In article ,
Ignoramus21167 wrote:

The servos on my mill have sinusoidal encoders which are not
compatible with most CNC control stuff.

I am looking at various options.

One is to make a converter to convert sinusoidal to quadrature. It is
a pain in the butt to do due to lack of documentation on what wire
does what.

What do you mean by "sinusoidal encoders"? Synchro transformers running at 60
Hz or 400 Hz single phase? What is the make and model of the encoders?


If it's a synchro, there will be five wires (perhaps plus a safety ground). Two
wires will go to a single coil on the rotor. Three wires will go to a Y or
Delta sator coil.

http://www.eugeneleeslover.com/USNAVY/CHAPTER-10-B.html

http://en.wikipedia.org/wiki/Synchro

Synchros are still used because they are simple and extremely rugged.

Anyway, one can buy chips that will convert synchro to angle, and vice versa,
and the wiring isn't that hard to figure out, so making a converter isn't that
hard.

Joe Gwinn