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Talked to a old timer at the shop who changed how I set my feeds
Ngl I been running CNC for about 8 years now and always pushed my feeds hard to get parts out faster. Last week this guy Jerry who retired from Boeing came by to pick up a part. He watched me run a job and said 'slow down, your tool deflection is killing your surface finish.' I pulled up the finish pass and checked with a micrometer and he was right on. He showed me his old setup sheets where he'd drop feed rates by 30 percent for the last pass. Tried it on a stainless job the next day and got the best finish I've ever seen off that old Haas. Anyone else have a old timer give you advice that actually changed your numbers?
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the_kim3h ago
Yeah that Haas spindle likes to flex just enough to ruin a finish if you're pushing too hard. @margaretk89, letting the tool breathe is exactly what Jerry was getting at, but it's also about letting the part relax a bit before the final pass. I've seen guys chase chatter for hours when all they needed was to back off the feed by 20 percent and let the DOC stay the same.
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