If you are using a high speed steel tap you don't need to worry about getting it too hot when you grind it. They are not carbon steel and do not respond to heat like a carbon steel does. It was made to replace carbon steel cutters so that turning speeds and drilling speeds could be increased to the point that a carbon steel tool would lose it's temper. I seem to remember an article about HSS wherein they claimed it would continue to cut at a red heat. GP