Advanced Drilling

Peripheral wear determines tool life


Carbide drills require higher accuracy than high-speed steel drills. Therefore, when regrinding, NC grinding machines are generally used instead of conventional grinding machines. In general, the drill’s flank faces and web thinning are reground, and to complete the process the cutting edge is honed. For solid drills, regrinding can be usual undertaken approximately 20 times, while for brazed drills, the length of the carbide insert restricts the number of regrinds.


After several regrinds the flute length shortens and the diameter decreases slightly due to the back taper.


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Regrinding methods for the three rake geometry (carbide drills)