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.