Hi Kenneth, Kenneth Lerman wrote: > I don't consider most of what you have listed as a specification; I > consider it to be mostly a list of parts. > > I stand corrected. I agree with what you say say bellow but I did not simply want to come here and ask questions without indicating that I did some basic homework. Some would probably respond, justifiably, with directing me to commercial engineering outfit to design (and possibly build) it for me if I did not start with research on my own. I should call that a starting point from what I learned from EMC website links, this mailing list, and other sources, instead of specs.
> Specifications are things like: > > speed: 100 cm/minute > acceleration: zero to full speed in 100 msec > cutter diameter: 10 mm > spindle speed: variable in a single range to 20,000 rpm > > x, y, z accuracy: .1 mm > x, y, z repeatability: .05 mm > > 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. > ----- > > 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. > 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
