It might be slightly more accurate to use a tooling ball in the centre of the 120mm disc rather than a dowel pin. They have a shoulder so tilt would not be an issue.
> -----Original Message----- > From: John Kasunich [mailto:jmkasun...@fastmail.fm] > Sent: Thursday, March 30, 2017 3:27 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Milling setup question > > Elaborating on my own post: > > On Thu, Mar 30, 2017, at 03:21 PM, John Kasunich wrote: > > Why can't it be as 120mm diameter x 5mm thick disk? > > Turn said disk on the lathe, and bore a concentric but much smaller hole in > the center. Then you can indicate to either the hole or a dowel inserted in > the hole. > > There would be at least two, maybe four, other holes, non-critical, for > bolting > the disk down to the table. Bolt it down loosely with the table empty, > indicate such that spindle points thru the center of the vertical dowel, > tighten > bolts and check again. Then set the part over the disk, indicate base > perpendicular to spindle, and clamp part 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 > > > -- > 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 ------------------------------------------------------------------------------ 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
