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Re: motor for rotary gap

Original poster: "Dave Leddon by way of Terry Fritz <twftesla-at-qwest-dot-net>" <leddon-at-attbi-dot-com>

I used a 6-inch bench grinder purchased from Sears for $40 to build my
first SRSP.  The  rotor was 9 inches in diameter made from  inch G10 which
turned out to be too massive for this one-fifth horsepower motor to spin up
to synchronous speed.  My second rotor was the same diameter but
constructed from  inch G10.  Still too heavy.  So I  cut this rotor down
to 7 inches and was finally able to sync to the line frequency.  So a
6-inch grinder motor would be a good choice if you can live with a smaller


At 07:58 AM 5/13/02 -0600, you wrote:
>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
>You can find inexpensive 6" bench grinders around 20-30 bucks. rpm is 3400, 
>grind two flats on the rotor and can get up to 3600 for synch.
>Bill Shepard
>Thats what I read, and am about to try it.