On 22 April 2011 05:11, Robert Pabon @ Corse USA <robertpa...@corseusa.com> wrote:
> But I don't know much about motion control cards. How generic are these > things in terms of pairing them to servo amps? If the servo amps take a +/- 10V signal then there are a number of ways to control them with EMC2. Be aware that not all amps work with all motors, though. There are a number of possible feedback systems, some rather proprietary. Even a simple three hall sensors system can be set up in a variety of ways. (There are 48 possible combinations, but only a few are actually used in practice). > about software, if I buy something like a galil card on ebay will I need > driver software and is that available somewhere? Much better to buy something from the "supported hardware" list. http://wiki.linuxcnc.org/emcinfo.pl?EMC2_Supported_Hardware The "EMC2 Way" is to use dumb hardware and do the calculations and feedback in the PC. You could use step-direction servo drives as suggested earlier, but that rather goes against this, as you need to do the tuning in the drive (and often with a Windows-only special utility). Both the Pico and Mesa systems fit this paradigm, but so does any driver controlled in torque-mode by an analogue or PWM signal output by EMC2. If the motors have tachos and the drives are velocity mode, though, it is probably best to use them that way. > I have thought about the Mesa cards, but I honestly don't know what all I > would need to buy or what I would > need to configure one. It depends on your motors' voltage and current requirements. Mesa do at least two drives for Brushless motors, the 7i39 and 8i20 (just Google them) There is an EMC2 software component that can take almost any form of motor feedback and convert it to almost any form of amplifier drive. It is a complicated subject. I started to write a Wiki page to try to clarify it all, but got distracted. http://wiki.linuxcnc.org/emcinfo.pl?BLDC -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ Fulfilling the Lean Software Promise Lean software platforms are now widely adopted and the benefits have been demonstrated beyond question. Learn why your peers are replacing JEE containers with lightweight application servers - and what you can gain from the move. http://p.sf.net/sfu/vmware-sfemails _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
