On Nov 3, 10:05*am, Bruce in Bangkok
wrote:
....
You can cut either 4140 or stainless with HSS quite successfully. In
fact it was the common job shop method of machining nearly all metals
up to the 1970's when I left the business. And probably still is in
the smaller shops today.

Bruce-in-Bangkok

Agreed, but unless I can postpone the job a day I have to use the
tooling already on the lathe and the metal in the scrap bin.