Chris R had done some work a while back to try to use full acceleration - but after testing it he reverted them. I don't remember what the issues where at the time.
these 2 commits where added then reverted. http://git.linuxcnc.org/gitweb?p=linuxcnc.git;a=commit;h=fbcbec10e636e6332c9fdc86b882ccaf9d94b6d1 and http://git.linuxcnc.org/gitweb?p=linuxcnc.git;a=commit;h=436aa886a1890767ce8a5cef9908c911749a363e reverted here. http://git.linuxcnc.org/gitweb?p=linuxcnc.git;a=commit;h=32ad57085796328876934ac22542bc86db76761f and http://git.linuxcnc.org/gitweb?p=linuxcnc.git;a=commit;h=775ff98954d7d340bdb793f090729947bc15a393 The comment says This reverts commit 436aa886a1890767ce8a5cef9908c911749a363e which was half-baked, improperly handling aborting/pausing/FO (I love that comment - tell it like it is :) ) but this might be a starting point to improve velocity? Until more read ahead added? sam On 09/14/2013 10:57 AM, sam sokolik wrote: > One thing to remember is the current linuxcnc trajectory planner seems > to be rock solid. I don't remember someone having some odd motion that > could not be explained. A lot of work/testing went into this. > > sam > On 09/13/2013 09:41 PM, Chris Morley wrote: >>> Date: Fri, 13 Sep 2013 14:54:04 -0500 >>> From: [email protected] >>> To: [email protected] >>> Subject: [Emc-developers] Some trajectory testing between mach and linuxcnc >>> >>> I finally did it.. >>> I installed mach3 on an xp machine and setup a machine. >>> I setup linuxcnc and mach with all 3 axis set to 500ipm and 30 in/sec/sec. >>> >>> Well there you go.. It seems to be with strait G64 - linuxcnc 1 segment >>> lookahead seems to be the limiting factor. There is some situations >>> that the G64 Px.xxx will improve the path speed. (longer line segment >>> means higher peak velocities.) This also suprised me - both mach and >>> linuxcnc must be using very similar trajectory planning maths. >>> >>> High speed machining/routing/whatever with short line/arc segments is >>> only possible at the moment with linuxcnc on high acceleration >>> machines. (I had to set the acceleration to over 450in/sec/sec to get >>> the velocitys up to 400ipm) >>> >>> In my opinion - this should be a priority. (and I know it is probably >>> going to be a lot of work) (and about all I can do is test) >>> >>> Discuss... (of course I could be missing something obvious) (A work >>> around perhaps?) >>> >>> sam >> Hey Sam thanks for doing this and posting it to the maillist for everyone. >> Finally a no assumptions comparison! >> While I had no doubt the Mach guys weren't making it up, now we can >> say yes you do have a faster feed on certain short segment Gcodes. >> >> I personally agree that this should be a higher priority feature. >> And like you I don't know what this entails to actually do. >> >> I wonder if some one with linuxcnc trajectory experience could spell >> out how this part of the trajectory planner works and what problems >> /amount of work etc there would be to add look ahead. >> >> I think the fact that the trajectory planer is uncharted 'black magic' >> that holds back it's further development. With some help maybe I could >> start a current description in the wiki .... >> >> Chris M >> >> ------------------------------------------------------------------------------ >> How ServiceNow helps IT people transform IT departments: >> 1. Consolidate legacy IT systems to a single system of record for IT >> 2. Standardize and globalize service processes across IT >> 3. Implement zero-touch automation to replace manual, redundant tasks >> http://pubads.g.doubleclick.net/gampad/clk?id=51271111&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-developers mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-developers >> > > ------------------------------------------------------------------------------ > LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! > 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint > 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes > Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/22/13. > http://pubads.g.doubleclick.net/gampad/clk?id=64545871&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/22/13. http://pubads.g.doubleclick.net/gampad/clk?id=64545871&iu=/4140/ostg.clktrk _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
