Grinding Tool Bits - LittleMachineShop.com
Grinding Tool Bits When you purchase a new lathe tool bit, it might have an angle on the end, but it is not properly sharpened for turning. Grinding ... cutting steel and aluminum, the side rake should be about 12° and the back rake should be about 8°. For cutting brass, the rake angles should be much less, or even 0°.
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