Abstract: An embodiment of the present invention is a gripping unit for engaging a workpiece with the unit including a first assembly, a second assembly pivotally connected to the first assembly and having a limited range of pivotal movement relative to the first assembly. The first and second assemblies define a central opening of the gripping unit. Each of the first and second assemblies includes a V-block oppositely disposed from one another and capable of axial translation within the central opening to engage the workpiece. An actuator is arranged and designed to pivot the second assembly relative to the first assembly in the direction of the central opening.