[Theory]

Hello all,
so i am running inserts UNEU1307R-MI IN2504 (INGERSOLL) on a 3" facemill around 500 rpms with a .005 chip load. taking off about .06-.1 in one pass. I am having constant issues with one spot chipping out on a couple of inserts all the time and we are going through a ton of inserts. i may change cutters or inserts but not sure. This mill is kind of old and we are feeding to the centerline of the cutter then rapiding back. (i dont like it but i dont think its my biggest issue at this point.) what do you guys think as far as inserts or maybe having the part be off the centerline of the cutter? not sure. i dont think this nipple is effecting it. Its got a hardness level of around 55 rockwell.