For many-off square holes the same size make a square broach: https://www.youtube.com/watch?v=MYI1slVGziU
For one-off squares holes in a variety of sizes i would: 1) Set up the part in the 4-jaw chuck and bore to AF size. 2) Use the chuck jaws to index into 4 positions 3) Use a CNC lathe to "slot" in the corners using a bit of square tool steel smaller than the bore size Though, actually, what I would do is cut a slot in the top and rely on two flats only to do the work. In fact, what I would really do is use one of my floating tap holders. That forgives a bit of slop on the Z-axis better. -- 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
