On Mar 5, 2009, at 8:44 AM, Kirk Wallace wrote: > On Thu, 2009-03-05 at 16:54 +0100, Robert von Knobloch wrote: >> 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. > > I don't know if this helps, but at the bottom of: > > http://www.linuxcnc.org/docview/html//config_ini_config.html#r2 > > there is a toolchange .ini file parameter, [EMCIO] > TOOL_CHANGE_POSITION, > that may be useful. I seem to recall there is a form that allows > separating axis movement (ie. Z then XY). I haven't found any detailed > information. > ------------- > Kirk > http://www.wallacecompany.com/machine_shop/
Hi, IIRC TOOL_CHANGE_POSITION makes a coordinated move to the tool change position which can be rather disconcerting or even dangerous depending on Z height when it is called. For a manual tool change.... with the tool change position declared in the .ini I tend to do: G53G0Z0M5 (MSG, LOAD XX TOOL) M6M0Tn G5x (just to make certain I'm in the right reference frame) G43Hn ..... HTH Dave ....... > > > > ---------------------------------------------------------------------- > -------- > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
