In article ,
jim rozen wrote:
In article ,
says...

Don't mess about trying to grind HSS for the bits - it's so much
easier to turn carbon steel drill rod to the right profile in its soft
state in the lathe and then flame harden it.

Hmm. So you initially use a lathe to turn a *round*
part, with the correct taper shape to just fit inside
the space between the gear teeth, and then remove
about half of it to make the fly cutter?

Except that he is not making a fly cutter, but rather a
D-profile milling cutter (somewhat akin to a D-profile reamer.) There,
the round starting shape is needed.

Enjoy,
DoN.
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