Abstract: An apparatus for holding a workpiece having a support table, a plurality of elongated workpiece supports extendible from the support table, a plurality of a clamp assemblies, and a processing machine. Each clamp assembly is positioned about a portion of a corresponding workpiece support. The clamp assemblies are moveable between a clamping position wherein the clamp assemblies support the workpiece support in a selected vertical position and a non-clamping position wherein the workpiece supports are moveable so that the position of the workpiece support is changeable. The processing machine is in communication with the clamp assemblies for controlling the position of the clamp assemblies, and the processing machine has an end effector engageable with the workpiece supports above the support table to permit the processing machine to move the workpiece supports to selected positions when the clamp assemblies are in the non-clamping position.