Regrind Instructions for Your Cool-Tips for Cast Iron
Cool-Tip for Cast Iron
Use a diamond Grinding Wheel with a grit size no larger than 180 mesh. A Green Silicon Carbide Grinding Wheel should not be used. It will produce a rough cutting edge on the drill-points and will quickly dull.
Use a Flood Coolant to prevent tiny heat check (small slits, cracks, or chunks) which weakens the cutting edge.
In a rigid setup, grind the 120deg. included angle with a 10deg heal relief angle. The grinding should remove a minimum amount of material but enough to produce a clean edge.
The web should be thinned to a point. This can be done by offhand grinding
by an experienced operator.
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Yelm, WA. 98597
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