On Wednesday 07 March 2018 00:29:43 Erik Christiansen wrote: > On 06.03.18 23:05, Gene Heskett wrote: > > It appears that its well nigh impossible to get a firm enough grip > > on a tap shank, and on the smooth, unkeyed TTS ER-32 holder, to > > reliably lock a tap for rigid tapping. I've considered buying > > ER-32's with square sockets, but for >8mm taps, the TTS > > adapter/holder will spin in the R8. > > The only thing I could suggest is the guts of some "tap-hats" I made - > that's just a length of 1/2" round drilled/bored to take the tap > shank, and cross-drilled & tapped for four 3mm grubscrews to tightly > grip the square. That should go into a collet nicely. You could > perhaps slit longitudinally for that application, but a good tap fit > should make that unnecessary. Concentricity will be better if the > outside is turned, remedying both stock out-of-roundness and chuck > eccentricity, I figure. > > As I used them manually, I had a drilled hole in the back, to slip > over the drill bit still in the mill/drill chuck, for plumbing during > hand tapping of the hole just drilled. A slice of 1" round, drilled to > fit over the 1/2", and slotted externally to take the screws of a 1" > dieholder slipped over, was added for manual tapping. (I've yet to > find an adequate tap holder, and the die holder doesn't get in the way > of the plumbing hole in the top.) > > The DIY path ensures you don't clutter the place with too many of 'em. > I've only made three so far. (Made mine in brass, as it's delightful > to machine.) > > Erik
And the grub screws stayed tight? The die holder I'd have to make as all mine are handled for 2 handed use.. Ignore that grinding noise, its just me thinking. Send me a PM with a couple pix if you can. Thanks Erik. -- 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
