Patent ID: 8161853
Filing Date: 2012-04-24
Classification: B23B,Y10T

Abstract:
1. A centering chuck for centering a material bar that is supplied to a collet chuck of a lathe, characterized in that the centering chuck comprises an outer structure that is rotatable about the longitudinal axis of the material bar, the centering chuck comprises an inner structure that is rotatable about the longitudinal axis of the material bar, the inner structure being arranged substantially within the outer structure, and the inner structure being arranged so as to be rotatable in relation to the outer structure, the inner structure is set up to enable the material bar to be guided through the inner structure, the outer structure comprises means for fixing the outer structure in relation to the collet chuck, the outer structure comprises a centrifugal force device that produces a force corresponding to the rotational speed, the inner structure comprises a centering device, which, owing to a force applied to the centering device, causes the material bar to be centered, and there is arranged between the outer structure and the inner structure a force transfer device that ensures that the inner structure is rotatable in relation to the outer structure, and that transfers to the centering device the force produced by the centrifugal-force device.