i only have a few parts i've done this deep and i cant seem to get the hang of it.

on my finish pass i'm running a 1/2" 3 flute carbide tool, 2.75" stick out, DOC is 1.875", 40 IPM, 3500 rpm and i'm only taking off 0.005" oh and this is in 6061 aluminum and a 2" cut length on the tool. the part is very rigid.

sometimes it works and others times it doesn't and of course as soon as it gets some chatter the damn tool pulls out and wrecks my bottom plane.

any suggestions would be awesome

i working with a pcnc1100 series 3.

thanks guys

Carlos