Gene, The Polulu drivers use 0.10in pin spacing by 0.5in. spacing on the rows. Don’t ask me how I know.
Alan > From: Gene Heskett <ghesk...@wdtv.com> > Date: November 5, 2015 at 6:37:50 PM PST > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Those $16 Chinese TTS tool holders > > > 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 > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
