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used to crank the feed override to 120% on roughing passes, now I baby it at 80%
For my first 3 years on the Haas VF2 at our plant in Modesto I was always pushing the feed override up to 120% on roughing to try and beat cycle times, but I went through 4 insert corners in a single week on some 4140 last month. So I switched to running 80% on the first pass and only bumping it up once I hear the cut smooth out, and my tool life has probably doubled. Anybody here got a rule for when they trust the override versus when they just leave it alone?
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evan_morgan8112d ago
My buddy Dale runs a older Okuma lathe at a shop down in Ceres and he had the same deal go wrong on him. He kept the override pinned at 125% for months on 4140 and could not figure out why his insert costs were eating his bonus, then one day his setup guy watched him run a part and told him he was basically burning the coating off on the first bite. Dale started leaving it at 85% until the spindle load leveled out, then easing it up maybe 5% at a time, and he swears his corners last almost three times as long now. He told me the sound is the giveaway for him, once that chatter goes away he knows the cut settled in and he can push it. What he does not mess with is the finish pass, he leaves that alone no matter what.
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