Abstract: The invention relates to a centering bushing for centering a material bar which is supplied to a chuck of a lathe. An outer construction and an inner construction arranged therein are rotatably arranged about the longitudinal axis of a material bar. The inner construction is arranged to be rotatable with respect to the outer construction. The outer construction has means to fix the inner construction with respect to the chuck. The outer construction has a centrifugal force device which produces a force corresponding to the rotational speed. The inner construction has a centering device which leads to a centering of the material bar due to a force exerted on the centering device. A force transmission unit is arranged between the outer construction and the inner construction and ensures that the inner construction can rotate, with respect to the outer construction, and transfers the force produced by the centrifugal force device to the centering device.

Abstract: The invention relates to a centering bushing for centering a material bar which is supplied to a chuck of a lathe. An outer construction and an inner construction arranged therein are rotatably arranged about the longitudinal axis of a material bar. The inner construction is arranged to be rotatable with respect to the outer construction. The outer construction has means to fix the inner construction with respect to the chuck. The outer construction has a centrifugal force device which produces a force corresponding to the rotational speed. The inner construction has a centering device which leads to a centering of the material bar due to a force exerted on the centering device. A force transmission unit is arranged between the outer construction and the inner construction and ensures that the inner construction can rotate, with respect to the outer construction, and transfers the force produced by the centrifugal force device to the centering device.

Abstract: The collet stop (1) comprises a clamping disk (15) placeable on the edge (17) of a collet (2) and a chuck body (21) displaceable relative to this clamping disk, having three radially unscrewable tapped bolts (25, 26, 27) which rest against the rearward ends of the slots (6) of a collet. By means of a tightening screw (31), the chuck body (21) can be displaced relative to the clamping disk (15), and the conical ends (34), provided with a hexagonal socket, of the tapped bolts caused to rest against the slot ends. Screwed into the tightening screw (31) is a threaded rod (48) which is provided at its end with a stop disk (52) for the workpiece to be machined. The collet is not crushed or deformed by the collet stop, the collet stop being insertable as a whole into the collet from the rear. As a result of the conical ends (34) of the tapped bolts (25), the collet stop (1) rests against all three ends (38) of the slots (6) of the collet.