Patent ID: 7540801

Claim:
An oscillating grinding machine, comprising: a driving motor surrounded by a body; and a drive shaft that cooperates with the driving motor and comprises a grinding head as a support for a flexible grinding product, the grinding head being mounted in bearings for free rotation around the drive shaft; wherein the drive shaft is in two pieces, comprising a main shaft and an eccentric shaft arranged rigidly thereto in such a manner that the eccentric shaft comprises a centre line that assumes an angle against a corresponding centre line comprised by the main shaft and that the grinding head is arranged to the eccentric shaft for an eccentric placement in relation to the main shaft; whereby the grinding head is arranged to assume an oscillation in a substantially spherical plane created by the rotation of the main shaft and the eccentricity and inclination of the eccentric shaft in relation to the main shaft; wherein the drive shaft of the grinding machine is replaceable; and wherein the centre line of the eccentric shaft assumes an angle against the centre line of the main shaft that differs from the angle before the replacement.