On Wednesday 15 April 2020 12:35:39 Jon Elson wrote: > On 04/15/2020 08:00 AM, Stuart Stevenson wrote: > > Hi, > > > > It sounds to me like you will run into a problem with G41/G42 when > > you get the roughing radius offset working like you want. > > When using G41/G42, if the tool radius (plus any diameter/radius > > modification for roughing) is not smaller than the programmed radius > > of the corner LinuxCNC will give you an error code and will not run. > > Maybe G41.1/G42.1 or G41.2/G42.2 will handle this but I have never > > used either so I don't know. > > You have to choose the right lead-in and lead-out points > knowing in advance that you will be making a cutter offset > greater than the actual tool diameter for the roughing > pass. I did this some years ago when I coded some tricky > shapes by hand, and after a few tries it worked well. I > think the better way to do this is to make the lead-in and > lead-out moves arcs, that solves the gouge problem. I have > not tried this. > > Jon > That brings up an interesting train of thought Jon, because it seems to me this "arc" could be auto-calculated if the end points are known, but its two different solutions dependent on the diameter of the tool mounted.
I will say this: I personally haven't actually succeeded in makeing tool.tbl values ever do what I need and have wound up many times, particularly in the tool diameter dept, actually doing that math in my gcode. TLO comp, if important, has always been a measure it dynamically proposition and adjust the tool with the resultant argument, or diddle the co-ord system in use if I want it right. My fault? Possibly, but the present system is for sure unwieldly enough to run me off. If I do such in _my_ gcode, I can at least be assured its the same everytime I run that code, and the code is very easy to follow. And by now, something like 15 years later, I am used to DIY. 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) 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-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
