On Thu, Aug 12, 2010 at 06:53:52PM +0100, Schooner wrote: > Hi > > Downloaded and compiled the above to 'run-in-place' , just to see what > had changed etc. > Have previously been using v2.3.0 from the cd image. > > Thus far functioning as expected with one exception. > > When I ran a test threading file, I got an error for setting 'I0' ie > thread peak = 0 > > This works fine under 2.3 and seems the only sane setting if you have > turned down to finished diameter before threading. > > Since a dialog pops up that specifically says I cannot be zero, the > logic has obviously changed from 2.3, but the documentation has not.
I see in the release notes that this change happened in the 2.3.3 release http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?OldReleases and the change was in response to bug #2817324 http://sourceforge.net/tracker/?func=detail&aid=2817324&group_id=6744&atid=106744 > I changed I to -0.001(mm) which made damn all practical difference and > the code was accepted and works. > The DROs showed the 0.001 has been subtracted from the X diameter in all > passes. > > Perhaps the documentation needs to specify that 'I' must be a signed > value and if the driveline is already at the thread peak, it should be > adjusted by +/- I to compensate. http://www.linuxcnc.org/docs/html/gcode_main.html#sec:G76:-Threading-Canned In the G76 documentation it says Negative I values are external threads, and positive I values are internal threads. It's true it doesn't specifically say that zero is disallowed, but considering the picture there, it seems like with I=0 the tool would drag along the thread on the return passes. What am I missing? Would it be enough to say above in the "It is an error if:" section "I is zero"? Thanks Chris ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
