On 7/30/11, Steve Blackmore <st...@pilotltd.net> wrote: > On Sat, 30 Jul 2011 13:30:25 -0500, you wrote: > >>I remember that the developers at one point changed the way g64px.xxx >> worked so that it actually converted arcs to short line segments so the >> combining of line segments worked for the arcs also. >> >>but that is just a vauge recolection. > > An odd solution, maybe that now explains the following > > "G64 P- Q- it turns on the "naive cam detector"; when there are a series > of linear XYZ feed moves at the same feed rate that are less than Q- > away from being collinear, they are collapsed into a single linear move. > On G2/3 moves in the G17 (XY) plane when the maximum deviation of an arc > from a straight line is less than the G64 P- tolerance the arc is broken > into two lines (from start of arc to midpoint, and from midpoint to > end). those lines are then subject to the naive cam algorithm for > lines." > > However, It still doesn't explain why the huge slowdowns on just G64 > moves! > > "G64 without P means to keep the best speed possible, no matter how far > away from the programmed point you end up." > > Just ran it again in Mach and EMC, in Mach commanded feed was 3600 > mm/min, it never dropped below 3500. > > In EMC it only reached 3500 or over on ten short occasions or so > throughout the whole file. The rest of the time it was accelerating and > decelerating wildly and never getting to anything like maximum velocity, > despite both having same motor tuning parameters and pulse widths etc. > > Clearly - it's not doing what the manual says it does in G64 mode. > > Something for the developers to look at. > > 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 >
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