Hello, I have a 3-axis cnc router for making small items (printed circuit boards etc.). Because it uses a high speed motor (30 000 rpm), it uses collets to hold drills or milling tools. When drilling PCBs I must change drill size quite often, so I have tried to use G28to move to a known, absolute position, away from the workpiece, before doing a drill change. This works, except that I want to move Z first (to clear clamps etc.), and then move to the absolute position. I do not want to issue commands using the workpiece 'Zero' reference, but the absolute 'machine' one.
According to the manual: "To return one or more axes to the predefined position by way of the programmed position, program G28 'axes' (or use G30). The path is made by a traverse move from the current position to the programmed position, followed by a traverse move of the named axes to the predefined position." Using "G28 Z-10", I expected a vertical move to machine -10, followed by a traverse to the G28 position (In my case X10,Y10,Z-10), but instead, only the Z-10 is performed. If I omit the Z axis part, the tool moves (diagonally) to the correct position. Is my understanding here wrong? Can anyone suggest a solution? Regards, Robert von Knobloch ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
