there are a ton of variables when learning the trade, no book out there knows how your machine will react to different situations, practice=perfect. as far as the doc goes, 1.5-2 is way to much unless you have very small stepovers, imagine a full diameter cut with a .5 endmill .75-1.0 deep, that would snap the toool right in half, so again practice=perfect, the less the stepover the deeper you can cut as, but i never go beyond .75 diameter depth, like with a .5 cutter no deeper that .375, just a rule of thumb i was once taught and its worked well, another one is when reaming the reamer should be twice the feed and half the speed of the drill, good luck. 1" * 2" = 2"=that guys stupid, and its rpm not rpm'S |