1.1 This standard specifies dimensions for copper commutator bars over 6 mm in width and up to and including 18 mm thick in which the inclination of the two surfaces is constant throughout the width (see Fig. 1 ).
1.1.1 The bars may be in random lengths, in exact specified multiples of lengths for subsequent cutting, or as plain or shaped segments of specified lengths for assembly. The surface at the thick or thin edge may be radiused or flat.
1.1.2 This standard also includes tables of preferred widths for commutator bars and details of methods of checking dimensions ( see Appendix A).