Apparatus and method and means for removing surface defects from a workpiece

Abstract From the Canadian patent

Apparatus and a method for use thereof to remove surface defects from a formed workpiece having a rotary axis about which the workpiece is designed to rotate. A plurality of rotary tools preferably three, of the apparatus are rotatably mounted in spaced relationship to each other to receive the workpiece therebetween in engagement therewith during rotation of the tools and the workpiece. Pressure applied to each of the tools independently of each other tool maintains an engaged condition between the tool and the workpiece while allowing outward tool movement upon engagement with a surface defect such that the rotary workpiece axis remains at a fixed location. Extendable and retractable …