Sterling Dump

[will916691]

running at 10,500 rpm that endmill is going to heat up fast you really need some coolant the math for speeds and feeds is tricky it may look good on paper but not work so well in the real world I would try and cut your spindle down and your feed down as well and see what that does for you also some oil to keep your work cool would sure help also how well is you part clamped down? if you tap on it in the center does it sound hollow? did the sound of the cutting change before it snaped? just want to make sure its not a issue with chatter

Will