Hello! One of the Biesse retrofits I have been working on lately is finally receiving some of its intended final shape: https://photos.app.goo.gl/cKi8pysM3Tnb9Egh6
That wood box on top of it contains 600W laser CO2 tube (some pics of it also included). Since I have no idea how to lift it without braking I decided to mount it with all the box and encapsulate the tube in foam. But still I believe that crucial for this project is jerk-limited motion to avoid the bumps at start and end of motion not only to keep the components in place but I also think (have no experience with laser tubes and did not find too much info on the web) that laser tube itself might not like it (I have to put PSUs and chillers up there as well - chillers might appreciate it as well). Customer already knows that the accelerations will be way lower than previously when this machine still had all the spindles but I am still worried about the jerk. So the question for 10K is: what is the current status of jerk limitation? Searching mailing list and forum shows quite a few discussions but I did not see anything about it being implemented (in separate branch or whatever). I do recall discussion that it would be hard to make it work with spindle synchronized moves. I do not need that here, motion only with G0, G1 and G2/G3. Is there any alternative trajectory planner to try? I found this script (unfortunately python is the code that I totally do not understand so I have no idea what does this script do): https://github.com/cnc-club/linuxcnc/blob/master/devshit/s-curve.py AFAIK cnc-club is a group of LinuxCNC users in russia that have done some development (including translations etc) but I do not recall that they would merge their stuff back. I am fine with workarounds as well. I did find discussion from 3 years ago here on mailing list with a suggestion of putting limit3 component before pid component. That machine has 8i20 servo drives, if that changes anything. pid.n. command is connected to joint.n.motor-pos-cmd at the moment. Oh and once I mentioned 8i20 drives in that Biesse - PCW I still would like to get an answer about the implementation of those Yaskawa encoders with bizarre C channel. If that is too much effort then it is fine, "NO" is also totally valid (and pretty expensive for me) answer so I would hope for something positive, but getting any answer at all would be better. AFAIK there are some convertors that cost quite a few hundreds per piece and can do the trick but I have lots of questions and doubts about them (but I could try to get one and send over to you if that seals the deal). Viesturs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
