The power appliance, which has a rotating workpiece movement, includes a appliance housing with a driving assembly which moves a driving mass (50) back and forth through a distance. The appliance also includes an output assembly which includes a workpiece element and a coupling assembly (54) which connects the driving mass to the output assembly, wherein the coupling assembly includes a torsion member having a node point (58) therealong. A support element is connected between the node point and the housing. The driving assembly operates in such a mode that the workpiece element moves in the opposite rotational direction from the driving assembly, wherein the moments of inertia of the output assembly and the driving assembly, respectively, oppose each other, thereby substantially preventing coupling of vibrations to the housing.
