On Saturday 12 May 2018 13:59:32 James Isaac wrote: > A message close to the head problem email is: > > On 10 May 2018 at 12:22, Gene Heskett <[email protected]> wrote: > > > This would, if a 3/4" R8 collet could be found with a D shaped > > > bore, be yet another way to remove one potential slip point in > > > trying to hold a tap for rigid tapping. > > > > Buy a small-bore R8 collet and have it wire spark-eroded to a > > D-shape, perhaps? > > > > (You could consider plunge-eroding it yourself, I suppose) > > > > -- > > atp > > I suggest using a Broach. > > > A specially crafted hand tool, " . . . forced through an opening, or > along the outside of a piece of work, to enlarge or change the shape > of the hole or to form the outside to a desired shape." > > The descriptive text is taken from "Technology of Machine Tools, > seventh edition. > > The book has no guidance on how to specify broach sizing. > > > Putting in Broach to Google led me to "d shaped broach", > > and the sixth link was a > www.practcalmachininst.com<http://www.practcalmachininst.com> > reference to a 2005 question. > > > James Isaac. > Not sure if thats a feasible idea James. I pretty well wiped out 2 carbide mills making that scallop for the head of a 4mm cap screw in 3 of those Korean R8's.
Them is tough critters indeed. :( > ---------------------------------------------------------------------- >-------- 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 -- 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
