2013/8/6 Viesturs Lācis <viesturs.la...@gmail.com> > 2013/8/6 Sven Wesley <svenne.d...@gmail.com> > > > > > The palette I'm going to use as a table is pretty heavy, and put a mould > > half on top of that. That's at least 100 kg moving parts, maybe more. > And I > > want at least 5 m/min transport. > > > > Max acceleration is what matters most for the motor. In my router I have > 7500 mm/min maxvel and 300 mm/s^2 maxaccel (it reaches max velocity in 0,4 > seconds, which is fine for me). > It requires 30N force to move 100 kg at 0,3 m/s^2. With a 5 mm pitch > ballscrews it would require 0.023 Nm of torque applied to the screw. > This calculation assumes no friction and other losses, so add 30-40% for > safety and then another 50% to make sure that stepper motor is not running > out of torque. It still is less than 0.1 Nm to move the machine itself > around. > IMHO milling forces have to be calculated to take them into account as well > as that might much bigger load than these 100 kg. > > I definitely do like those largest Nema23 motors - SY60STH86-3008B: > http://www.zappautomation.co.uk/en/attachment.php?id_attachment=140 > > At 60V/4.3 A and halfstepping they have something like 1.3 Nm at 1500 RPM. > And 1500 RPM with 5 mm ballscrew pitch will give 7500 mm/min velocity. > > -- > Viesturs > > Good writing Viesturs. My small Nidec servo's can keep up with the acceleration I have now and it makes the machine shake at short runs. I don't remember the acceleration config but it's just a fraction to max speed and the portal is around 80-90 kg.
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