"JRJohnson" wrote in
:

Guys, I am making a drill bit that is 1 1/4" in diameter. This bit is
for drilling end grain wood on a wood lathe. That is, the drill bit
will not turn, but the wood does. Essentially the cutter is a piece
of 5/8" wide planer blade that is brazed to the end of a 1 1/4" tube.
The trailing side of the planer blade is ground away so the leading
edge is in contact with the wood. I want the drill bit to advance
1/8" per revolution. What is the clearance angle I need too achieve
this. That is, what angle should the bottom of the cutter make with
the axis of the bit? Incidentally, an air tube ending just above the
cutter takes the shaving out the top of the bit, very similar to a
rifle drill.

Gotta be someone on this group who can tell me the answer.

TIA,
James Johnson





If the cutting face is perpendicular to the work (no rake), 8-12° should
work fine.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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