Il giorno mar, 14/02/2012 alle 12.02 -0600, Jon Elson ha scritto: > 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 Thanks for this explaination. in my case i'll have only line-line movements, since the way that i'm recording movements is point-by-point. so i don't have need of Q. speaking for absurd...what if (talking about mm units) i exagerate the P value to..let's say 1000 mm, in a 'spline' made of a thousand of 1mm lines? What the machine is expected to do? I'm saying that because i've tried and nothing changed..
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