I had asked this question once before and did not realy get a good answer,Maybe I just did not explain correctly.So Iwill try again. I have a 4.00 thk. x 5.375 x 7.125 aluminum block(6061)I need to machine a 3.500 deep pocket ..03 rad between floor and walls,need a 125 finish.What I am using is a multi-master .750 Dia. 3 flute head mounted to a 4"lg. bar to rough out the pocket,Depth of each cut is .250 dp. and I am ramping in.Feeds 33.00ipmand rpm is 4500. leaving .010" on the walls and .005" on the floor.Forgot to mention the pocket has .500 rads in the corners.then I come back with a 1.00" dia. 3 flute Dataflute endmill to finsh. I did try indexable end mill ,But way to much chatter.Can anyone give me some advise on speeds feeds and if this is the process to use?
Thank You in Advance,