Arrangement and method for grinding spherical products

A method for grinding spherical products by means of at least one handheld grinding machine having a drive motor surrounded by a frame, whereby

• the drive motor controls a eccentrically constructed drive shaft, which cooperates with a fastening spindle,
• the fastening spindle is set in an angle relative to the drive shaft thus providing a spherical oscillating movement of the spindle,
• hereby an oscillation center of the fastening spindle is set to coincide with the imagined point, where a center line of the drive shaft and the center line of the fastening spindle meet, while this meeting point is to be identical with the center of the spherical product to be grinded,
• the fastening spindle is provided with a clamping plate,
• the clamping plate is formed to comprise a concave bearing surface,
• a grinding product being formed and fitted on the fastening plate, and
• the grinding product adopting a position with accuracy of shape on the concavely shaped surface of the clamping plate, so that
• the grinding product forms a contact surface in the interface, in which the grinding product cooperates with the spherical product,
• the contact surface adopting a radius of curvature arranged to substantially correspond to the radius (r) of the spherical product against which it is placed, and
• the grinding is performed with a spherically oscillating grinding movement, whose radius is adapted to the radius (r) of the spherical product and simultaneously coincides with the radius of curvature of the contact surface.