Abstract: A method and device for machining an angularly disposed array of parallel longitudinally extending slots in a bore of a component, the method comprising the steps of: gripping said component (1) in a gripping means of a workholding device (2) mounted to a workholding spindle (3) indexable about a first axis; cutting said array of slots in said bore by a series of progressively deeper cutting strokes of a cutting tool (5), said tool mounted to a cutting spindle (7) rotatable about a second axis (8) substantially at right angles to and offset from said first axis; and the cutting of each slot followed by indexation of said workholding spindle (3); and during the cutting of at least one of said slots, relative movement between the component (1) and second axis (8) takes place due to movement of the component (1) along the first axis or movement of the second axis in a direction substantially parallel to said first axis or both.