"JR North" wrote in message
.. .
Have a project, need a gear for a stepper with .187" Dia D shaft. I can
make the gear; are there broaches for forming the pilot bore? Seems there
would be a bazillion different ones, depending on the width of the flat.
Else, how to?
JR
Dweller in the cellar
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Home Page: http://www.seanet.com/~jasonrnorth
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HVAC motors commonly use fairly wide flats, some 1 and some 2 at 90 degrees,
with round fan hub bores and setscrews. Some of the single flats seem to be
nearly to the center of the shaft. So I would try a round bore with one or
more setscrews.

Don Young