Abstract: A centering apparatus intended for use with a woodworking device having a cutting tool and fence for positioning the center of a work-piece in exact alignment with the center of the cutting tool. The centering apparatus comprising an elongate member having a first end, a second end, parallel longitudinal sides and a center hole located at the center of the elongate member. A swiveling right angle bracket for engaging one of two opposing parallel surfaces of a work-piece is connected to the first end. Connected to the second end is a contact member for contacting a guiding fence. A cylindrical dowel pin for pivoting the centering apparatus about the center hole of the elongate member is aligned with the geometric center of the cutting tool with one end of the cylindrical dowel pin extending through the center hole of the elongate member and the other end positioned within the chuck of the cutting tool.

Abstract: A device for slidably positioning a power tool accessory. The geometry of the device is that of a specially modified channel with the interior opposed surfaces of the two legs of the channel being sloped like a truncated wedge. Sections of the sides of the device are partially separated from the main body so as to permit them to spring outwardly under pressure imparted by wedging members so as to cause the sprung sections to either move towards, or frictionally engage surfaces within guiding slots in a major surface of the power tool (e.g., table saw). The wedging members are controlled by conventional machine screws which permit a continuous range of adjustment.