Finally got a clean finish on that tricky 6061 part after messing with the feed rate

Kept getting chatter marks on a deep pocket job for a local shop in Dayton. On a hunch, I dropped the feed from 80 IPM to 65 and bumped the spindle speed up by 200 RPM. The finish came out smooth as glass on the next run. Anyone else found a sweet spot for aluminum with a 3/8" carbide end mill?

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