robobass fired this volley in news:4da7d3cb-
:

He says he never used the powerfeed at all.

Was the carriage being driven by the leadscrew, or by the feed pinion when
it crashed?

If it was the pinion, it may have bent the pinion shaft, which would
account for the roughness... it would be and odd-feeling sort of cyclic
interference, in that case.

Lloyd