The smallest endmill I have used was "slightly" larger than this...at .015". I used a special air driven spindle to turn it at 30,000 rpm & that was still not quite fast enough in aluminium...70,000 rpm would of been more adequate. Copper...ballpark guess would be 60,000. on a manual brigdeport...very light cuts & slow feed an alot of luck...will probabally get you a few broken bits. Damn...that thing looks like it has quite the length of cut for how small it is...
but what the hell...give the thing a try...could be fun to see what you dream up
I have heard of bits even smaller than these.... .005" in dia. I find its amazing that they can even make the damn things that small....& if you look under a magnifing glass at them...they are perfect...
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