On 22.01.17 11:08, Gene Heskett wrote: > The faceplate hub looks and measures pretty close to cylindrical, but > it is a rough surfaced forgeing or cast steel surface I am looking at, > and I'd druther it was trued, which means I'd have to separate it from > the chuck and turn it around on the spindle to gain access to taking > off a thou or 5 while making it cylindrical and concentric.
That'd work, and as ISTR the chuck isn't dead concentric now, not a lot of precious alignment has to be restored. If I had a screw-on chuck, then a bit of Murphy-insurance would be my priority too. ... > Its no biggie to me if I have to chuck up a 1/2" piece of A2, put a dial > of it and work the chuck over with a dead blow hammer to restore its > grippers to .0001" runout when I'm done. Its a medium priced 3 jaw with > 2 piece jaws. I have serious doubts it even has the ability to match > that if the 1/2" A2 is loosened & retightened. But I'll find out in due > time... Looking for alternatives to assault & battery, the jaws can be ground while expanded inside a ring, for concentricity in that role, but how would you grind the inside of jaws clamped on something? Drill a hole in each jaw when it's closed tight, fit pins, and then grip a ring on the outside while grinding? Pretty good is as good as an affordable self-centering chuck gets, I figure. And I guess that in use, you'll just perform all turning operations requiring concentricity in one workholding, so it doesn't matter if there's a thou or two of eccentricity. Erik ------------------------------------------------------------------------------ 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
