TAP SHARPENING, Conclusion

Flute grinding or spiral point grinding should also be done on a tap reconditioning machine or on a cutter grinder. Flute grinding wheels should be shaped with a diamond dresser of appropriate type to produce a rake face or hook face as required. Both chamfers and flutes should be ground carefully so as not to burn the cutting edges of the tap, careful grinding will also produce a smooth finish on the tap. Wheels of K or L hardness and 60-grain or finer should be used.