a useful thing is a specialized editor for gcode that can operate on selected sections of code. one of the editor's operations is to take a gcode selection, and within a tolerance from the original code, produce a more compact chunk of code. the millions of lines of 3d g1 moves are turned into about an order of magnitude shorter chunk consisting of linear and helical interpolations in all three planes. other handy editing features are scaling, rotating, and creating arrays from selected chunks of gcode into new gcode chunks. ..offsetting tool paths, sweeping a selected path along another (think of moulding trim, or extrusions)..
--- On Thu, 4/19/12, Viesturs Lācis <viesturs.la...@gmail.com> wrote: > From: Viesturs Lācis <viesturs.la...@gmail.com> > Subject: Re: [Emc-users] Trajectory planning and other topics from a > EMC(LinuxCNC) newbie (TheNewbie) > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Date: Thursday, April 19, 2012, 11:53 PM > 2012/4/20 Scott Hasse <scott.ha...@gmail.com>: > > It seems to me that the likelihood of fixing all of the > methods of gcode > > generation such that they don't generate short line > segments is > > approximately zero. Also, it seems that even if a > proprietary LinuxCNC > > gcode extension allowed arbitrary plane arcs, splines, > etc. that the > > likelihood of CAM packages being able to make proper > use of that is also > > approximately zero. > > Unfortunately it seems to be true :( > > I was thinking about Kenneth's idea: > > 2012/4/19 Kenneth Lerman <kenneth.ler...@se-ltd.com>: > > > > Is anyone here interested in writing a filter that > takes as input a > > tolerance (error band) and a sequence of motions (arcs > and line > > segments) and generates a new sequence of motions that > duplicates the > > original within the error band? It sounds like that > would be one way to > > address the problem. > > Is there a way to create a filter that would convert those > small, tiny > G1s into a 3D Nurbs lines? > I do not know, how many people have seen this: > http://158.110.28.100/amst08/papers/art837759.pdf > This paper shows the difference of the machining velocity, > which > substantially increases as "better" code is presented to the > cnc > controller. > It seems that the version in the paper is 2D Nurbs, but > Yishin says > that they have 3D Nurbs in Araisrobo branch. > The only thing I do not get, is how to do the reverse math - > describe > a line, if (a lot of) points on it are provided. It does not > seem to > be problem finding formulas on the web to calculate a > coordinates of a > point on a described line. But reversing that seems > difficult. > > 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 > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
