Andy, The C axis label is usually assigned to the rotary axis that rotates parallel to the Z axis motion of the machine. If you are tilting the head of a knee mill (ie BridgePort style) you would be rotating the A or B axis. You would then be able to jog the theoretical A and/or B axes to match the head orientation and machine features orthogonal to the tool axis using U and V.
I believe you would need to use tool lengths and a pivot point to have the display show tool positions relative to other features machined while the A and B axes were orthogonal to the XY plane. A G54 offset may be able to match the display numbers. On a Fanuc 15mb a G68 command allowed rotating the XY plane to any angle. A second G68 line would rotate the XY plane to a second angle. The trick is which to rotate with the first line to end up with the angled plane you desired. Then XY commands would machine features orthogonal to the described plane. Drill cycles also worked orthogonal to the described plane. regards Stuart On Sun, Jun 7, 2020 at 11:15 AM andy pugh <[email protected]> wrote: > My milling machine has a (manual) swivelling head but no quill. > > I have long fancied the idea of setting up a pseudo-quill. > > My idea is to add C and W axes, where C has to be jogged to suit the actual > angle head is set to, and then moves in W will be coordinated moves in X > and Z. > > Has anyone used a machine with a B axis and has practical tips about what > it is like in practice? > > I imagine that tool lengths need to be set up to be from the pivot point, > and that to get the correct behavior the W G-code or jogged value would be > added to the tool length? > > I don't think I am ready to think about the existing A axis in this scheme > yet. > > -- > 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-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
