On 10 April 2013 15:01, Daniel Rogge <dro...@tormach.com> wrote: > Running LCNC 2.5, copy the sim/axis config to your local configs, then change > the max_acceleration for axis 0, 1, and 2 to 1.0 (previously 100): > > MAX_ACCELERATION = 1.0
> (1" square with rounded corners) > G90 G54 G20 > G64 > G0 X0 Y.25 Z0 > G1 Y.75 F50 > G2 X.25 Y1 I.25 This is not the same test, as far as I can see. For an arc move the acceleration is v^2 / r, or put another way, the max velocity in an arc is sqrt(a * r) So, in this case, with a 1/4" radius and a 1"/s^2 acceleration the max velocity possible is 0.5"/s or 30in/min. So, you would expect some slow-down on the corners, but not as much as is being seen. The next limit to consider is that LinuxCNC will always try to stay within its "stopping distance" due to limited lookahead. The quarter-circles are 0.39in long. To stop at the end of that path segment the entry speed has to be less than 52in/min so the limit isn't there. I think that there are two issues being reported here. The first is that arcs run slower than lines, and I think that might be due to the acceleration limits. The second is a speed glitch passing between line segments and arc segments. This remains unexplained, and I see it in sims too. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
