"Dark" cutting oil usually means it is "sulfurized." Sulfurized cutting
oil is good for machining steel and should work better even if hand
drilling. "Light" cutting oil is not sulfurized and is not best for
My opinion is that you should be using a drill press, turning at low
speed, well lubricated, with frequent drill extractions to remove chips
and at moderate to strong cutting force. Don't let the drill spin freely
as that will tend to work harden the material and make cutting more
difficult. The goal of managing cutting speeds and feeds is to make sure
enough material is removed to prevent work hardening but without
excessive wear of the tool bits.
Unless you have a really big drill press, starting with a smaller drill
bit, say 1/4-inch, will really help. Trying to do this with a hand drill
will be pretty much hopeless, I think.
Jim Miller KG0KP wrote:
> Finally, somebody who KNOWS about cutting oil...
Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
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