On Thu, 5 Apr 2012 17:48:03 +0300, you wrote: >I have seen such S-shaped velocity curves like this: >http://www1.adept.com/main/ke/data/controller/smartmotion_developer/images/S-curve%20profile_575x281.gif >which is even slower than simple speed curve in case main sloap is the same. > >In the picture attached 1st curve is like turbocnc does, 3rd is simple >(LinuxCNC), 4th is S-shaped and 2nd is like it might look for stepper motors >(provided that velocity starts from zero) because their torque at low speeds >is higher. > >I remember that OEM controller has such parameters like axis starting >velocity, axis acceleration, and some parameter for common acceleration when >several axes are moving simultaneously in curve.
There is a parameter for LinuxCNC ini file that does velocity for combined moves. It didn't used to get put in by stepconf. Whether it does now, or would help, I don't know. I do know that using identical parameters in Mach and LinuxCNC does not give identical results - Linux is slower and much less smooth. Mach has same straight line accel. There was a version called MachX IIRC with S curve accel and there is talk of it being implemented again, but I'll believe it when I see it. Steve Blackmore -- ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
