Abstract: A machine for treating spherical surfaces of parts with a magnetoabrasive powder held in a magnetic field created in the gap between two magnets comprises a horizontal circular channel acting as one of the magnets and a rotor arranged above the circular channel and carrying spindles around the circumference, the lower end of each spindle being provided with another magnet adapted for holding the workpiece. Each spindle has a mechanism which imparts to it a rotary and, simultaneously, recessional motion, the precession center being located mostly on the line of centers of the generatrix of the circular channel.

Abstract: The machine for three-dimensional polishing of workpieces shaped as solids of revolution in a magnetic field using ferromagnetic abrasive powder comprises an electromagnetic system having an air gap for the ferromagnetic abrasive powder to retain therein, spindles for the workpieces being machined to hold, a mechanism for traversing the spindles adapted for the workpieces being machined to pass through the air gap of the electromagnetic system, and mechanisms for the spindles to rotate round their own axes and oscillate. The spindle oscillating mechanism comprises a cam held in position to the spindle and adapted to engage, with its shaped face, the eccentric roller whose shaft is square with the axis of rotation of the spindle carrying the cam.