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Finally hit under 0.001 tolerance on a 3D contour after 3 scrapped parts this morning
I noticed most guys at my shop skip the spring pass on the last finish cut and wonder why their parts come out 0.002 off, so has anyone else found that one extra pass saves you from redoing the whole setup?
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claire_walker20d ago
Started skipping the spring pass once and ended up with a 0.003 error on a critical radius, never again. Honestly that extra pass saves more time than it feels like it costs, especially when you're already buried in chips.
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claire_walker20d ago
Oh come on, a 0.003 error on one radius isn't the end of the world. You're acting like the part blew up on the machine. I've skipped spring passes a hundred times and maybe once had to touch up a dimension by a thou or two. That's way less time wasted than an extra pass every single time on every single part. If your setup is rigid and your tool is sharp, that spring pass is just burning cycle time for no reason. I bet you're the same guy who roughs every feature down to 0.010 before finishing too.
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paigep2019d ago
Honestly 0.003 on a critical radius is not the end of the world unless you're working aerospace or medical where prints are locked to the tenth. I've seen guys freak out over a half a thou on a part that's getting painted anyway. If your setup is solid and your insert isn't beat to hell, that spring pass is just extra cycle time for no real gain. A tenth is a tenth but at my shop we got a guy who blueprints everything and still has to bump offsets half the time. So yeah, maybe it saves you sometimes but acting like it's a rule for every single part is overkill.
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