Method and apparatus for self-aligning boring bar

Abstract From the Canadian patent

Method of horizontally boring generally aligned openings in a series of spaced walls of a workpiece which includes: supporting a rotary spindle at one end to controllably permit axial movement of such spindle the, spindle carrying a rotary cutting tool at its opposite end; axially advancing the opposite end of said spindle successively through the series of spaced walls to machine the sides of the axially leading and trailing openings; supplying low pressure fluid to stations (i) spaced circumferentially and axially along the outer surface of said spindle, and (ii) located so that at least some of said stations align transversely with the sides of the lead opening while one of the trailing …