and direction of rotation of the motor and or control the engagement shifting or disengagement of the gearbox controllers are well known to those skilled in the art and therefore no further discussion is needed the details of how the inner vessel 34 is drive with respect to the outer vessel 32 are provided in u s pat nos 5 140 783 5 507 685 and 5 848 929 which patents are incorporated herein by reference in their entirety another drive system which can be used in the present invention is disclosed in co pending application entitled u201c high speed centrifugal processor u201d attorney docket no 9436 15 u s filed concurrently herewith that application is also incorporated herein by reference in its entirety 0039 fig6 shows one example of an arrangement for mounting the saw blades 10 in an inner vessel 34 a central rod 44 is located within the interior of the inner vessel the saw blades 10 are mounted on the rod 44 and spaced apart by spacers 46 the height of the spacers 46 must be sufficient to permit the finishing media to pass between and act upon the sides of the blade a nut or similar fastener 48 is attached to the end of the rod 44 the rod is preferably fixedly attached to the inner vessel 34 the walls of the inner vessel 34 should spaced from the tips.