70 is sized to stabilize the cutting tool 62 to prevent vibration or mechanical deflection as the cutting edge 66 cuts the tube 2 to form the coil 10 preferably the feed rate of the tube 2 through the cutting device 60 is coordinated with the rotation speed of the cutting tool 62 in order to form a uniform coil 10 in the same manner as described above in connection with the cutting device 6 in accordance with the first embodiment the central shaft 64 is preferably rotated via a controllable pneumatic or electric motor referring now to fig1 and 12 a third embodiment of the cutting device 80 in accordance with the present invention is shown the cutting device 80 includes a cutting tool 82 having a cutting edge 83 the cutting tool 82 is mounted on a ring gear 84 for rotary movement about the tube 2 the ring gear 84 is supported by a roller bearing 88 mounted on a support 90 the ring gear 84 is driven via a drive motor 92 having a drive gear 94 which engages the gear teeth 86 of the ring gear 84 the speed of the motor 92 is coordinated with the extrusion rate of the tube 2 in order to cut the uniform coil 10 preferably the cutting device 80 is located adjacent to the extruder dye face 96 and the cutting tool 82 is moved along the dye face 96 as the tube.