Stephen Dubovsky wrote: >> 15 inches/second-squared? No surprise. I usually use between 3 and 5 >> >> on my machines. >> > > I have a Supermax YCM30 (a bridgeport 2J clone) w/ servos that I just tuned > to 30in/s^2 no problem. Don't have the file infront of me but I think I > have my 4'x4' stepper gantry mill at ~100in/s^2. 3-5 seems glacial. > Anyone else care to comment on what they are using on bridgeport sized > machines? > Yup, with servos designed for low angular inertia (long and skinny) and powerful servo amps, you can get a lot more acceleration than with old NEMA 42 stepper motors. I have mediocre motors and wimpy servo amps on my Bridgeport retrofit, but the limiting factor is the 3/8" XL drive belts, which will snap if I turn up the acceleration. (These axis drive assemblies came from a PCB drilling machine which had a very low mass table. I'd have to change the sprockets to use wider belts.)
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