At 11:48 PM 7/17/2007, you wrote: >Chris Radek wrote: > > Hi all, > > > > I thought I should mention that I merged my nine-axis changes into > > the cvs trunk. We now have fully coordinated motion in six linear > > axes (UVWXYZ) and three rotary (ABC). > > >Cool! DAMN cool! > >One of the quirks in the old days was how to program the rate of >these mixed-axes moves. For instance, in an XYA move, it is >easy to compute the feedrate of the XY part, but without knowing >the radius the cutter is at from the center of the A axis, you >can't add that component to the total velocity. How is this >handled now?
The X,Y U,V wire EDM's I run have a set of what they call Z constants. Z1 is the distance from the machine table to the point at which the X,Y size is held true. Z2 is the distance from the table to the point at which the feed rate is held true. Z3 is the distance from the table to the upper wire guide. Z4 is the distance from the table down to the lower guide. Using this info the control can calculate the displacement of the U,V slides from the X,Y to get the taper angle and the part size programmed in the G code. > > Also, thanks to some work Jeff did, you can have any set of these > > defined - whatever is appropriate for your machine. >Again, definitely cool! > > This ought to help with some simple things like knee vs quill on > > mills (XYZW or XYZAW), as well as maybe being useful for some more > > specialized setups like foam cutters (XYUV). > > >Yes, we definitely had a restriction for foam cutters and wire >EDM, both of which use a pair of parallel X-Y axes. > >Jon __________ Andre' B. Clear Lake, Wi. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
