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Help Turning 4140

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To date all my limited experience with turning on the lathe has been with junk yard steel, assumed to be mild steel. I decided that it was time to use some more appropriate steel for making the pins on my Bobcat and got some 4140 and 4340. Today I am turning some 4140 and running into some issues I need guidance with.

It is 1.5" diameter that I am turning down to 1.260". I have the lathe set at 300RPM and using a carbide tool, feed rate of 0.007" with a DOC of 0.015". All starts out fine...

Help Turning 4140

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