Have to completely disagree here.
I have a Taig mill with a 20TPI leadscrew driven by A G540 from Mach3. I limit my rapids to 60IPM which is 40Ksteps/sec Mach3 has had a max steps/sec of 45K for about a decade. Mach3 now generates up to 100K steps/sec, So it 20K steps/sec is nowhere near the limit. That said I not sure what LinuxCNC's limit is though. Cheers, Peter. --------------------------- Peter Homann http://www.homanndesigns.com/store On Tue 17/04/12 11:28 AM , Jon Elson wrote:Kirk Wallace wrote: > > > Most of the components on the G540 are SMT and too small to have > markings, so I could only guess about what they are. I have some close > up pictures of the area in question, but my camera's cable has woken up > and run off somewhere. I'll post the pictures when I get this sorted > out. > Most of those tiny parts have a 2 or 3 letter code that can be looked up to tell what part it is. > On the other hand I'm thinking I'll need to deal with the G540 as it is. > > I'm still concerned that the G540's 10x microstepping would put it out > of the parallel port arena. It seems a 5i25 would be more appropriate, > plus taking into account other savings the 5i25 might provide, might > make it cost similar to a PCI parallel port and buffer board. Trying a > Pluto-P is on my to-do list. > Right, 10X microstepping on small motors with fine-pitch leadscrews end up needing a fast step rate. Assuming 2000 (micro) steps per rev, and wanting maybe 30 IPM on a Sherline or Taig with a 20 TPI leadscrew, that is 30 * 20 = 600 RPM or 10 RPS. 10 RPS * 2000 = 20,000 steps/second. This is doable with software stepping, but near the limit. And, the step timing becomes jumpy at the high end. It is barely humming for a hardware step generator, however. They can easily go ten times faster and more. Well, maybe you will have luck with the Pluto, but others have had problems with it. 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 [1]" target="_blank">http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users [2] ------------------------- Message sent via Atmail Open - http://atmail.org/ Links: ------ [1] http://p.sf.net/sfu/Boundary-dev2dev [2] http://webmail.homanndesigns.com/parse.php?redirect=https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ 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
