Abstract: A lapping assembly for lapping a group of workpieces including a pair of lapping discs and a cassette for positioning the workpieces between the lapping discs. The lapping discs are provided with two-component translational oscillations at the appropriate cutting speed, parallel to their working planes. This motion is effected using crank pins rotating about a coaxially positioned axis and elastic members (or swivel-supporting) members coupled to the body of the lapping machine to prevent the lapping discs from rotating. The cassette has an opening having a curvilinear shape for holding the workpieces, and protrusions which extend into the opening. The cassette is mounted on a support element and equipped with a drive to rotate it about a stationary axis. Alternatively, the cassette can be fixed during treatment and the lapping discs can be rotated at a speed less than the cutting speed.

Abstract: A finishing assembly for vibratory finishing of workpieces in loose finishing media includes at least one generally annular finishing chamber which is driven by a drive assembly and supported by a support housing. The drive assembly consists of a crank shaft and a drive shaft which are rigidly connected to each other through a wedge-shaped gasket and oriented such that the rotary axis of the crank shaft and the rotary axis of the drive shaft intersect with one another at a predetermined angle. The crank shaft rotates within a first bearing hub which is rigidly mounted within the chamber and the drive shaft rotates within a second bearing hub which is rigidly secured to the assembly housing and which is actuated by an electric motor. The spatial vibration of the finishing assembly can be adjusted using a wedge-shaped gasket and/or by providing for horizontal displacement of the first bearing hub from the second bearing hub.