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Using harvey tools 1/16" coated, .01 CR, stub flute length endmills. Having to finish a very shallow slot up against a .09" tall wall.
I'm only allotted .0005" taper on the wall and they seem to be wearing prematurely. I'm holding the tool in a MX-06 mini chuck and I measure about .0003" runout at the tip.
I've tried the High speed approach (light, fast, and air blast) and the slow and steady with coolant. The material (4130) is hardened to 45Rc. I've been cutting full depth with a .0002 finish pass and start to get taper after just a few parts (maybe 60" of cutting).
I have tried Harvey's speeds and feeds...
I can Message someone the file if anyone would like to take a crack at it.... Simple geo, just dunno if I can attack it another way.
Thanks in advance
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