Seb, Yes, I know what an encoder is and why. I use Yaskawa motors and drives that have indexes. I do not use steppers. The older m5i20 driver implemented index homing quite nicely. The index makes sure the home is very accurate. Before the m5i20 driver is removed, it would be good to have the new hm2 drive function correctly and in a similar manner. Not being a programmer, especially a vhdl programmer, I have to leave that up to others, for whom I am quite grateful. I can, though, debug pretty well because if something can get messed up, I can certainly do the messing.
If I have to change to the 'm' version .bit file, so be it. I have one commercial installation of EMC2 with an m5i20 board, and am hoping for more. When my test system is up and running again, I will be happy to donate it as an 'example' for inclusion in the distribution. So, at this point I just need to figure out how to get index homing working with the hm2 driver, if it is indeed possible. Thanks again to all the developers and contributors for all the hard work. Noel. 'Roguish' -----Original Message----- From: Sebastian Kuzminsky [mailto:s...@highlab.com] Sent: Tuesday, May 26, 2009 9:27 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Mesa 5i20 and hm2 noel wrote: > What do you mean by 'hm2-servo configuration'?? "hm2-servo" is one of the sample configs shipped with emc2. If you installed one of the 2.3 debs it's in /usr/share/doc/emc2/examples, if you checked out the CVS it's in configs/. > Is this different from a 'stepper' configuration? Yes, the sample configurations in hm2-servo/ use servo motors, as opposed to the configs in the adjacent hm2-stepper/ directory, which use stepper motors. > Why and how would index homing work in one and not the other?? Index homing is a feature of the rotary encoder mounted to the motor shaft of a servo motor. A servo is not a servo without an encoder. The encoder provides position feedback to the servo controller. Stepper motors do not (in general) have encoders; the discrete motion of the motor itself acts as the position transducer. Some configurations use non-rotary encoders, and some use encoders in conjunction with stepper motors. While these kinds of system csertainly should be doable, I've personally never done it, and neither of the two hostmot2 sample configs is set up to deal with it "out of the box". -- Sebastian Kuzminsky "Like most small parts, they are concrete-soluble: you drop them once, they're gone forever." -- John Bush ---------------------------------------------------------------------------- -- Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
