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I finally listened to old Pete about flipping my roughing passes
Pete the night shift lead told me to run my first pass at 80% depth of cut instead of babying it at 30%, and after trying it on a job last Thursday I stopped chattering and finished the part in half the time, anyone else ever get advice that went against everything you thought?
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robin_roberts843mo ago
Old Pete knows his stuff, lol. I had a similar thing with feeds and speeds where I was always way too conservative because I was scared of breaking an insert. Turns out the machine and tooling can handle way more than you think once you actually let them work. Chatter is usually from not pushing hard enough, not too much, so that 80% rule is solid for roughing. Feels wrong at first but the finish time drop is real.
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the_nina3mo ago
Old Pete is basically a legend at my shop for stuff like this. I had the same fear of pushing a cut too hard, (you know, that voice in your head saying you're gonna snap the tool) until I tried taking a heavier depth on some 4140 and it just ran smooth as butter. The chatter completely vanished, and the surface finish was way better than my wimpy passes ever were. Seriously, once you trust the machine's rigidity and the insert's geometry, it's like a whole new world of speed opens up. It feels backwards but the numbers don't lie, especially when you're watching the cycle time drop like a rock.
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