Re: Synchronous rotary gaps.
Sent: Thursday, September 11, 1997 9:11 PM
Subject: Re: Synchronous rotary gaps.
On Wed, 10 Sep 1997 22:30:19 -0500 Tesla List <tesla-at-pupman-dot-com> writes:
>From: Dale F. Pfaffle[SMTP:pfaffle-at-tele-net-dot-net]
>Sent: Wednesday, September 10, 1997 8:40 PM
>To: tesla list
>Subject: Synchronous rotary gaps.
>These synchronous rotary gaps, I am assuming (and I know what that
>are done with sync. motors. Is this something coilers are buying or
>that are being modified?
Sync. motors in the fractional H.P. range are very rare, even in the low
integral H.P. range. Most sync. motors in use for rotary spark gaps are
custom made, either by the coiler or a machine shop. You can modify an
induction motor to run sync. by milling, filing or grinding flats on the
armature. An example is given by John Freau on one of Richard Hull's
(TCBOR) video tapes that he sells somewhere in web land. I believe it is
I also sell modified sync. motors which are approx. 1/25 H.P. 3600
R.P.M. have ball bearings with a 5/16" x 1" shaft. I have been selling
them for $22.00 plus shipping.
This motor on my prototype will spin a 7" dia. phenolic disk 1/4" thick
with 2-electrodes running 120 breaks per second with power to spare.
If you are interested in one, e-mail me at:
teslaman-at-aol-dot-com or teslaman-at-juno-dot-com