The next standard size smaller than 3.3mm is #30 which is 0.129 rather than 0.125.
> -----Original Message----- > From: Gene Heskett [mailto:ghesk...@shentel.net] > Sent: Tuesday, April 10, 2018 4:25 PM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] depth stops for R8 while making tap hats? > > Hi guys; > > I find, at least for the remainder of this project, that I need some sort of a > depth stop to reliable reposition the 4mm tap I'm useing, currently in a 3/16" > R8 collet. A collar on the tap would work but I've not been able to locate a > suitable one. I've got the tap in a glob of g02 with the r8 tightened on it, but > the 3/16 R8 will likely spring it loose as theres quite a bit of collapse by the > time Its got a good enough grip on the tap. > > Anybody else have a better idea for a depth stop? > > And looking around for another 3.3mm tap drill, which is > 0.129921259842519685", its apparent that the next drill down is a 1/8", and > the tap will tolerate that .004 undersize ok in brass. But I found some > 3.3mm's over in Andy's stomping grounds on ebay, in 10 packs, and here > about 2 weeks faster than the Chinese versions, but fleabay has been playing > with their card processing (again), giveing no opportunity to adjust the > number of 10 packs, so I only have 1 pack of 10 coming. I sent ebay a mild > nastygram because I really wanted 2 packs to save a few cents on postage. > > That teeny little 8mm square butt on the drawbolt is a PITA, too small to > easily spin with fingers after its been loosened with that watch makers sized > wrench, but I just found a 5/16" 8 point socket on a 1/4" adapter in an 18 volt > sorta hammer drill works, and if I can get the tap depth fixed, then I can series > all three operations into one file with tool changes between them. With the > drill to run the drawbolt, that ought to triple the production speed for these > things. > > If anyone ever designs a tool changer for a G0704 that doesn't impinge on its > working envelop, plz advise. > > What I've done so far looks good. I'd go on and actually mount this tap in the > first one, but I'd likely loose the current home+touch-off offsets of the current > setup. Or maybe I could setup the next 2 or 3 coordinate maps? Thats a > thought... mumble mumble... > > -- > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
