: [TCML] Salient Pole Query

["Bob Kibler" <rkibler@xxxxxxxxxxxxxx>]

Another way to do it is to mount the rotor in a vise and mill the flats off
by hand with a 14" mill bastard file. I started with a Gould Century 1/4 hp
1725 rpm induction motor. The width of each of the four flats is  about 1/3
the diameter of the rotor. It now runs synchronous at 1800 rpm. Time, about
1 hour.

Bob

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of G Hunter
Sent: Tuesday, December 02, 2008 6:46 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Salient Pole Query

> I'll echo John's experience.  After converting
> about a half-dozen motors, the only thing to strive for is
> that your flats are the same width, and have a uniform
> angular spacing between them.   As far as precision, I used
> a 4.5" angle grinder, and they turned out fine using
> John's rule of thumb given above.
> 

How did you make the flats with an angle grinder?  Did you mount the grinder
or the rotor in some sort of jig?  Did you try to balance the rotor, or does
a small imbalance matter?

Cheers,

Greg


      
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