Well I haven't been doing this quite as long as everyone else but to be honest I would say that there is too much tool contact, too high of an RPM, and too little feed rate. Granted you most likely considered this factor.
If you can get this shop to buy them, try a VNMG430.5 which has a .007 nose radius. Max Depth of Cut should be around .03 to .07, RPM 1500 and Feed at .006 IPR for Roughing and leave .007 for finishing.
For Finishing a VNMG 430 with a nose radius of .004. RPM 1200, at .0025 IPR.
If this helps great, if it doesn't hopefully it will help someone.
BTW: Flood Coolant will help. Plus I noticed that no one asked what material this is, or I can't read LOL.
Cheers!!!!
Toby D.
"Imagination and Memory are but one thing, but for divers considerations have divers names"
Schwarzwald
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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