Dave wrote: > True, but even little Nema 23 steppers have little usable torque beyond > 800 rpm unless you go with a high voltage stepper drive (which the G540 > is not). > > Larger Nema 34 steppers are pretty useless beyond 600 rpm or so. I used to demo my mini-mill with Gecko 201A drivers and some old, round NEMA 34 steppers. I was running 90 IPM with the motors spinning at 1440 RPM. It was quite awesome! > Why do > they use such finely threaded leadscrews? I would think that 10 tpi > would be more reasonable. > I think they use the fine thread because you can get 1/4-20 threaded rod cheaply. But, it is pretty awful for a positioning leadscrew. It does allow use of smaller motors, though, for CNC.
Jon ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
