[GLCarlson]

There was a Tormach 1100 with clear path servos for sale on the facebook tormach group some time ago, but no statement/review of the resulting combination.

Also a thread on linuxcnc and here about a 4th axis configured this way, no review of the results (other than that the OP loves them) once the wiring issue was sorted out.

https://forum.linuxcnc.org/pathpilot...t?limitstart=0
http://www.cnczone.com/forums/tormac...pathpilot.html

Tim, thanks. I hadn't seen the 1100 facebook post, but that's directly on point to the question. Perhaps the owner will comment here.

The 4th axis thread is also helpful. It appears that one can swap servo for stepper on a 4th axis (and, if there, why not elsewhere?), but not as a straight drop-in; some control code changes are needed.