Looks like the clapper box on the shaper in the video is jammed. Even if
at that low speed, the acceleration at reversal isn't enough to flip the
tool tip well up so it doesn't touch the work on the way back, it
shouldn't make just as much graunching noise as on the forward stroke. I
didn't see it flip up at all. (The pivoted arm in the scotch yoke makes
the return stroke faster, increasing the acceleration at reversal.)
Wouldn't expect the cutting edge to hold up with all that rubbing on the
backstroke.
We just held the work proud in the vice when the whole top surface was
machined. Perhaps due to the more rigid workholding, and sharp tools,
machining was a lot quieter than in the video.
Erik
--
The tools we use have a profound and devious influence on our thinking
habits, and therefore on our thinking abilities.
-Edsgar W. Dijkstra
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