Kirk Wallace wrote: > On Sat, 2008-02-09 at 18:51 -0800, f m wrote: > >>Rob, >> >>Let me clarify a bit. The application is for a coil >>winder on a non round form. The form will be directly >>attached to the motor shaft. I need to velocity >>modulate the speed of the A axis as it goes around >>corners in order to help maintain constant tension. >>The test setup I'm using is a stepper motor with a >>piece of tape on it to indicate position. There is no >>actual machine yet, I wanted to make sure this motion >>is possible before building anything. The only >>physical limiting factor at present is the motor >>inertia itself. >> >>The problem is not that the hardware is loosing steps, >>but that EMC is causing following errors. > > > For my own education, I am used to stepper systems not having feedback > which would be required for EMC2 to fault on following errors. How are > these errors being indicated? > The stepgen task knows when it can't get enough step pulses out due to insufficient interrupts at the BASE_PERIOD, and it's difference count between commanded position and actual position based on steps issued exceeds a certain limit. It is simulating in software what a servo would do in physical hardware.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
