There is several ways including the Machine Menu http://linuxcnc.org/docs/2.7/html/gui/axis.html#_menu_items
and using MDI http://linuxcnc.org/docs/2.7/html/common/User_Concepts.html#_when_you_8217_re_lost Or you can just move to an unused coordinate system when you touch off Z to a fixture. JT On 6/25/2015 8:04 AM, Tom Easterday wrote: > How do cancel any G54 offsets? Also, I understand that X is based on the > center of the spindle but you still need to know when you touch (or cut) the > workpiece the relative difference between the tool that did the cut and all > the others. Some how you have to get the X offsets from a master tool in the > table too… > > -Tom > >> On Jun 25, 2015, at 6:55 AM, John Thornton <j...@gnipsel.com> wrote: >> >> It looks like the tool table touch off has been split from the >> coordinate system touch off with the added button in 2.7. One thing to >> remember is to not have any G54 offsets in effect when your touching off >> tool to the tool table as they will get added to your tool touch off and >> that is a bad thing. >> >> On a lathe the X offset will not change with material changes it will >> always be related to the center of the spindle. That is why you don't >> treat the X the same way as the Z. >> >> JT >> >> On 6/24/2015 11:06 PM, Tom Easterday wrote: >>> For tool and work offsets on my mill I follow the advice given here: >>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?MillSetup >>> <http://wiki.linuxcnc.org/cgi-bin/wiki.pl?MillSetup> which in a nutshell >>> says: you set one tool (an edge finder perhaps) at a specific point and >>> then reference all tools (in length, ie. Z) to that reference tool. So >>> settings in my mill tool table have Z values that are +/- the difference in >>> length between the reference tool and the given tool. >>> >>> I am trying to set up the tool table for a lathe and am having problems. I >>> see that the advice for doing this differs from what I am doing above on my >>> mill. So, I was trying to follow the advice in section 21.4 of the >>> Linuxcnc User Manual: >>> http://www.linuxcnc.org/docs/2.7/pdf/LinuxCNC_User_Manual.pdf >>> <http://www.linuxcnc.org/docs/2.7/pdf/LinuxCNC_User_Manual.pdf> >>> >>> I have the Z offsets in the tool table and that part seems to be working. >>> However, I am having problems getting the X offsets to work (even though i >>> think i am doing exactly the same thing as Z). I set the X offset by >>> doing this: >>> >>> In MDI issue: T1 M6 G43 >>> Turned down some stock to 0.55” >>> Select “Touch off to fixture” in Machine menu >>> Make sure X is the selected radio button >>> Select “Touch off Tool” button (This button is new in Axis in 2.7 I think?) >>> (Bug? in 2.7.0~pre6 - the dialog for this button refers to Workpiece not >>> Fixture) >>> Enter 0.275 (yes, I entered a positive number even though my tool is above >>> the spindle centerline - is that correct?) >>> >>> In the tool table I get an X value that basically looks like a distance >>> from G53 X0 (something like 1.XXXX). >>> >>> Then to enter a second tool: >>> In MDI issue: T8 M6 G43 (This is a 0.25” drill) >>> Bring it down to touch the top of a 0.100” pin which is on top of my 0.55” >>> workpiece >>> Select “Touch off to fixture” in Machine menu >>> Make sure X is the selected radio button >>> Select “Touch off Tool” button >>> Enter 0.275 + 0.100 + 0.125 = 0.5 (yes, I entered a positive number even >>> though my tool is above the spindle centerline - is that correct?) >>> >>> In the tool table, again, I get an X value that basically looks like a >>> distance from G53 X0. >>> >>> When I go back to tool T1 (T1 M6 G43) and then issue a G0 X0 the tool goes >>> to the center of the spindle as it should. >>> >>> But, if I return to tool T8 (T8 M6 G43) and issue a G0 X0 the drill does >>> not go to the center of the spindle. And it’s distance away is not any of >>> the measurements above, in other words I can’t figure out where I went >>> wrong. >>> >>> Perhaps I should just be following the procedure I used on the mill and >>> just forget about “Touch off to fixture” and “Touch off Tool” and enter >>> values +/- of the reference tool? >>> >>> I am quite confused at this point. I have looked at JT’s tutorials, and >>> all the Linuxcnc manuals and other random documents that talk about this, >>> but every time I think I understand and try the procedure I get the wrong >>> result. By the way, I have entered the ORIENTATION and the FRONT and BACK >>> ANGLES in the tool table for these tools, could those things (if I happened >>> to enter them incorrectly) effect the X offset? >>> >>> -Tom >>> >>> >>> ------------------------------------------------------------------------------ >>> Monitor 25 network devices or servers for free with OpManager! >>> OpManager is web-based network management software that monitors >>> network devices and physical & virtual servers, alerts via email & sms >>> for fault. Monitor 25 devices for free with no restriction. 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Download now >> http://ad.doubleclick.net/ddm/clk/292181274;119417398;o >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Monitor 25 network devices or servers for free with OpManager! > OpManager is web-based network management software that monitors > network devices and physical & virtual servers, alerts via email & sms > for fault. Monitor 25 devices for free with no restriction. Download now > http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Monitor 25 network devices or servers for free with OpManager! OpManager is web-based network management software that monitors network devices and physical & virtual servers, alerts via email & sms for fault. Monitor 25 devices for free with no restriction. Download now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
