Can you attach a G code program that uses G93 that demonstrates the issue you’re describing with your INI config file you’re using?
> On Jul 7, 2023, at 8:19 AM, Marius <mar...@mastercut.co.za> wrote: > > Have a look at this forum thread where all the testing was done and the > problem discussed as it was encountered. Everything that you mentioned here > was tested and the results are not always as expected. > > https://forum.linuxcnc.org/plasmac/49293-qtplasmac-with-fourth-axis-rotary?start=60 > > >> On 2023/07/07 16:03, Todd Zuercher wrote: >> The single line look-ahead is only a limiting factor when commanded g-code >> segments are shorter than what your acceleration settings can achieve the >> commanded speed in. For example if your machine is configured for >> 100in/sec^2 acceleration and milling at 90inchs/min it would be able to >> maintain full speed through g-code with segments a little less than 0.01 >> inch long without any slow down due to single line look-ahead. >> >> Don't be confused by the huge slow down potentially caused by not using G93 >> (inverse time feeds) when you should be for mixed linear/angular commands. >> That slow down is caused by the F feed rate being applied in degrees/min >> limiting the moves speed (a 10 degree move at normal F90 will take 6.7 >> seconds.) A move will always be limited by which ever is slower the move's >> F speed in degrees/min or distance/min. If a combined move's degrees moved >> is greater than the linear distance moved, then the feed rate of the angular >> move will be controlling the time of the move. Switching from inches to mm >> in your G-code could also have a big effect, making the F settings 25.4 >> times larger, and therefore the angular moves 25.4 times faster. >> >> Todd Zuercher >> P. Graham Dunn Inc. >> 630 Henry Street >> Dalton, Ohio 44618 >> Phone: (330)828-2105ext. 2031 >> >> -----Original Message----- >> From: Marius <mar...@mastercut.co.za> >> Sent: Friday, July 07, 2023 4:17 AM >> To: emc-users@lists.sourceforge.net >> Subject: Re: [Emc-users] [Emc-developers] Trajectory planner shortcomings >> >> [EXTERNAL EMAIL] Be sure links are safe. >> >>> On 2023/07/06 22:54, John Allwine wrote: >>> The latest software on the Pocket NC is using the same trajectory planner >>> as what is in LinuxCNC. >>> >>> I haven’t followed the whole thread. What seems to be wrong with the >>> trajectory planner when doing 4 or 5-axis? >> The trajectory planner only has one line look ahead for any rotary axis. >> So this means that trajectory planning is not really happening and >> performance is very poor when trying to achieve faster moves. >> >> >> >>>> On Jul 6, 2023, at 12:34 PM, Eric Keller <keller...@gmail.com> wrote: >>>> >>>> The Pocket NC runs Machinekit. I'm told machinekit has a better TP, >>>> but I haven't seen any evidence of that. >>>> >>>>> On Thu, Jul 6, 2023 at 12:27 PM Roland Jollivet >>>>> <roland.jolli...@gmail.com> wrote: >>>>> >>>>> The small 4-axis CNC machine,'Pocket Nc' uses LinuxCNC as far as I >>>>> can tell, and it seems to run just fine. Or does it? >>>>> >>>>> Roland >>>>> >>>>> >>>>> >>>>>> On Tue, 4 Jul 2023 at 20:16, andy pugh <bodge...@gmail.com> wrote: >>>>>> >>>>>>> On Tue, 4 Jul 2023 at 18:34, Marius <mar...@mastercut.co.za> wrote: >>>>>>> The problem seems to be that our trajectory planner lack the >>>>>>> ability to look ahead for any rotary axis. This means that a >>>>>>> coordinated move that includes a rotary move will be dysfunctional at >>>>>>> best. >>>>>> It's not as bad as that. >>>>>> >>>>>> There is a 9-axis blending planner in Tormach, but it's not trivial >>>>>> to merge it with Linuxcnc due to divergence in the codebase. >>>>>> >>>>>> If we could get hold of the patches that introduced it to Tormach >>>>>> then we could look at integrating it, but doing it just from >>>>>> comparing the code sounds hard. >>>>>> >>>>>> -- >>>>>> atp >>>>>> "A motorcycle is a bicycle with a pandemonium attachment and is >>>>>> designed for the especial use of mechanical geniuses, daredevils >>>>>> and lunatics." >>>>>> — George Fitch, Atlanta Constitution Newspaper, 1912 >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Emc-users mailing list >>>>>> Emc-users@lists.sourceforge.net >>>>>> https://l/ >>>>>> ists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7C >>>>>> toddz%40pgrahamdunn.com%7Cab74bf847dbf4526bf1508db7ec2a17c%7C575854 >>>>>> 4c573f47cebee96c3e0806fb43%7C0%7C0%7C638243146663401436%7CUnknown%7 >>>>>> CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLC >>>>>> JXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=TFj1jTETd5iX3h7J8%2B%2FNc3usPgZF >>>>>> o8N4E7lrAShUfhU%3D&reserved=0 >>>>>> >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> Emc-users@lists.sourceforge.net >>>>> https://li/ >>>>> sts.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Cto >>>>> ddz%40pgrahamdunn.com%7Cab74bf847dbf4526bf1508db7ec2a17c%7C5758544c5 >>>>> 73f47cebee96c3e0806fb43%7C0%7C0%7C638243146663401436%7CUnknown%7CTWF >>>>> pbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI >>>>> 6Mn0%3D%7C3000%7C%7C%7C&sdata=TFj1jTETd5iX3h7J8%2B%2FNc3usPgZFo8N4E7 >>>>> lrAShUfhU%3D&reserved=0 >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lis/ >>>> ts.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Ctodd >>>> z%40pgrahamdunn.com%7Cab74bf847dbf4526bf1508db7ec2a17c%7C5758544c573f >>>> 47cebee96c3e0806fb43%7C0%7C0%7C638243146663401436%7CUnknown%7CTWFpbGZ >>>> sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% >>>> 3D%7C3000%7C%7C%7C&sdata=TFj1jTETd5iX3h7J8%2B%2FNc3usPgZFo8N4E7lrAShU >>>> fhU%3D&reserved=0 >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://list/ >>> s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Ctoddz% >>> 40pgrahamdunn.com%7Cab74bf847dbf4526bf1508db7ec2a17c%7C5758544c573f47c >>> ebee96c3e0806fb43%7C0%7C0%7C638243146663401436%7CUnknown%7CTWFpbGZsb3d >>> 8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C >>> 3000%7C%7C%7C&sdata=TFj1jTETd5iX3h7J8%2B%2FNc3usPgZFo8N4E7lrAShUfhU%3D >>> &reserved=0 >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
