On Wed, 4 Apr 2012 23:44:26 -0400, you wrote: >On Wed, Apr 4, 2012 at 3:00 AM, propcoder <[email protected]> wrote: > >> turbocnc have such parameter as starting velocity. This is velocity, at >> which motor can instantly run (I think it actually comes to controlled phase >> in time without loosing a step). OEM solution had acceleration setting of >> 600mm/s2. The same setting on LinuxCNC makes machine too slow. Raising it to >> 1500 makes good speed, but too much vibrations. > >Is it possible that your old controller used S shape speed profiles, >i.e. it started by limiting acceleration to 600m/s2 but then used >higher acceleration? I seem to remember that LinuxCNC uses >trapezoidal profile, i.e. the initial acceleration is never exceeded, >and the speed linearly ramps to max speed
More likely the look ahead/cv in LinuxCNC which IMO is poor in comparison to Mach or commercial controls I've used. 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
