Yet another possibility: two pieces of matched diameter stock somewhere between 25-50mm diameter (non-critical) and 25-75mm long. Non-critical hole down the center of each one to fit a clamping stud.
Put two t-nuts in the center t-slot, bolt one cylinder down using one of the nuts in a arbitrary location. Set the part over the cylinder, insert the second cylinder and slide them apart until the two cylinders are touching the inside of your big bore at the left and right sides. Tighten down the second cylinder. Carefully lift the part up and off. The gap between the cylinders is centered on the big bore. Use the coaxial indicator (spindle off, rotate manually) to center the spindle in the gap. Lock X. Replace part, indicate base perpendicular to spindle, clamp down. On Thu, Mar 30, 2017, at 09:00 AM, andy pugh wrote: > On 30 March 2017 at 13:41, Cristian Bontas <cristianbonta...@gmail.com> wrote: > > You could turn a cylinder that fits snugly in the large hole. > > Certainly a possibility, but at 120mm quite a big chunk of material to > use just as a jig. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1916 > > ------------------------------------------------------------------------------ > 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 -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ 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
