Thanks to Michael Porter, Barney Gaylord, and Randall Young for catching the
mistake I made about tailshaft RPM... no idea why I did that. Corrected now...
Secondly, Michael Porter has the following improvement for those of you bound to
tighten the clamping bolts very well!
"The device would be less likely to mar the input shaft if a
clamping collar were made. I realize the shaft is hardened, but if
someone uses grade 8 bolts and cranks down on them to minimize slippage,
there is a chance of damaging the nose of the input shaft. Clamping
collars are a common lathe tool when working on small, delicate pieces.
A suitable clamping collar can be made cheaply by finding a short piece
of copper water pipe of an inside diameter just about equal to that of
the OD of the input shaft, then sawing a slot in one side. Then, it's
just a matter of slipping the clamping collar onto the input shaft, then
tightening the drive tool bolts down."
NOTE: I haven't yet found there to be any slippage of the tool, as there is
pretty much no weight on the input shaft; I assume that someone is holding the
drill while it is operating!
Cheers,
KMR
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