I have one in the works but life had other plans, and it's collecting dust and other stuff at the present time. Actually a bridge mill rather than a gantry with the moving bridge (W axis) being parallel to the Z axis. The reason is simple. To be able to have Z retracted for rigidity but still have about 16 to 18 inches Z clearance. possibly enough Z travel to reach the table with W at full hight. My plan is to electronically slave one to the other such that one is consantly keeping in sync with the other. An upcounter/downcounter kind of setup. emc will only handle one, the other just follows along. The slave's FE will be monitered outside of emc. That was the plan before emc2 was even a thought, and I'll be sticking to it.
What you consider the tricky part is second nature to me. Building machine parts to tight tolerances and then assembling them to even tight er tolerances was half of my life. I wasn't trying to make a metal working machine so there will be enough strength and flex built-in to handle crashes, and tolerate minor missalinments of any reasonable FE. Anything beyond that will be a fault condition. Should I live long enough to finish building the mechanical end of it, I may never need some of the electronics I've designed for it. And if it ends up to be Rigid enough to mill aluminum then great! It was and still is meant for woodworking. Work envelope of @ 36" x 24" x 18", the 36" X axis could be open on both ends? Jon Elson wrote: > Has anyone set up tandem axes in EMC2? Getting two servo axes > to run in parallel isn't too hard to do in hal, although what > you do with two following errors is something to consider. > > But, the tricky part is getting them homed into proper alignment. > > (If you don't know the term, a tandem axis is one with two > parallel linear drives, such as on the two ends of a gantry. > These are capable of completely independent motion, and only the > CNC control keeps them parallel.) > > Jon > > ------------------------------------------------------------------------- > 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 > ------------------------------------------------------------------------- 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
