Spiderdab wrote: >> >> It is G64.1 Pxxx. G64 turns on some smoothing, G64.1 turns on more (and I'm >> vastly oversimplifying it.) Well, maybe they have changed it, but I'm >> pretty sure >> I used G64.1 Pxxx, but looking at section 3.1.3 it doesn't say that. >> http://www.linuxcnc.org/docs/EMC2_User_Manual.pdf >> >> Jon >> > I've never read about G64.1 , but I believe you and going to try that in > these days. What i've read also on that pdf is that with a P0 i have the > best velocity following, but also that it is the normal way LinuxCNC > works, even if you omit G64. Is it? > and, I really cannot understand what Q does (naive) and if you have to > use Q together with P or without. > > According to the documents, it is now G64 with a non-zero P value, that replaces the G64.1 Pxx that I used before. G64 P0 does NOT give the best velocity, it requires the tool to follow the path EXACTLY. So, at right angle corners, it will slow to zero speed. If you give G64 P0.001, then it will allow up to .001 (user units) of deviation from the specified path. The machine will slow down so that it passes within .001 of the specified corner. Depending on the machine acceleration settings, this could be significantly faster. If it is less acute than a 90 degree corner, it will be able to maintain much higher speed and still get within the P value of the exact corner. Yes, you have to try this out on some sample programs to appreciate the effect. It can easily halve the run time of a program. I have a worst-case torture test for this that is a 2" diameter circle done in 10,000 G1 moves. It takes several minutes to run in G61, and 13 seconds to run in G64 P0.001
If you add the Q word (apparently the value has no meaning other than a non-zero value turns on the cam detector). This apparently is only to handle the line-arc-line case (and maybe the arc-line-arc case also). The plain G64 Pxx only works on line-line intersections. Jon ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
