08-17-2009, 07:43 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
I was going to suggest the same. It sounds like it has work hardened on you. You may have to temper it locally like Bob said or go with the carbide. Make sure when you start an operation like this to keep enough pressure on it to take out a chip. If you stop feeding and let it spin at one depth it work hardens and yes it becomes hard to work.
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