On 03/25/2015 12:45 PM, Leonardo Marsaglia wrote: > As I have seen on many machines including the Mazak that we have here, the > servo systems close the velocity loop within the servo drive, and then the > CNC applies a voltage to control the velocity of the motor based on the PID > of the position loop. > > You should check this out : http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Combining_Two_Feedback_Devices_On_One_Axis
There used to be a web page that described dual feedback on one of the big machines at Stuart Stevenson's MPM shop and had a bit of history of how they arranged to do that, but I can not find it now. They used a linear encoder for position feedback and a shaft encoder on the motor for velocity feedback. (Anybody know where the descriptive page with photos, etc. on that has gone to?) Jon ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
