This isn't a step/dir drive. Maybe my great drawing ability will help.. http://electronicsam.com/images/matsuura/20170124_140142.jpg
This is a conventional servo setup with linuxcnc closing the pid loop. sam On 1/24/2017 1:43 PM, Mark Johnsen wrote: > Actually, there are a lot of servo's like this (w/ step and direction). > But, cost comparison is the issue. > > Omron and Panasonic servo's only accept step and direction (the ones I > looked at) and you can probably get them off ebay for a decent price. I > had once used Omron and was actually complaining they didn't have a +-10Vdc > interface and only took step and direction. I think one reason is the > Omron's are designed to be used w/ a step and direction output from their > PLC's, that historically didn't do analog servo control, at least from the > brick versions. I always wondered why they just didn't add the analog to > the servo drive, but oh well. > > Also, here's a brand that BeachBumPete (from the IRC) used on his > Cincinnati mill retro that accepts step and direction: > http://www.dmm-tech.com/ > > I haven't used them, no affiliation w/ any of these, but the dmm guys also > have a lower cost servo i just saw, DYN2 AC Servo Drive is step and > direction and analog input... > > Chinese servo's from Alibaba or a place like salescnc.com have step and > direction servos: > http://salecnc.com/catalog/Delta-Taiwan-Servo-MotorDrive-Set-400W-3000RPM?osCsid=du1blviq6dlbi02nscik0akre1 > > While that $350 price is high for a stepper solution, it's waaaayyy cheap > for a servo drive and servo motor combo (with cables). For Kollmorgen > servo's you're looking at a couple hundred bucks just for the cables!!! > > I think the bottom line is that the servo pricing hasn't come down like the > bare-bones stepper motor and $50 stepper driver pricing. If you are cost > conscious, steppers are the easier route. In Gene's case, to match the > cost competitiveness, he would need to shop ebay for the 'right' deal and > those don't come by everyday. > > Good Luck, > Mark > > > On Tue, Jan 24, 2017 at 11:17 AM, Andrew <pkm...@gmail.com> wrote: > >> 2017-01-24 19:37 GMT+02:00 sam sokolik <sa...@empirescreen.com>: >> >>> PWM/dir though the bob. (these amc drives instead of +/-10v take >> pwm/dir) >> Ah, so convenient. We could save a lot on 7i77's if all servo drives were >> like this ) >> >> Andrew >> ------------------------------------------------------------ >> ------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
