Hello and sorry to revive an old thread, but I have a question about the original decision to replace the spindle motor.

Did you decide to replace because it was 3ph and you wanted to be able to operate from 1ph, or was there a problem being able to operated and control the original spindle drive from the new control?

I have a somewhat newer 1985 CHNC II with a GN10 control I would like to retrofit, but would rather leave the original spindle motor and drive if possible.

Thanks Gary Breiling