On 03/20/2015 11:47 AM, Marius Liebenberg wrote: > A question for the the avid machinists among us (not me that much). > I have my mill setup to have the x axis travel along the table (long > axis) and the Y axis is the short travel. My homing sequence brings the > table all the way left and forward to put the tool at the right hand > back corner. > > Kirk's answer is very good, but I'd like to go a little further. Really, the position called "home" doesn't matter much at all. All soft limits are measured from that position, but you never use the machine coordinates unless you are setting up an automatic tool changer.
First, you need your axes to more in the correct direction. On a typical mill, the table moves to the left for +X coordinates, as they are referred to the workpiece. Moving the table to the left "moves" the tool to the right, which is the +X direction relative to the work. In the same way, moving the table toward you in Y moves the tool to the +Y on the work. By convention, moving the tool up in Z is +Z. These coordinate system conventions are built into CAD/CAM software, so you want to follow them. If you have good home switches (or even better, home to index with encoders) you can repeatably restore the position of the machine in different sessions, so touch-off settings to a workpiece, vise or fixture can be brought back automatically. The touch-off feature sets an offset between machine coordinates and workpiece coordinates, bringing the workpiece into the coordinate system it was designed in in the CAD system. Jon ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
