On Sat, Nov 15, 2008 at 1:26 PM, Jeff Epler <[EMAIL PROTECTED]> wrote:
> You can use "step+direction servos" hooked to the parport with emc, but > this has two big drawbacks. > > First, on dumb I/O like parport, you're limited to fairly modest step > rates. Taken together with the 1/10 microstepping of geckodrives gives > a very limited top speed. (if you use hardware step generation like ppmc > or mesa, then the speed limitation isn't likely to be an important > consideration) > > Second, you give up the ability of emc to "close the loop"; you're stuck > with whatever the driver does in terms of deciding when to fault; you > have to adjust trimpots instead of values in software; and it may be > difficult to get a good reading for following error during the tuning > process. > > Regarding the step & direction servos ... Having worked with PIC microcontrollers in the past, I was interested in maybe constructing the dspic-servo board (which uses the type 2 stepper signals). In your opinion, would I be better off with one of the other options you offered? Any feedback is appreciated. Thanks! ------------------------------------------------------------------------- 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
