"Jim Wilkins" wrote in message
...
"Bob La Londe" wrote in message
...

The first HSS bit I grab for quick jobs in aluminum, brass, mild and
harder steel and stainless is ground like a threading tool, but
closer to 90 degrees than 60 so the point holds up longer. ...

--jsw

The angle is very close to the 80 degrees of a Trigon or Diamond
insert, which is good for both straight turning and facing a shoulder.
http://www.practicalmachinist.com/vb...tooling-91711/

--jsw