On Saturday, July 30, 2011 11:21:40 AM Steve Blackmore did opine: > On Fri, 29 Jul 2011 15:31:49 -0500, you wrote: > >All, > > > >I have a dual boot computer configured with both Windows/Mach and > >Linux/EMC2.4.6. I ran Steve's code on both systems and the problem > >that he describes is evident when running the code on EMC, but not on > >Mach. > > > >To answer Jon's question: > >> Does it start out running well, but then the slowdown develops > >> later in the part program? > > > >No - The problem is apparent at the first G2 move. The machine appears > >to change feedrate between G2 and G1 moves. Moving from one G2 line > >to another G2 line is smooth, and moving from one G1 line to another > >G1 line is smooth. G1 moves appear to run at around 60% of the > >feedrate of the G2 moves, so the transition from G1 to G2 (or G2 to > >G1) makes the machine seem erratic. If I slow the feedrate down, the > >problem persists. > > > >My test machine is a stepper machine - the change in feedrate is even > >more noticeable because of the change in pitch at different motor > >speeds. I don't think that this is a processor power issue, as I can > >reproduce it even after deleting all but the first 6 lines of motion > >code (leaving the safety block). > > Hi Rogge > > Thanks for testing - Looks like you found it, it does appear to be some > trajectory planner bug on transition from lines to curves/curves to > lines. > > I tested the code on some mdf, I'm glad it was only a test and not an > expensive piece of wood, the cutter left burn marks on some of the > slowdowns :(
Sounds like I should be careful then, as I made a vice to hold a gun stock yesterday, and am about to do the grosser parts of carving the bedding channel for a BP action. These cuts will be 'out of sight' and generally straight line in maple & a cherry forearm cap, but still... > Steve Blackmore > -- > > ------------------------------------------------------------------------ > ------ Got Input? Slashdot Needs You. > Take our quick survey online. Come on, we don't ask for help often. > Plus, you'll get a chance to win $100 to spend on ThinkGeek. > http://p.sf.net/sfu/slashdot-survey > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) I am examining you on your fool ideas that no intelligent Christian on earth believes. -- Clarence Darrow, to William Jennings Bryan ------------------------------------------------------------------------------ Got Input? Slashdot Needs You. Take our quick survey online. Come on, we don't ask for help often. Plus, you'll get a chance to win $100 to spend on ThinkGeek. http://p.sf.net/sfu/slashdot-survey _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
