On Monday 17 March 2014 14:34:34 Robert Ellenberg did opine: > > I think one can argue both ways John. Basically I just wanted to > > throw it > > > > out there and see if it sticks. :) > > > > You are of coarse correct because I can still set the F to what my > > machine can do, and running smoother is always going to be faster. > > Those little near stops of millisecond duration when turning a corner > > have been known to make the 24" steel kitchen base cabinet mine is > > sitting on dance a bit. > > Gene, to clarify a bit, the only reason we're seeing those velocity > humps is because we're pushing the path as fast as it will go. Since > the requested feed rate is far above what the machine config can > actually do, the feed that the trajectory planner produces is limited > by the maximum velocities of each segment. The trajectory planner will > never exceed your requested feed rate (other than by feed override), so > you won't see those humps at a reasonable feed rate. > > You might benefit from the "ramp frequency" setting in the new TP. I > talked about this in the forum > post<http://www.linuxcnc.org/index.php/english/forum/10-advanced-configu > ration/27368-new-trajectory-planner-testersprograms-wanted?start=130#444 > 74>, but basically, it reduces jerks by using constant acceleration > during short segments. If you set the frequency lower, it will smooth > more aggressively.
Something I'll not see until I switch to the 2.6.0 builds again. ATM I am concentrating on bringing the lathe back to usability so it can help machine the nut holders for ball screws in the mill. If PCW has the SPINx1's on the shelf, I should be able to make progress on that front by the end of this week. But I still have to remake the housing for all of it since the motor is now standing approximately 1/8" proud of the top of the box I made by cutting up the side of a bent UPS van box. Hopefully I have enough of that scrap left as it means new pieces for all the vertical members except perhaps the rear face which is well away from flying swarf. Nearly all the electronics are on the inside face of that panel, rigged as a tip out for easy access. But not today as we've several inches of new, very heavy snow to let the sun destroy before I'll expect the SPINx1's to fall out of my mailbox. That groundhog that saw his shadow on 2/2? He saw it again last Friday... If I find that rodent, I'll make crow food out of him. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
