| 摘要 |
PURPOSE: A method and apparatus is provided which manufactures a plurality of longitudinally extending slots in the bore of a component such as an automotive power steering rotary valve. CONSTITUTION: The machine has a device for machining slots(21) longitudinally disposed within the bore(16a) of a sleeve(1), comprising a work holding device for holding the sleeve(1), at least one cutting tool set up on a cutting spindle, the axis of the cutting spindle being offset from and substantially at right angles to the axis of the sleeve, means of supporting the cutting spindle for angular reciprocation to effect cutting strokes of the tool relative to the surface(17b) of the bore, in feed means to permit the cutting tool to execute a succession of progressively deeper cuts in relation to the bore of the sleeve, characterized in that when the cutting tool is cutting at least one of the slots, the cutting tool engages the surface of the bore at a location substantially closest to the axis of the cutting spindle. |
