Am Freitag, dem 06.12.2024 um 23:43 +0200 schrieb Viesturs Lācis: > 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. >
It's really none of my business but that laser-tube "installation" really looks scary. Are you going to run those tubes in that enclosure? How do you maintain alignment with this kind of non-rigidity? > 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. You probably found my hack I did some years ago with replacing trapezoidal acceleration profile with something "smooth" bezier-based. Unfortunately there are some corner-cases where accel-spikes happen and/or the thing just stops and even then it would not be a complete solution as it only looks at "tangential" movement and won't help a bit with line->line transitions (that have infinite acceleration, current TP should replace that already with circular arcs where possible) or line->circle transitions (that have infinite jerk). Some swiss school made a linuxcnc fork that has a jerk limited TP, but it's not easy to integrate that with stock linuxcnc, the code structure is dissolved in acid, digested, and then reconstituted in a new directory structure/build system/everything. And the TP mainly consists of some MATLAB-generated C-Code If you want to look yourself, I recently found prunt3d.com which uses "pythagorean hodographs" to round corners and generate jerk-limited trajectories. But it is written in (of all languages) ada!, and the preprint i found of the paper it is based on is somewhat hard to read. The published paper is locked behind a paywall. regards Robert _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
