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 <[email protected]> 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. Download now >> http://ad.doubleclick.net/ddm/clk/292181274;119417398;o >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> 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 > [email protected] > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
