RE: Ace Hardware grinder Sync conversion? Slot depth opinions

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Thanks John,

I dismantled the grinder a few minutes ago and it 
has a 6.0 uf in the base which seems to go to a 
separate(s) windings for Startup?. All in all I 
think it is the right ticket. Just as Terry's 
pictures show. I am thinking of putting 4 gaps on 
the 12" disk for better balance. These would be 
at 90 degrees each. I have not done any math on 
that yet nor have I calculated the instantaneous 
value of E in a long time:-). I'll just figure on 
the timing based on the rotor speed and the 
length of a 60 cycle sine wave time. It would be 
nice to run 240 BPS. All the electrodes (12) are 
30 degrees apart. I'll remove the 8 for now. I 
have a slew of new CD caps and a well voltage and current controlled pig.

Ok so I think I need 2 slots cut 180 degrees 
opposing for 3600 right? How deep should they be 
machined to get max torque but suitable sync. The 
armature is smallish 1 5/8" wide including the 
aluminum ends and Mics to 2.041 - 2.042 in 
diameter. Does it matter where the cuts are made 
in the armature as long as they face each other? 
Multiple opinions welcome. I think I will take 
this to a machinist friend of mine.

Thanks much for the info. This should blow my 
static blown 15/120 away! I'm jazzed.

Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, July 19, 2005 4:57 PM
To: tesla@xxxxxxxxxx
Subject: Re: Ace Hardware grinder Sync conversion?

Original poster: FutureT@xxxxxxx

In a message dated 7/19/05 10:29:41 AM Eastern
Daylight Time, tesla@xxxxxxxxxx writes:



><Jim> ****John thanks for clarifying that. Iâ??ll
l
>modify the base to make it adjustable. Iâ??ll take
e


Jim,

I've modified cap-run, cap start, induction start, and induction
run, motors, and they all worked fine.  The only type of motor
that is generally poor is the small shaded pole types.  Cap-start
will give extra torque which is helpful for heavy rotors.

I spelled hysteresis incorrectly in my previous posting.

Cheers,
John