There was quite a bit of work done at NIST with locating of and discovery of the pose of a casting using probing. Much of it became a part of the CMM system they wrote. The advantage of it was that they could throw a part up there anywhere on the table and the CMM would find the part, find the pose, and then measure the things it had been told to measure.
There was also thinking that information like that found by the CMM could be translated into the six values assigned to coordinate offsets g54-g59.3 and used to locate and rotate a milling program. I'm pretty certain that they did not get that far. They did get a rudimentary six axis interpreter at the start of the process and six axis motion system at the other but IMO there was a lot of work yet to be accomplished between. As far as moving or rotating a part program in Cartesian space, I see no need to go beyond simple coordinate system offsets. I know that this does not take account of scaling that part program but what else am I missing here? Rayh On Tue, 2008-05-20 at 07:18 -0500, Andre' Blanchard wrote: > At 06:16 PM 5/19/2008, you wrote: > >On Mon, May 19, 2008 at 05:41:25PM -0400, xtra209 wrote: > > > > > > Is there any work happening on G68? > > > >Can you find a link to a manual or similar source that describes > >definitively how G68 works? I found some examples, and people > >asking questions about it, but none of them seemed like the full > >story. > > > >Chris > > There is this Fanuc manual. > <http://www.compumachine.com/Support/Downloads/Fadal/GE%20Fanuc/0010__GE_FANUC_User_Manual.pdf>http://www.compumachine.com/Support/Downloads/Fadal/GE%20Fanuc/0010__GE_FANUC_User_Manual.pdf > It describes a 2 block 3D rotation which I think is interesting but have > never seen a machine that supported it. > > A manual for an older Mit M300V control. > It also describes other types of rotations such as pattern rotation done in > an M98 sub call and rotations done with the G10 code. And parameter > rotations which is the one used to align and entire program to a part > placed on the table, it is done outside the program as part of the setup of > the job. Unfortunately not a lot of info on that one but on the machines I > have used it on (wire EDMs) it rotates around the work offset zero point > and is just an angle you enter on the screen as either degrees or a j,k > vector. > <http://www.meau.com/functions/dms/getfile.asp?ID=010000000000000001000000460900000>http://www.meau.com/functions/dms/getfile.asp?ID=010000000000000001000000460900000 > > I have not used the other types much, mostly just used the 2D G68 rotations. > > More Mit books. > <http://www.meau.com/eprise/main/sites/public/DOWNLOADS/-search_results?DocType=010&ManualType=0055>http://www.meau.com/eprise/main/sites/public/DOWNLOADS/-search_results?DocType=010&ManualType=0055 > > __________ > Andre' B. Clear Lake, Wi. > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
