Drill Bit Questions

The black oxide coating is kind of like Teflon in a frying pan or chrome on your bumper. It is like Teflon in that it allows the metal being drilled to slide rather than stick allowing the built up heat to be carried away in the chip rather than stay in the bit. It also helps resist corrosion better than plain steel.

Roger Shoaf

About the time I had mastered getting the toothpaste back in the tube, then
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