On Saturday 19 May 2018 22:03:58 andy pugh wrote: > On 20 May 2018 at 02:41, Gene Heskett <[email protected]> wrote: > > But how best to prevent the drill bit from doing the sailors > > hornpipe dance when the brass first touches it? Thats the $64 > > question. > > I would take a completely different approach, I would make a fitting > for the lathe spindle that takes R8 tooling. > My tailstock has yet to be aligned. I could grab these in an ER-40 collet which has under a thou of runout, and do it that way I suppose.
> I haven't done this on my lathe, because I use BT30 tooling, but I do > have a fixture for that. > > On my old lathe it was a block that screwed on to the spindle nose, > but the Holbrook has a big enough spindle that the adaptor is MT4.5 on > the OD to fit the lathe spindle and BT30 on the inside for > mill-spindle tooling. Whereas my bigger lathe has a short MT5 internally, in which I have an adapter to 5C, then to an ER-40. Getting all that to run true after finding the spindle was bent, was at least 2 weeks worth of fun as I had to start by trueing up the MT5. Getting all that running true meant working on register clearance, so I could move the chuck enough to put it back plumb, and grinding the faceplates back to true. And a hundred dollar bill to grizzly for the makings of a new 5C adapter that actually ran true. But since the ER40 has sub thou runout now, that may not be such a bad idea. I'll look at it tomorrow. Thanks Andy. -- 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
