Duplicating machine for tubular keys

A duplicating machine for tubular keys, said machine comprising:

• a base, a generally cylindrical cutter rotatably mounted about an axis and having a cutting face transverse to said cutter axis;
• on said base and having a radius generally equal to the radius of a tubular key notch, a mount at a fixed location on said base spaced from said cutter, a key carrier supported by said mount for shifting movement on an axis parallel to the axis of said cutter and rotative movement to spaced angular locations relative to the axis of said carrier, a work holder on said carrier for gripping engagement with the stem of a blank key to be cut by said cutter upon longitudinal carrier shifting movement, a control holder on said carrier for holding a key to be duplicated with its stem in fixed generally parallel and aligned relation with the stem of a gripped key blank, and a guide having a radius generally equal to the radius of a tubular key notch fixed relative to the axis of said cutter, said guide having an axis parallel to the axis of said cutter and located in similar relation to a key on the control holder as a key blank held by the work holder is located relative to the cutter, whereby control holder movement by a key to be duplicated in guided relation with said guide effects carrier shifting and rotative movement for corresponding cutting by said cutter of a key blank held by said work holder.