axles is illustrated and generally designated by the reference number 10 the boring apparatus 10 includes an attachment and adapter assembly 12 which secures the apparatus 10 to the brake flange of a motor vehicle axle as illustrated in fig7 and as will be described subsequently and provides longitudinal adjustment as will also be described subsequently attached to the adapter assembly 12 is a radial adjustment assembly 14 which provides orthogonal adjustment i e adjustment along axes normal to one another and disposed in a plane normal to the axis of rotation of the boring tool a bearing assembly 16 is secured to the adjustment assembly 14 and provides secure rotational support to an elongate boring bar assembly 18 finally the apparatus 10 includes a boring bar drive assembly 20 which rotates and advances or retracts the boring bar assembly 18 referring now to fig2 the attachment and adapter assembly 12 is illustrated and includes a first annular plate 26 defining a large center aperture or opening 28 and a plurality of curved stepped slots 32 the curved slots 32 preferably define circumferential slots 32 having a constant radius from the center of the first annular plate 26 the slots 32 include a centrally axially disposed web or lip 34 which defines a shoulder.