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.
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