Re: Synchronous rotary gaps.

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Synchronous rotary gaps.
From: Tesla List <tesla-at-stic-dot-net>
Date: Sat, 13 Sep 1997 07:26:58 -0500
Approved: tesla-at-stic-dot-net

From: 	teslaman-at-juno-dot-com[SMTP:teslaman-at-juno-dot-com]
Sent: 	Saturday, September 13, 1997 6:59 AM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Synchronous rotary gaps.


On Fri, 12 Sep 1997 23:57:12 -0500 Tesla List <tesla-at-pupman-dot-com> writes:
>
>From: 	William Noble[SMTP:William_B_Noble-at-classic.msn-dot-com]
>Sent: 	Friday, September 12, 1997 2:04 PM
>To: 	Tesla List
>Subject: 	RE: Synchronous rotary gaps.
>
>aren't the motors used on the old disk drives (the ones driven by AC) 
>synchronous?? and also old phonograph motors (remember phonographs - 
>the 
>things that turned at 78RPM??) - I suppose I can test this with a 
>strobe light 
>or something if I really want to.
>
>William..

Yes there are small sync. motors out there.  When I stated that
fractional H.P motors were hard to find I meant small motors which had
enough power to run a rotary disk with electrodes.  The small motors
found in phonographs (some cheapies use shaded pole non-sync motors) and
reel to reel tape decks are very low in power and have gear reduction to
increase torque.  If they were used to direct drive a rotary disk  at
1800 or 3600 R.P.M. I feel there would not be enough torque available. 
As for computer disk drives I did not think about them being synchronous,
maybe one of the old 8" drive motors might work, however once you start
loading electrodes on a disk, the added weight and air resistance take a
toll on small motors.

Kevin E.
>
>
>From: 	teslaman-at-juno-dot-com[SMTP:teslaman-at-juno-dot-com]
>Sent: 	Thursday, September 11, 1997 9:11 PM
>To: 	tesla-at-pupman-dot-com
>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 
>>does)
>>are done with sync. motors.  Is this something coilers are buying or 
>>motors
>>that are being modified?
>>
>>Thanks 
>>Dale.
>>
>>
>>
>>Dale..
>
>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
>tape #47.  
>
>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
>
>Kevin E. 
>
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