In Reply to: machining hasteloy c posted by Gordon on 08/31/02 at 4:22 AM:
Greetings Gordon, HASTELOY means resharpen "after every cut!"
Hole size is a consideration when speed is concerned. I found about 500 rpm for a 1/4" cobalt drill (cobalt min hardness of tool)
MAJOR MAJOR REQUIREMENT is good "sulfer oil"
stinky dark yellow & brown (toxic smoke do not breath!) but its wonderful fo this material.
Also do not let the drill tip "rub without cutting" use a controlled force to enguage the cutter to the material as to take a positive chip.
the cutter must be cutting at all times (with lots of oil).
Many short positive cuts will go farther per tool, than longer cuts that stop cutting before you stop applying pressure.
When the tool starts squealing, STOP, replace
tool or it will be unsharpenable.