Hmm...I dug into this a bit more, 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 in the last link, 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
signature.asc
Description: OpenPGP digital signature
------------------------------------------------------------------------------ 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
