Vance Jaqua wrote:

 None of my lathes nor drill presses have any feature
to engage the flats on the tang - I have always felt
the tang's primary goal was to prevent "mushroom"
damage of the taper in "knockout". I think you will
find that the chuck on your drill press is held with a
tiny #33  taper (which is giving up on my cheap Taiwan
special. In this same vein, a knowledgeable friend of
mine indicated that the primary use of the woodruff
key on most tapers was for initial alignment and
torquing the nut - maybe? in any
case the four large woodruffs in some of the drawings
look more like stress raisers than drivers - Vance

There are only two in my drawing of the modification
to Jim Mantyla's PSRU shaft but if it will make you
happy delete one of them. Feel free to make it smaller. Aas
you say it is just there to torque the nut.

Paul Lamar
 
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