Abstract: A device for producing linear vibratory motion includes, in the preferred embodiment, an electric motor of the contra-rotating type, i.e. one in which both the rotor and stator rotate about a common axis and in opposite directions. One or more pairs of eccentric weights are provided, one weight of each pair rotating with the rotor and the other with the stator. Gearing is provided to assure synchronized rotation of the rotor and stator and to determine the angle of the plane in which the weights are aligned and, hence, the plane along which the vibratory motion is directed.