On Tuesday 21 July 2020 13:09:16 andy pugh wrote: > On Tue, 21 Jul 2020 at 18:03, Robert Ellenberg <[email protected]> wrote: > > 1. The rigid tapping cycle allows a hard-coded 10 revolutions > > > > <https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/tp/tc.c#L8 > >56> of overtravel beyond the nominal bottom of the hole when > > reversing direction. > > That feels like there should be an error message. > > "Maximum rigid tapping limit exceeded. And furthermore I have just > broken your tap"
"Maximum rigid tapping limit exceeded. And furthermore I have just broken your $85 carbide tap" There, I fixed it for you. :( 10 turns is way too far. I cut air at least once to measure the turnaround (I have that stuff in my .hal file) and in what I have done, that has led me to set a personal limit of 2 turns. Taking a broken tap out of a valuable blind hole via EDM is a genuine PITA and I will do whatever it takes to avoid that. But, I would not uncouple the spindle from the tap either, killing the spindle drive ASAP instead, then one might be able to back the tap out of the hole with the spindle, salvaging the part so maybe the hole could be finished by hand. 10 turns, breaking the tap is the wrong thing to do. Shutting down, leaving it coupled before the tap breaks is the best thing to do. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
