Abstract: An apparatus for grinding two flats of substantially the same dimensions in portions of a conical tip of an element. The apparatus comprises, in combination, a rotatably mounted holding member for holding the element; a rotatably mounted abrasive surface for grinding the tip portion; an index wheel drivingly connected to a flipping lever on the holding member for rotating the element between the two tip portions wherein the point of the tip does not disturb or penetrate the abrasive surface during rotation; and a pivot bearing upon which the holding member is pivotally mounted for contacting the tip portions with the abrasive surface so that a constant force is applied to the tip portion being ground, wherein the tip point does not disturb or penetrate the abrasive surface and wherein the tip remains in contact with the abrasive surface during rotation.

Abstract: A video disc player having a signal pickup stylus for engaging a disc record is equipped with a steering device to provide three degrees of motion to the stylus. The stylus is secured to a stylus arm, the second end of which is compliantly mounted to a support structure. A permanent magnet in the shape of a cruciform with a like magnetic pole at each extremity is secured to the second end of the stylus. Magnetic field producing electric coils are arranged proximate each of the extremities of the cruciform and secured to the support structure so that energization of the coils will apply force to the cruciform causing the stylus arm to pivot about its compliant mounting.