In article ,
"Tom Del Rosso" wrote:

Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less of
a jolt.

I thing the friction welder stopped as it was programmed to stop, not
that it was stalled by the workpiece. That machine is not a lathe,
despite the chuck. It appears to be a direct drive friction welder.

Joe Gwinn