Shear machine with replaceable shear assembly

A shear machine for irradiated nuclear fuel elements and of the kind comprising, a frame, a reciprocating shear blade carried in the frame, a support block for the fuel element, the support block being complementary to the shear blade for shearing the fuel element, a ram for driving the shear blade, a pair of side-by-side clamp members movable towards and away from the support block to hold the fuel element in a shearable position against the support block, a pair of co-axial rams each for actuating one of the clamp members, a readily replaceable shear assembly unit housing said shear blade, said support block and said clamp members, means, comprising an aperture in the driving ram and a hook shaped projection on the shear blade which is received in the aperture in the driving ram, for releasably connecting the blade and ram such that the connection between the ram and blade is releasable by relative lateral motion, and means, comprising radial projections on each clamp member and the actuating ram therefor which are reversably interengageable by a combination of relative linear and rotational motions in the manner of bayonet couplings, for releasably connecting each said clamp member and the actuating ram therefor.