Why not swap 2&3? Machine base flat and machine keyway for the table. Then mount to the table and indicate off the table slot to bore the hole exactly on center? By default they will be parallel.
On Thu, Mar 30, 2017 at 7:02 AM, andy pugh <bodge...@gmail.com> wrote: > If you have a part with a large bore through the middle, how do you > set up to machine a hole exactly perpendicular to the axis of that > bore? > > I imagine that this is quite a common problem, so must have a common > solution? > > My particular setup puzzle is analagous to this, except that I will be > using the horizontal spindle. > > Machining this casting: https://goo.gl/photos/6QhNnqjzRuSJJpva7 > > The order of operations will be, starting with the raw casting: > 1) with the large flat face clamped down to the table machine the base > flat. > 2) Now clamp the base to the table, face off the large flat face and > machine the large bore. > 3) Return to the original setup and machine a key-slot in the base > _exactly_ on the axis of the large bore. > > 3) is the problem. I can indicate the base to make sure that is > perpendicular to the spindle axis, but how do I make sure that the > bore axis and the spindle axis intersect? > > -- > 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 > ------------------------------------------------------------------------------ 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