Abstract: Device for centering and clamping a component (1) with a view to lapping it, comprising a rest (10) for applying the component (1) against a fixed stop (3), a first piston (7) with a long stroke and a second piston (8) with a short stroke interposed between the rest (10) and the first piston (7), anti-rotation means (18) for the component (1), a blocking element (12) for blocking the first piston (7) relative to its cylinder (6), as desired, and controls for, in succession,a)--advancing the two pistons (7, 8) in order to clamp the component (1),b)--blocking the first piston (7) relative to its cylinder (6) using the blocking element (12),c)--retracting the second piston (8) in order to unclamp the component (1),d)--introducing the lap (4) into the component (1) immobilized by the anti-rotation means (18) and, driving it in rotation, expanding the lap (4) until a pre-determined torque is established between the lap (4) and the component (1) ande)--advancing the second piston (8) in order to reclamp the centere

Abstract: Tooling for applying an abrasive belt on a machine for abrasive belt machining of cylindrical bearing surfaces comprises, for each bearing surface to be machined, an arm and three abrasive belt application shoes a first of which is mounted in a top median position on the arm and the other two of which are mounted in a bottom lateral position on two jaws articulated to the arm and coupled together in such manner that they can be clamped together. The arm carries a first shoe having a concave abrasive belt application surface subtending an angle greater than 90.degree. and less than 180.degree. and a gauge with two opposed and horizontally aligned sensors and each jaw carries a second shoe having a concave abrasive belt application surface subtending an angle slightly less than 90.degree. whereby when clamped around the bearing surface to be machined the three shoes together envelope the bearing surface to be machined over an angle of at least 270.degree.

Abstract: A tool for applying surface coated abrasives on a machine for abrasion machining of cylindrical bearing surfaces on workpieces such as crankshaft journals and crankpins comprises for each bearing surface to be machined a pivoted arm mobile vertically and three pads for applying surface coated abrasives. A first pad is mounted at a median top position on the arm and the other two at lateral bottom positions on two jaws articulated to the arm and coupled together so that they can be clamped together so that when clamped onto the bearing surface to be machined the three pads are disposed substantially at the three corners of an equilateral triangle. Each pad has a concave surface coated abrasive application surface subtending an angle of greater than 60.degree. so that after clamping the three pads of each arm enclose the bearing surface to be machined substantially completely.

Abstract: For the purpose of machining each journal (2,3) of the workpiece (1), the machine comprises three abrasive application blocks (13, 16a, 16b), one of which is mounted in a fixed position on the arm (7) and the other two are mounted on two jaws (14a, 14b) articulated on the arm (7), in such a way that, when the two jaws (14a, 14b) are clamped together, after the arm (7) has been lowered onto the journal to be machined, the three blocks (13, 16a, 16b) are arranged at the angles of an equilateral triangle and exert a uniform, controllable pressure on the workpiece (1).