On Friday, February 25, 2022 9:05:45 AM EST Thaddeus Waldner wrote: > >> You don't need a joint at all. You can just have an encoder > >> channel that doesn't connect to any joint. > > I will look into the halsampler solution. Can you point me to a working > example? The end goal is indeed a point cloud. One issue that might > make it simpler (or not!) to have an actual joint is that I have still > not determined if the probe/wheel can work on a linear axis or if I > need to do a trailing rotating arm so as better to roll over steep > features without snagging.
That should not be required since G38.2 can have a starting point well off the work for each point probed. That initial slow motion will eat execution time like M&M's though. One could run an initial low res probe, and the results of that then used as the starting point for the hi res and slower probe, starting at say 50 thou out from the low res probe result. Some creative writing will pay off in quicker results. To stop probe crashes, use a start point for each probe that is the highest of the 3 adjacent to the current point the hi res probe is doing, > > True, though there is something to be said for having a dummy axis > > just so that the LinuxCNC GUI will display the encoder position. > > > > You don't need a stepgen, just set up the system as normal but leave > > joint.N.motor-pos-cmd unconnected. Connect motor-pos-fb to the > > encoder > > counter. > > Then set the following error limits to several miles, and you should > > get an onscreen readout of the probe position. (set the gui to > > actual, > > not commanded..) > > This works with some caveats. The back plot updates to show movement of > z position until I enable the joints. At which point it stops updating > the back plot. The position readout does keep updating so maybe it > will work. > > I am not sure what the built-in parameters such as #<_Z> show in this > > situation. I would suspect that it is commanded position but it's not > > hard to find out. > > That would be the next step.. > > Thanks for the help, gentlemen. Take care & stay well Thaddeus. Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
