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
