ok some valid points yes an end mill holder is a hole with a set screw in it. my night job is supervising 25 people and writing programs. I use very high speed machining techniques . I promise that if you spin an endmill in a collet half inch or larger at 10 k rpm and feed it 2-300 in a min you will find the weakness of the collet and that is it will pull out. I never said a collet was not for milling i advised caution when doing so and to use them for smaller items. I have enough experience in this matter to be certain this is good advice fellas :) -- jeremy youngs
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