An apparatus (2) for clamping a workpiece (22) in a machine. The apparatus comprises an inner nose portion (6) being rotatable about an axis of rotation and comprising a plurality of mounting surfaces (24, 26), and, an outer ring portion (4) rotatable about the axis of rotation and comprising at least one clamp (14) operable between, an unclamped position and a clamped position. In the unclamped position, the inner nose portion (6) is rotationally positionable about the axis relative to the clamp (14) such that a workpiece (22) positioned against the mounting surfaces (24, 26) may be oriented relative to the clamp to a position at which, with the clamp being operated to the clamped position, the workpiece is clamped against the mounting surfaces. The clamping results in a coupling of the inner nose portion (6) and the outer ring portion (4) whereby with a clamped workpiece, the inner nose portion and the outer ring portion are rotatable together and are positionable about the axis.