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-Prin >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 -- "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
