On 04/12/2014 03:30 PM, Rod Fitzsimmons Frey wrote: > Yes indeed, as part of my tuition costs for this field I bought Gecko 320x > controllers and DC servos, as a package from Keling. Never again. > Practically undocumented, disappointing support from Gecko, unanswered > forum questions, etc. etc. Gecko is VERY good with steppers, but I think their step servo is kind of the unwanted step-daughter. > I have a Mesa 5i25 doing step generation along with a 7i76 for I/O. I may > be seeking advice on debugging (I really am a newb here) if the first two > strategies (adjust servo thread frequency; try new TP) don't pan out. > OK, in that case, I think you CAN wire the encoders back to the mesa board so you can plot the servo response with Halscope. I made a board for this, it makes an opto-isolated copy of the encoder signal for the Gecko drive, and powers the encoder from our stepper controller board and then feeds the original signal to the stepper controller. This is a bit different than the Mesa system, where LinuxCNC is within the step generation loop, so making the switch between "open-loop" step generation and closed loop with an encoder is quite easy. I think you can do this with Mesa as well. By putting the positioning loop into LinuxCNC, it is possible to get much better control of the servo, programmable following error limits, etc.
Jon ------------------------------------------------------------------------------ Put Bad Developers to Shame Dominate Development with Jenkins Continuous Integration Continuously Automate Build, Test & Deployment Start a new project now. Try Jenkins in the cloud. http://p.sf.net/sfu/13600_Cloudbees _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
