I'm finish machining a 1/4 Radius in an ID of a 6061 Alum part that has been roughed with a 3/4 EM. The total depth of the pocket is 2 1/2 inches. I typically have a chatter problem with deep pockets of this sort. I am using a 1/4 dia Harvey Tool Long Reach relieved shank 3 Flute EM. the RPM is 1650, the speed is 10 ipm, the depth of cut is .025. Can anyone recommend an approach they use to deal with deep pockets such as this sans chatter? The geometry I am driving the tool with is a .127 rad.
Thanks