ARGH!!!! I've just broke my fourth 3/16 carbide endmill. I'm trying to cut slots clear through some 304 stainless steel sheet that's .130 thick in one pass. I'm using some scrap aluminum under the sheet and cutting about 0.140 deep so I'm going into the aluminum a little bit.
I'm calling it a night. What feeds and speeds would you use? Do I have to do the slot in two passes? Would it help to move up to 1/4" or larger endmills? FWIW, the endmills are all snapping off where the flutes end and the shank begins - no dulling no burning.
Karl