No problem if the servo solution is a bit more expensive than the steppers, i do believe that i's the way to go for a more agile and useful machine! I need to understand a bit more about what means EMC has to 'close the loop'. I suspect a motor current readout would help to see how hard the driver has to try to achieve the required position? Funny I also found the same http://www.geckodrive.com/g320x-p-28.html and was studying its specifications, but i couldn't find a way this one would close the loop! You say that it could be simply connected to 2 lines of a parallel port? Even from the manual I can't find any evidence that the Gecko driver could be used for closed loop operation! Are there any better solutions? I suppose for pico or the FPGA controller (which I like for its potential to do very quick responses processed locally) I'll have to consult with their application engineering?
On Wed, Aug 10, 2011 at 2:28 AM, andy pugh <bodge...@gmail.com> wrote: > On 10 August 2011 07:52, Tobias Gogolin <usert...@gmail.com> wrote: > > Thanks Andy, these keling servos are sweet, how do I drive them? > > Which ones are you looking at? Brushed or Brushless? > > How do you want to drive them? The Keling page suggests that they work > well with Gecko and Rutex drives. > For example you could use > http://www.geckodrive.com/g320x-p-28.html > With the DC servos, and use step-dir pulses from a parport to drive > them. That doesn't normall give you closed-loop in EMC2 though, but > using velocity mode step generators, it can be configured to be. > > Pico systems do a range of parallel-port connected drivers (using the > parport for data, not step pulses) and have drives for both brushless > and brushed servo drives. http://www.pico-systems.com/motion.html > > Mesa also do a range of solutions, but all need a driver board that > plugs into the parallel port (7i43 $80) or PCI port (5i20, 5i22, 5i23 > $200 and up). You then plug in a daughter-board to drive the motors. > The 7i39 ($150 for two axes) would be a good fit for the Keling NEMA > 23 brushless motors. They have a range of drivers for brushed motors > too. > > Driving brushless motors can be a bit complicated... > > I suspect that all servo solutions will be rather more expensive than > your original eBay Stepper solution, probably twice as expensive. > > The NEMA23 servos probably won't work particularly well direct-coupled > to ballscrews, you will need to trade their much higher speed for > somewhat lower absolute torque, probably with a toothed-belt drive. > > -- > atp > "Torque wrenches are for the obedience of fools and the guidance of wise > men" > > > ------------------------------------------------------------------------------ > uberSVN's rich system and user administration capabilities and model > configuration take the hassle out of deploying and managing Subversion and > the tools developers use with it. Learn more about uberSVN and get a free > download at: http://p.sf.net/sfu/wandisco-dev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Tobias Gogolin Tel. Movistar (646) 124 32 82 Tel. Telcel (646) 160 58 99 skype: moontogo messenger: usert...@hotmail.com First Bitcoin Account: 1LCupcVd8HhAGyVhd3xayPpnQHeis7rAiV Blog: http://zeitgeistensenada.blogspot.com/ You develop Sustainable Ranch Technology at http://tech.groups.yahoo.com/group/SURA-TECH an Open Source Electric Motor/Alternator at http://groups.yahoo.com/group/Performance_Axial_Flux and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox ------------------------------------------------------------------------------ uberSVN's rich system and user administration capabilities and model configuration take the hassle out of deploying and managing Subversion and the tools developers use with it. Learn more about uberSVN and get a free download at: http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
