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 If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Get your SQL database under version control now! Version control is standard for application code, but databases havent caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
