> Numbers you quote here are better than what I'm hoping to achieve even > though I'll try to come as close as possible. .05 mm repeatability on > 1m run is probably hard to achieve with stepper motors without > positional feedback. It woild be interesting to know what others were > able to do with different mechanisms which was one of the questions.
Steppers properly set up are just as accurate as servos, just not as fast or powerful. If your looking to keep the cost down Gecko has a new driver coming out that will drive 4 axis for $299. You plug in a parallel cable to the parallel port and to the drive. The motors use a DB connector. It is limited to 50 volts. If your loosing steps with a stepper you don't have everything set up correctly. > > > ----- > > > > It makes no sense at all to specify the power supply and drives and > > then ask the question what motors should you use. The specifications > > should determine the motor sizing. Then the motor sizing should let > > you pick the drives and the power supply > > > > > > In a way that's true but one needs to start somewhere and I thought > that somebody with experience would be able to tell if I'm in a > ballpark or not. > > The reason I mentioned power supply is I'm not sure which way to go, > linear or switching. While switching PSU is good for computers and > electronics in general with almost constant power use, I'm not sure > about driving stepper motors with large current surges during > acceleration. > > Well, I go back to do more reading. For power supplies visit http://www.antekinc.com/ you can get the power and logic from one power supply. Very nice units... The steppers use a switching and the electronics use a linear. Also I used belts for my plasma cutter and there is no whipping at all at 500 IPM because the belts don't move. If the belt can carry the load from the stepper it is big enough. I used L section belt for the X and dual XL section for the Y gantry. I plan on replacing the XL with L as the L is much more resistant to stretching. Some photos here http://suburb.semo.net/jet1024/PlasmaBuild.html and you can learn how to make beer and wine... John > > > Ken > > > Thanks, > > -- > Rafael > > > ---------------------------------------------------------------------- > --- This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge Build the coolest Linux based applications with Moblin SDK & > win great prizes Grand prize is a trip for two to an Open Source event > anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
