Abstract: An adapting device is provided including a dead center with a cylindrical body and a live center with a tubular body, both of the centers including tapered center defining noses. A pair of yokes are adapted to secure the centers to V-blocks of a V-block instrument with their axes coincident with one another. A live center useful for adapting a V-block gauging instrument into a bench-center instrument is provided having a tubular body with a centering member slidably received therein. The centering member includes a neck portion extending through a reduced diameter opening in the tubular body. A spring biases the member so as to engage a piece to orient it for taking measurements, and a cam member pivots about the neck portion to retract the member when a piece is being mounted. A locking member is provided having a metal screw with a hex opening therein and a thumb grip secured over the screw head. An opening is provided in the thumb grip to allow access to the hex opening.

Abstract: A measuring and gauging instrument has a column secured to a base, a carrier adjustably movable along the column to a selected position and releasably mounting a selected anvil thereon, and a dial indicator mounted on a support adjustably movable to a selected position relative to the column. The dial indicator provides a relative measurement of a workpiece supported by the anvil and engaged by the dial indicator and, depending on the particular configuration of the anvil employed, gives an indication of workpiece diameters, groove depths, bore and slot locations, or the like.