Patent ID: 7650822

Claim:
A machining apparatus for making a plasticizing barrel, comprising: a clamping device for securing a plasticizing barrel which is defined by a symmetry axis, said clamping device constructed for rotation about a rotation axis and for off-center disposition of the plasticizing barrel with respect to the rotation axis to thereby cause the plasticizing barrel to wobble about the symmetry axis, when the clamping device rotates; and a machining unit for providing the plasticizing barrel with an internal conical bore, defined by a cone angle, for receiving a screw, said machining unit having a turning tool which is movable linearly back-and-forth in a direction of an axis which extends in relation to the rotation axis at an incline of about half the cone angle of the conical bore, wherein the conical bore being formed by the machining unit has a center line which defines the rotation axis.