Abstract: An abrasive flow machining and polishing apparatus is provided having a hydraulically actuated reciprocating piston (42) and a extrusion medium chamber (10) adapted to receive and extrude a visco-elastic dispersion of an abrasive unidirectionally across the internal surfaces of a workpiece (40) having internal passages (41) formed therein to perform abrasive work on said surfaces. A fixture (24) directs flow of the viscoelastic abrasive dispersion from said hydraulic extrusion medium chamber (10) into the inlet of internal passages (41) in a workpiece (40), while a collector (30) is set to gravitrimetrically collect flow of the viscoelastic abrasive dispersion as it extrudes from an outlet of the internal passages and drops into the collector. The extrusion medium chamber (10) is provided with an access port (16) to periodically receive gravimetric return flow of the viscoelastic abrasive dispersion from the collector (30) into extrusion medium chamber (10).

Abstract: unidirectional abrasive flow machining is achieved by a pair of extrusion chambers, whereby a first workpiece is fixtured to a first of said chambers and an abrasive medium is extruded from the first chamber through the first workpiece, and upon exiting the first workpiece, is allowed to fall into and be collected within the second chamber. Thereafter, the first workpiece is removed and a second workpiece is fixtured to the second chamber so that the abrasive medium collected therein is extruded through the second workpiece and upon exiting the second workpiece, is allowed to fall into and be collected within the first chamber.

Abstract: Fluid flow through orifices, particularly where flow rates are to be controlled or metered, is improved by employing abrasive flow machining to achieve a target flow resistance in the orifice.

Abstract: A mechanism for imparting relative orbital motion to at least two associated driven elements. The driven elements are driven in an eccentric path, usually with a common drive axis, where the angular displacement of each such path is controlled while relative rotation of the driven elements is precluded.