Re: Ace Hardware grinder Sync conversion?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Jim,

I think you could just make a gap rotor like a 
grinding wheel.  Just make a rotor that fits like 
a grinding wheel stone and you can use it as a grinder and sync gap.

Any AC induction motor that is not welded 
together can be converted by grinding flats in the rotor:

http://hot-streamer.com/TeslaCoils/Misc/syncmot.zip

http://hot-streamer.com/TeslaCoils/Misc/sync_motor.txt

It will run hotter, but since your's is big, is 
should still easily have enough power for grinding too...

The motor will run at 3600.00... RPM so two 
electrodes would do 120 BPS.  It will always sync 
up the first time, every time.  It will be a big 
high speed spinning thing, so balance and guards 
are needed incase anything flies apart.

Cheers,

        Terry


At 05:02 PM 7/18/2005, you wrote:
> Hello All,
>
> Recently, â??side jobsâ?? are increasing cutting 
> into my retirement time, so my DC coil work/play 
> is getting side lined for awhile. Consequently, 
> I was wondering if a relatively new 3450 1/3 
> horse power 3.5 amp inexpensive grinder from Ace 
> Hardware (China) could be converted to a 3600 
> synchronous motor. There is no endplay and it 
> runs smooth. As this may be temporary, I donâ??t 
> want to fiddle with phase control and such and 
> am willing to make a few starts to get on the AC peak.
>
> I bought a ½ Hp 5/8" as everything is way less Flimsy and therefore safer.
>
> The shaft is ½â?? which is the way my rotor is 
> set upâ?º There is no apparent startup cap 
> although I have not disassembled the base. It 
> will have to have enough torque after the 
> modification to sync up a 11.75" 3/8" G10 disk 
> with 12 nut cinched  3/8" brass all tread 
> mounted 1/8" X 1.5" tungsten electrodes. (since 
> this would run 720 BPS! I will probably remove half of them)
>
> In know this subject has been thoroughly milked; 
> but, I know enough to be dangerous with AC 
> motors:-)I guess I could run async; however, I 
> would rather not subject my new CD caps to that perceived abuse?
>
> If anyone has tried this conversion with this 
> setup I would appreciate taping your experience 
> or if the motor is unsuitable, comments would be welcomed.
>
> Regards and Long Sparks,
>
> Jim Mora
> Ojai,Ca.