re: Help identify a Sigma stepper

Wally,

Sorry for the delayed post, I'm in digest mode and obviously weeks behind in
my reading.

My Sigma catalog identifies some motors, but not yours. My suspicion is
this one is a custom. However you can be pretty sure of some parameters
common for the 4288 size;

Diameter 4.2"
Length 8.8"
Holding torque 1810 oz in
Detent torque 35 "
Rotor inertia 62 oz in2
Weight 23 lb

The windings may be different form the one listed; 12 A, 0.27 ohm This
winding version develops 1/2 HP at 3,000 steps/sec (900 RPM) and 90V drive!

I would like to find a monster like that for my Bridgeport knee, know of any
more available?

Tommy

>Can anyone help me identify the specs for a Sigma instruments stepper
>motor.
>
>Model 21-4288D-28099
>
>Date stamped on motor Aug 3 79
>Weight aprox 25Lb
>Shaft 5/8 keyed on front and 3/8 on rear
>Motor lenght not including shafts 9"
>Dia of motor about 4 3/8"
>MTG bolt patern on front flange 3.5"
>8 wires

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