On Friday 01 June 2018 14:46:52 jeremy youngs wrote: > On Fri, Jun 1, 2018, 13:20 Gene Heskett <[email protected]> wrote: > > Greetings everybody; > > > > I have the grub screw bore & tap working except for on glareing > > problem. I am using g38.2 to measure both the length of the drill, > > and the tap, and I had set the depth of the tap so it went a little > > into the opposing hole on the other side of the hat, and still left > > some taper at the end of the threads I could feel the grub screws > > cutting into for the last half turn to tight on the taps square > > butt. > > > > But I just chose to use a 5 or 6mm tap with a square end, for blind > > holes I assume. It working from the g38.2 measured length, went on > > thru to the other hole and totalled the threads at the bottom of the > > opposing hole. Diagnosing that I needed to stop it at least 2.5mm > > quicker, I put the 6mmx1 tap in the machine, also a square ended > > tap, and found the threads were usable but had to get froggy with > > the wrench torque to get past the tight spot at the bottom of the > > hole. This after I had reduced the g33.1 Z by 2.25mm. > > > > So, since I'm measuring the mounted tap at its tip, is there any > > quick way to make my code compensate for the taps tip profile? > > > > Or do I add another var next to the tpmm to be added to the stroke, > > possibly by calipering the tap tip from the tip to the first active > > thread? > > > > IOW, how do you folks deal with this? > > > > Thanks for any thoughts. > > I drill my pilot hole 80% of the minor diameter deeper , unless the > print doesn't allow for it,
Whats a print? ;-) The only place a picture of this exists is in my head. :) > I then add the measured length of the tip > of the tap to my tool length and make a few test holes, adjusting tool > length offset in the table until I get the desired results. That also shifts the starting point, which shifts the thread. By adjusting only the stop point at the bottom, I can repeat it in the same hole w/o mucking up the threads already cut. I don't make a lot of scrap that way. :) The only way I can see to fix it, requires a calibration per tap, and some way to track/id that tap. These aren't in the tool.tbl yet, and thats why I was asking for a bigger table a week or so back. Or measure and mark each tap and stamp it on the face of the hat like the size & tpmm is now. Thats not impossible, and may be the best way to keep it from getting lost. Thanks Jeremy. -- 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
