As a follow to Andy's comment, I've been on 5 axis mills for 17 years and honestly have never once used 3d cutter comp. It has a place, but it's a very small place. Only one customer has ever asked about it.
Phil T. The Feral Engineer Check out my LinuxCNC tutorials, machine builds and other antics at www.youtube.com/c/theferalengineer On Thu, Apr 15, 2021, 7:03 AM andy pugh <[email protected]> wrote: > On Thu, 15 Apr 2021 at 05:49, Stuart Stevenson <[email protected]> wrote: > > > My current attention to the project is driven by my desire to have 5 > axis > > cutter diameter compensation in LinuxCNC. > > I think that there is an argument that this is better done in the CAM > as it has a much better idea where the material is, and can handle > non-cylindrical cutters. > Not that I am against the idea of it being doable in the controller, I > just think that it won't see much use. > > > Circular interpolation is also an area to be simplified. G17, G18 and > G19 > > can be eliminated. They would have to stay so legacy programs would still > > function. I would implement G02/G03 as follows: > > G02/G03 X Y Z I J K F would circle the tool around a vector perpendicular > > to a plane described by the IJ values combined with the XY start point > > It might be simpler to just define the centre point with IJK and > eliminate the explicit plane entirely. I think that start, centre and > end defines a circular arc in 3D space completely?) > > The interpreter could learn to use the new-style arc whenever it sees > all three of IJK. Or, alternatively, we could use the currently unused > G16 code to mean "arbitrary planes" > (G16 means "Polar coordinates" in Fanuc, but LinuxCNC uses @ and ^ for > that. If clashing with Fanuc is a problem then G19.9 could be used.) > I think that I prefer an INI entry in [TRAJ] that turns accepting all > of IJK in an M2 / M3 on and off. > > Note that there is already an old branch that attempted arbittrary arcs > https://github.com/LinuxCNC/linuxcnc/tree/arbitrary-arc > You can see the chages here: > > https://github.com/LinuxCNC/linuxcnc/commit/0fc41d50c1bce2bdecc8a90e6e5057af5153d66f > This used a "magic comment" to define the curve, but it can be seen > that it is pretty much the same input data as suggested above. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
