Abstract: A separator of the type having interleaved rotating discs is constructed with a first shaft having a locating ring welded to the longitudinal midpoint thereof and a second shaft parallel to the first shaft having a feed disc welded to its longitudinal midpoint. Feed discs and intermediate spacers are removably mounted on the shafts with the feed discs on one shaft overlapping and centered between the feed discs on the other shaft. Each feed disc is cut from steel plate, is placed on a splining shaft of a lathe head with one face of the disc in abutment with the ends of three posts defining a plane and a first groove is skin cut in the other face of the disc. The disc is then reversed on the lathe head, and a second groove is skin cut in the opposite face to a depth leaving a predetermined thickness between the groove bottoms whereby the feed discs can be accurately positioned and rotate without interference with one another.