My first project after purchasing a 6x26 mill. I needed a way to round the corners on this motor mount and this is what I came up with. 2-1" bearings, short piece of 1" shaft with a 3/8" threaded hole in the end and 2-3/8"x1"x3" pieces of stock. Used 2 bearings because they were floaters. Mounted the bearings back to back with the 3/8"x1" stock in between to be held in my vice and the shaft is held in place by 4 set screws. I used a counter sink machine bolt to hold the piece that I am rounding in place. This makes sure that the hole will be centered. The corners turned out as nice as the straight cuts. You can see pictures at http://www.flickr.com/photos/stanleygill/sets/72157632458663968/. Please advise me of other methods since I am new at this. Any help will be appreciated.