Slotted component and method of manufacture thereof

A machine for machining slots longitudinally disposed within a bore of a sleeve, comprising a work holding device for holding said sleeve, at least one tool head carrying cutting means, said tool head mounted on or integral with a cutting spindle, an axis of said cutting spindle being offset from and substantially at right angles to an axis of said sleeve, means supporting said cutting spindle for angular reciprocation to effect cutting strokes of said cutting means relative to the surface of said bore, infeed means to permit said cutting means to execute a succession of progressively deeper cuts in relation to said bore of the sleeve, characterized in that said cutting means comprises two finger-like cutting tool holders, each of which carries at least one cutting tool, and at least one cutting tool carried by one of the two finger-like cutting tool holders has a cutting tip of different width to that of a cutting tip on the at least one cutting tool carried by the other finger-like cutting tool holder.