Abstract: An arrangement is disclosed for cutting information into a record carrier made of metal, particularly of copper by means of a diamond, with the diamond body being adjusted for cutting under a canting angle and being ground in such a manner that, deviating from the prior art manner, the cutting edge does not coincide with a diamond zone of optimum hardness but deviates from the optimum position by an angle which is preferably equal to the canting angle.

Abstract: Process for producing a sound recording cutting base, which includes precipitating a cuttable copper layer on a substrate from an electroplating bath, the copper layer having an initial grain size and having recrystallizing characteristics as a result of the bath's composition, convection and current density, characterized in that in order to extend recrystallization time, substances are added to the bath which, by their incorporation in the copper layer, stabilize the latter in such a manner that recrystallization is prevented or delayed, the substances including leveling agents added in effective amounts to prevent formation of layer-grain crystals of copper having a grain size which substantially exceeds the initial grain-size.

Abstract: A stylus assembly for cutting information in a recording medium comprises a stylus having a leading face; a mount comprising a bar having a groove extending in a face of the bar generally parallel to the length dimension of the bar. The stylus is received in the groove such that the leading face of the stylus is oriented away from the groove and slightly projects therebeyond in its entirety.