Allis Chalmers Frame 1

[mls1]

We have a number of old 4160V Allis Chalmers motors that we plan to replace with new motors. We'll need to adapt the frame but can't find any information on the existing frame dimensions. The motors are 100 Hp and have a frame size stamped on the nameplate of 23BS8. It also states that they are NEMA design, Allis Chalmers, Type AW motors. We can't find any NEMA frame table with 23BS8. I believe the S typically would imply short shaft but I've not seen a B in a frame size. Does anyone know of a table with this frame size identified?

 

[waross]

After some time spent searching. No luck.
I did find this motor that was sold at auction in 2010;
Electric Motor, Allis Chalmers, Type AZ-CH, S/N 1-5128-8924 8-1-1, 125hp, 3560rpm, 2300V, Frame 23PS6, 1.0SF, EXP Proof, 31A, 3ph, kVA Code G, Qty 1
That number may be an Allis Chalmers number rather than a NEMA number.
What is the shaft hight?

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[LionelHutz]

We just happened to use two motors with that frame for testing. About 7 or 8 years ago we did acquire a dimension sheet we used to build the base to mount the motors coupled end to end. I found the page and scanned it and attached it. It's not very clear but it should work. You can see the place it was faxed from on the top of the page if you wish to pursue a better copy.

 

[mls1]

That is exactly what we needed. Thanks!