I just recently for the first time used a boring head in my milling machine to bore a hole. This act has me wondering about some things about boring heads. The bar has no flats at the mounting end and is held in the head with a set screw. This allows for the cutting tip flat to be in any 360 degree position relative to the offset motion of the head. Though the operation of the task worked quite well, it has me thinking this through a little more. What I did was visually (by sight) set the cutting tip flat parallel to the head offset motion with the cutting edge outward of center. Questions: Are there set-up techniques for proper cutting tip orientation of the boring bar to the boring head? What is the proper angle of the cutting tip to be set at? Though I used this set-up to bore an ID, has anyone turned an OD this way?