Gene, I uploaded some pictures to Flickr, to show you how I have mine done: https://www.flickr.com/photos/46689581@N03/albums/72157660780465122
On 11/05/2015 08:37 PM, Gene Heskett wrote: > On Thursday 05 November 2015 20:57:10 MC Cason wrote: > >> On 11/05/2015 12:22 PM, Gene Heskett wrote: >>> On Thursday 05 November 2015 12:39:47 andy pugh wrote: >>>> On 5 November 2015 at 17:04, Gene Heskett <ghesk...@wdtv.com> wrote: >>>>> Yeah, I know, a miss-cue in a contact will probably blow the >>>>> driver, but ice-cubes seem pretty dependable. All this switching >>>>> would of course take place with the drivers enable line off, so >>>>> when it becomes enabled the relay has had time to close. >>>>> Conversely, at stop time, leave it enabled for long enough to >>>>> bring the motor to a solid stop, then disable, and drop the relay >>>>> 100 ms later. >>>>> >>>>> Comments on this idea? >>>> Drivers suitable for a Nema11 motor are probably cheaper than the >>>> relay, so this might be a false economy. >>>> http://www.ebay.com/itm/1PCS-A4988-Stepper-Motor-Driver-Module-3D-P >>>> rin ter-Polulu-StepStick-RAMPS-RepRap-/221921771119 >>> Thats ok, but that driver bothers me, how about this one? >>> >>> <http://www.ebay.com/itm/5PCS-DRV8825-stepper-motor-driver-Module-3D >>> -printer-RAMPS1-4-RepRap-StepStick-/201114247831?hash=item2ed357e297: >>> g:gy8AAOSwWnFV94cl> >>> >>> Which seems to be a higher voltage tolerance version. >>> >>> But, does anyone supply a motherboard that would mount at least 5 of >>> those? My google-foo seems to be broken, but if these are used in >>> 3d printers, I'd certainly expect to see a method to make a whole >>> bank of them useable. 4 wide, maybe even 5? >>> >>> Cheers, Gene Heskett >> Gene, I just built a electronic rotary table with one like one of >> those, but I got it here: >> https://www.pololu.com/category/154/drv8825-stepper-motor-driver-carri >> ers-high-current >> >> I didn't think that $6.80/each in a 5 pack, was too bad, >> considering what other options would've cost. It's being controlled >> by a Teensy 3.2 (ARM Cortex M4), and It's controlling a NEMA 23 >> Stepper, and It just barely gets warm. Current is set to 1A. >> >> Pololu's website has a truth table that shows how the microstepping >> pins get connected. On my teensy 3.2, I have the microstepping pins >> tied to 3 digital pins, so I can adjust microstepping in software. >> The code is still WIP, and I'm still tying all of the individual >> pieces together, but on the bench it's working nicely. > Looks like it could be socketed into 2 adjacent 16 pin dip sockets. > That, for the most part, solves the "bank of them" problem. Now if I > could find a suitable motor that wasn't $40/copy. Still looking on that > point. > > Thanks. $8/copy with the header pins already soldered in seems > reasonable. > > Cheers, Gene Heskett -- MC Cason Eagle3D - Created by Matthias Weißer github.com/mcason/Eagle3D ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users