Pete, It's mechanical. There is a sort of V-shaped cam in the spindle that is engaged by a pin on the hydraulic cylinder that pushes the drawbar down. As the cylinder comes down, but before it contacts the drawbar, the pin rides in the cam causing the spindle to orient.
It took us forever to figure this out. I spent quite a while going over every inch of the head looking for some sort of orient sensor, and being baffled as to why the spindle drive didn't have an orient card even though all the Fanuc controller docs said it should have one. It wasn't 'till we took half the head apart that we figured it out. Much later I came across the patent that the machine builder got for the whole setup (including the drawbar): http://www.google.com/patents/US4075927 On Mon, Jun 15, 2015 at 9:24 AM, andy pugh <bodge...@gmail.com> wrote: > On 15 June 2015 at 15:07, Rick Lair <r...@superiorroll.com> wrote: > > I'm with Pete, Jealous as Hell, > > I wish you would both stop moaning and get on with your toolchangers. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
