![]() ![]() Sharpening tools made of SK8M cobalt high-speed steel requires a 25% reduction of all parameters or the use of Borazon (boron nitride) grinding wheels. The sharpening of bits made of tungsten-molybdenum steel should be carried out at 20-25 m/s, and the stroke should not exceed 0.03 mm with manual shift. The higher the alloy content of high-speed steel used to manufacture a drill bit, the more precise the sharpening process should be. These negative phenomena deteriorate the quality and performance of drill bits. An excessive temperature increase in the course of sharpening can cause grinding fissures, microcracks, high edge tempering or even their secondary hardening. Maintain the symmetry of the chisel edges, aiming at restoring their factory shape.ĭrill bits are correctly sharpened when procedures are conducted with the correct sharpening and cooling parameters, so as not to cause excessive heating of the chisel edge areas. In extreme cases, the bit may simply break.īefore proceeding to sharpen, carry out a visual inspection of the blunt bit, and then remove all fissures, chippings and cracks from the chisel edges.
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