Abstract: A cavity key duplicating machine having an upright drill which may be moved upward and downward and has an adjustable stroke, an upright guide which may be moved upward and downward together with the upright drill, as well as the left and right vises secured on an upper carriage slidably secured on a lower carriage slidably secured on a base. A ring-shaped stroke adjuster is releasably secured on a pinion shaft rotatably secured on a case, and having an inner pin formed thereof in order that the inner pin can be stopped by a fixed pin mounted on the side of the case when it is rotated by the pinion shaft for the control of the stroke of the upright drill.

Abstract: An automatic key cutting machine having a key carriage can be pivotably moved by means of a torsion spring, and can be moved leftward and rightward along a guide rod by means of a reversible motor as well as a pair of microswitches in order to effect the key cutting automatically. A snap lock is provided on the key carriage for enabling the latter to be locked in such a position that the key blank is moved away from the milling cutter for the convenience of releasing the key sample or securing the key blank on the key carriage.