pirmd., 2024. g. 9. dec., plkst. 12:29 — lietotājs Robert Schöftner (<r...@unfoo.net>) rakstīja: > > 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? >
I welcome any questions or suggestions or criticisms on that approach of laser tube mounting because I do not have experience with lasers. I tried to search the web for any existing examples of mounting laser tube on a moving stage of the machine and found only one case. The fact that basically nobody is doing it this way makes me think that there are reasons which I am unaware of. So I am open to any input - I see it as a potential to save me some headache later. Client had the idea to build it this way so now I am trying to implement it. The bonus of this arrangement is the short path of laser beam from tube to lens with only one mirror that does not move relative to laser tube. That is why I think that maintaining alignment should not be that hard (customer initially wanted to mount the tube vertically right above the head and lens but I talked him out of that). That box will be bolted to those aluminium supports. They might flex a little in Y direction which is parallel to laser beam so that should not affect anything (and if it does - that is easy to fix with a diagonal element). I am not sure about the laser tube inside the box. Encapsulating it in foam seemed the only way to fix it in place without introducing any additional stresses. IMHO mounting it with clamps and bolts will put a stress on it and it will crack. Those 4 pieces hold together only at the ends where the laser beam is turned around and then with 2 plates near ends (it can be seen in the picture with more close-up view) where it is put on few spots of epoxy or something similar (and I am convinced that it will not stick to the glass really strong) and then in that closer look picture there can be seen short pieces of small diameter glass tube in the gaps between those main elements - they also do not seem to be melted together really much so might break off easily. I asked chinese manufacturer for instructions how to lift and handle that thing - they only showed how to connect cooling water and power supply. My whole impression is that grabbing and slightly lfiting that thing by one corner will break it. That is why I do not even want to attempt taking it ouf of that box but rather try to come up with a way to fix in the place as it is. Taking off those side panels would be easy but I I still have no idea how to proceed from there. > > 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. > Besides my cnc machinetool activites I also work for technical university so I have access to published papers and articles. If you can provide me with authors or paper name or DOI number I am pretty sure I can get it. Viesturs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
