Hi BR549,
thanks for your reply.
The spindle has no indexer built in but several ideas occurred to me that might work.
For the rpm involved, less than 5000 say, it might be possible to drive a small motor by belt from the shaft above the clamp nut
as a crude tacho. Might also be feasible to use an optical counter such as RC guys use.
The last idea I had was that as I recall it was possible for the VFD to measure slip as a near to linear approximation to demand torque.
Either way I think it possible to reasonably determine rpm and or torque which would be sufficient for my purpose.
After I first posted I started looking at the OEM DRO's and buttons and noted quite a few which could offer some control over federate
under software control. As an aside it is a bad habit of mine to start thinking after I've already opened my mouth.
Your reply suggests that it may to reduce/stop feed live rather than delayed by the buffer and that interests me. My guess is that it
would be necessary to reduce the federate within milliseconds to avoid a stall with the rotational inertia of the spindle being the only
(time) saving grace.
Thanks again, I will RTFM. If anyone has any ideas to focus my search please post...
Craig