A stent crimping assembly is provided for crimping a stent from a first diameter to a reduced second diameter. The crimping assembly includes a plurality of movable wedges disposed about a rotational axis to form a wedge assembly. Each wedge includes a respective first side and a second side converging to form a tip portion. The tip portions are arranged to collectively form an iris about the rotational axis thereof. The iris defines a crimp aperture about which the movable wedges are disposed. A control unit is electronically programmed to control the mechanical components. A method of calibrating the control unit includes inserting a quill of known diameter into the iris and reducing the diameter of the iris onto the quill.