Abstract: Add-on components for a workpiece holder or vise, including a pair of jaws. A work piece lock element is moveable and lockable along a top surface of one of the pair of jaws. The work piece lock element can be or include a positive lock, such as including a threaded element, a rounded or spherical element, and/or a spring loaded ball. In embodiments, a row of detents is disposed in one of the jaws, and each of the detents is configured to receive the positive lock in one position. An adjustable side extension can be included for laterally securing workpieces in the holder. A pair of clips, each attached to a side of one of the pair of jaws, can be used to secure a parallel against the one of the pair of jaws. Parallel keepers can be used to reduce lateral displacement upon tightening the jaws.

Abstract: A tool head suitable for use in a machine tool for shaping the edge of a plastic sheet, which holds and shapes the edge of plastic sheet while a vacuum on the machine tool holds the center of the plastic sheet. Having such a desired edge renders the plastic sheet suitable for further manufacturing treatment.