aye, lad. read on a couple more lines.
--- On Fri, 4/20/12, Stuart Stevenson <[email protected]> wrote: > From: Stuart Stevenson <[email protected]> > Subject: Re: [Emc-users] Trajectory planning and other topics from a > EMC(LinuxCNC) newbie (TheNewbie) > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Date: Friday, April 20, 2012, 6:05 AM > Doesn't even G02/G03 result in a > series of very small linear moves sent to > the servo motors? Wouldn't a NURB conversion do the same > thing? > On Apr 20, 2012 8:00 AM, "charles green" <[email protected]> > wrote: > > > another operation of the specialized gcode text > editor: convert the > > selected chunk of gcode/nurbs to a chunk of > nurbs/gcode. > > > > i dont have a good idea of what a nurbs nc file might > be like, but > > whatever it is, it still has to result in more or less > programmed machine > > tool positions. the advantage in such case seems > to be more in ease of > > user manipulating the control code. at the > machine level, the actuators > > are going to move stepwise unless the whole spiel is > somehow analog. > > > > so the question then is how to parse enormous sequences > of linear steps > > into code friendly sections. g1 is straitforward > enough, but too slow > > because the physical impementation involves > inertia. g2/3 improves by > > implying the g1 to g1 transitions within itself. > > > > would there be any advantage to making each physical > machine axis into a > > couple of circular movements, one going along R from 0 > to 360 degrees while > > the other rotates around 2R to make the motion > linear? ..a rotary > > differential movement instead of a linear movement. > ..the arbitrary > > interpolation schemes seem to be limited by the > compliance character of the > > machine movement. maybe the solution is a more > fluid machine movement > > somewhere beyond three orthogonal screws? > > > > > > --- On Fri, 4/20/12, Viesturs Lācis <[email protected]> > wrote: > > > > > From: Viesturs Lācis <[email protected]> > > > Subject: Re: [Emc-users] Trajectory planning and > other topics from a > > EMC(LinuxCNC) newbie (TheNewbie) > > > To: "Enhanced Machine Controller (EMC)" <[email protected] > > > > > > Date: Friday, April 20, 2012, 4:40 AM > > > 2012/4/20 Michael Haberler <[email protected]>: > > > > > > > > to stay within that model, for instance the > > > polyline-to-NURBS conversion would require yet > another > > > ad-hoce path 'queue'. The other option is to go > the > > > preprocessor route as Ken proposed. > > > > > > > > some problems cannot be addressed with a > deeper > > > interpretation-time path model like blending, > which must be > > > done at runtime due to external inputs like feed > override > > > which can impact on the actual path. > > > > > > > > > > It seems like I did not express it in a proper > way: > > > My idea was to adjust Ken's suggestion with Nurbs. > Basically > > > it would > > > be a filter, which would take g-code file with all > the tiny > > > G1 moves > > > and return the same path, expressed with Nurbs. > > > User then can save the output and reuse later. > > > > > > Michael, all the things You listed to be changed > makes me > > > think that > > > filter is much easier to do (except the math > part). > > > > > > 2012/4/20 charles green <[email protected]>: > > > > wikipedia puts a somewhat different spin on > nurbs. > > > see the "use" section of the article, first > paragraph. > > > > > > > > > > Yes, I looked also at the "Construction of the > basis > > > functions" > > > section and did not get much out of it. Well, I > did get > > > nothing out of > > > it :)) > > > > > > Viesturs > > > > > > > > > ------------------------------------------------------------------------------ > > > For Developers, A Lot Can Happen In A Second. > > > Boundary is the first to Know...and Tell You. > > > Monitor Your Applications in Ultra-Fine > Resolution. Try it > > > FREE! > > > http://p.sf.net/sfu/Boundary-d2dvs2 > > > _______________________________________________ > > > Emc-users mailing list > > > [email protected] > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > ------------------------------------------------------------------------------ > > For Developers, A Lot Can Happen In A Second. > > Boundary is the first to Know...and Tell You. > > Monitor Your Applications in Ultra-Fine Resolution. Try > it FREE! > > http://p.sf.net/sfu/Boundary-d2dvs2 > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it > FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. 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