For fast cuts and the greatest rigidity, use shorter end mills with larger diameters.Ball end mills, also known as ball nose end mills, are used for milling contoured surfaces, slotting and pocketing.A ball end mill is constructed of a round cutting edge and used in the machining of dies and molds.Roughing end mills, also known as hog.
Atmo, assuming garden variety steel like 1020 or something, you need to reduce your feed down to around.0003 to.0005 per tooth for an 18 end mill with a 12 loc.An 18 endmill with a 12 loc is a whispy affair.If you can rough out the pocket with a bigger cutter, do so.If you can use a stub length cutter, do so.
A better way to cut hard metals and hightemp alloys on swiss lathes i struggle with the speeds and feed rates for small ball end mills 0.03125, 0.040, 0.0625 when cutting our typical tool steels such as p20, a2, and h13.
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I am wondering how often bits go dull.Now i know it depends on a million things, but i bought 2 14 bits when i first got the xcarve, both 2 flute upcut, one steel and the other carbide.I did quite a few cuts with the steel one, a lot of deep big pockets, which wasnt the most efficient should have gotten a 34 cutter.All of the cuts were in wood, but when i did mdf, i think i ran.