On 2014-04-28, robobass wrote:
Am Montag, 28. April 2014 12:51:57 UTC+2 schrieb Lloyd E. Sponenburgh:
robobass fired this volley in news:4da7d3cb-

[ ... ]

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,
It's a simple machine:
http://i389.photobucket.com/albums/o...psdbbd2f4d.jpg

There's no feed pinion, just the half nut which is used for both
threading and power feed. The gear on the rack to the hand wheel is
always engaged,

That is the pinion in question.

but now that I think about it, neither of those should
have been affected by the accident, since they wouldn't have been under
any drive force at the time. All this points to the saddle, or am I
missing something?

There *is* a feed pinion. It is geared (or directly connected
to) the handwheel, and it would have been engaged full time -- as the
handwheel turns when the carriage moves.

And a crash which tries to lift the carriage above the bed would
attempt to bend the pinion, so that could be the problem.

Good Luck,
DoN.

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