Originally Posted by justgary 
By the way, Bluefin, to me every end mill is an expensive one. I'm too dumb to order them in quantity, and when I break one it means I go without that size or shape until somebody has a sale on them again. If I actually made any money with them, it would be very different. Besides, I have only broken them because I'm an idiot, and I figure I just *have* to outgrow that some day...
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Well, to me I figure I could go to CNC school for two years and after being taught I would probably crash "less" tools than I do by tearing the wrapping paper off the new machine and hitting the ON button. So you either pay tuition to a school, or to Enco and MSC. So far I have learned a LOT in just a few weeks and the "tuition" has not been as much as what the school would have been (so far)
So, a .125" Atrax single end mill on sale for $5.00 getting broke off (did that) is not expensive to me. But last month I did not set a safe rapid Z height high enough to clear the head of a allen head screw and when I hit cycle start it tried to mill it off with a brand new $50.00 three flute aluminum finisher. That new end mill never even touched a piece of aluminum before it's teeth were ripped off by the bolt head.
