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Vent: everyone says never turn the feed up on 6061, but I did it anyway on a 4 inch face mill and it saved the job
Fought chatter for two days on a run of 200 brackets for a guy in Modesto, so I jumped the feed from 40 to 90 ipm and the finish came out clean. Anyone else think the old 'slow and steady' rule for aluminum is mostly passed down habit, or did I just get lucky on this one?
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park.tara1mo ago
Man, I feel you on the two days of fighting chatter, that stuff will wear you down to nothing. Everyone treats the feed and speed chart like it came down from the mountain, but half those numbers are written for old machines with way less rigidity than what we run now. You bumped it from 40 to 90 and got a clean finish, that is not luck, that is chip thinning doing its job. When you feed hard enough, the cutter bites in and stops rubbing, and rubbing is what makes the noise and the ugly finish. Slow and steady sounds safe but on aluminum it often just means the tool sits there and polishes the same spot until it work hardens. Good on you for trusting your gut instead of the chart, 200 brackets is a lot of parts to scrap.
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