Lots of new pictures here.

http://igor.chudov.com/projects/Brid...-Table-U12PNC/

This is a servo motor driven rotary table Troyke U12PNC.

I thought that it was a simple servo motor with a tachometer and
encoder on the back. Nothing could be further from the truth. When I
opened it up, the tach was on the back alright, but no encoder.

I took off a box hanging on the front of this contraption and I think
this is where the encoder is. There are two cylinders.

One is called "Electro-craft moving coil tach generator". Part
0100-00-022.

The other is "Summit engineering, Boseman MT. Model 573-211-10, 2500
Hz, rotor 1 phase, stator 2 ph, spec code H.S.C.T., 11BRW-300-70/10."

Does anyone have AN idea just what are they and whether I can use it
as a quadrature encoder.

On the rear of the motor, there is not enoug free hanging shaft to
mount a modern encoder.

My uneducated guess is that it is a "resolver".

Thanks