Hmm...I dug into this a bit, and it turns out the Arduino Marlin firmware doesn't really support true jerk limiting. What they call jerk is actually the maximum instantaneous allowable change in combined XY velocity (ie: going around corners). I'm pretty sure the "jerk" setting in Marlin can be approximated (likely with better overall results) using G64 with a tolerance.
Descriptions of Arduino/Marlin "jerk" limiting: http://forums.reprap.org/read.php?146,190628,191971#msg-191971 https://github.com/ErikZalm/Marlin/issues/305#issuecomment-10318472 Expand the comments too, where it is mentioned: "Evdz and me had discussions, because we both know jerk is a terrible name for this, because jerk is the change rate of acceleration. It should be renamed to turn-velocity or similar. But the name is to well known to change." Off to experiment... On 12/16/2013 9:50 AM, Viesturs Lācis wrote: > Araisrobo have implemented jerk limitation. I will forward you an email > from Yishin, there are some links to their source code. That email is more > than 2,5 years old :) > > Viesturs > > > 2013/12/16 Charles Steinkuehler <char...@steinkuehler.net> > >> I'm wanting to limit jerk on my 3D printer and see if it helps with >> print quality, but I don't see any way to do that. >> >> Digging through the documentation and list archives, it looks like the >> stock motion module doesn't support any sort of limit on jerk. Is that >> really correct? >> >> If so, does the new trajectory planner with arc blending have jerk >> limiting too? I may be switching to that sooner than I expected. :) >> >> -- >> Charles Steinkuehler >> char...@steinkuehler.net >> >> >> >> ------------------------------------------------------------------------------ >> Rapidly troubleshoot problems before they affect your business. Most IT >> organizations don't have a clear picture of how application performance >> affects their revenue. With AppDynamics, you get 100% visibility into your >> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics >> Pro! >> http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> > -- Charles Steinkuehler char...@steinkuehler.net
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