304 SS, having trouble with carbide tools chipping, haas tm1 mill

Hey guys,

#1-I have a simple part I'm running on our little tm1 haas tool room mill. Probably not the best machine for stainless but its faster than manuals. Its 304 stainless angle iron. It has 7 holes, 6 of them are drilled using hss and cobalt drills, they are doing fine. The 7th hole is interpolated after a pilot hole of .312 is drilled, then it interpolates a .781 hole using a .562 solid carbide 4 flute end mill (helical at Z-.025/pass, 8 passes) . SFM is 125, and feed is .002 per tooth. I know your going to say its slow, but this machine is small and has no enclosure. I am running flood coolant. I could turn the sfm up to 400-500 but im not sure it would help the the problem. After 35 holes the tips and flutes are chipped.

#2-I also need to countersink 4 of the .265 holes @ 82 degrees to a dia. of .5, so I bought a .5 carbide countersink... I ran it at 150 rpm with a feed of .002/rev. Same issue, but only after 10 parts there are noticeable chips in the carbide. The tool does wobble just a little during cutting, which I think is odd since I have a good rigid setup...

Id appreciate any help available

Thanks,
Tap