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1- Countersinking, Counterboring, and Spotfacing - Overview
Countersinking, counterboring and spotfacing are machine operations that modify the entrance of an existing hole, usually for seating a screw or bolt. These operations are performed on machines like a drill press, engine lathe, or milling machine. Each of the operations, although similar, employ different cutting tools for the different applications. Countersinks, counterbores, and spotfacers are manufactured in carbon steel, high-speed steel or carbide . These cutters perform best when they are lubricated and operated at 1/4 the calculated RPM. Chattering must be avoided. Chattering is usually caused by excessive speed, improper feed or non-rigid setup.

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