Patent ID: 6262839
Filing Date: 2001-07-17
Classification: B23Q,B27C,G01B,Y10T

Abstract:
An apparatus for performing a forming operation on a work piece, the apparatus comprising:a frame;a translatable component movably mounted within the apparatus;a work piece opening partially defined by the translatable component;a scale carried by the frame adjacent to the translatable component, the scale being marked with indicia incrementally representing the position of the translatable component relative to the work piece; andan optical unit attached to the translatable component, the optical unit adapted to project an image of at least a portion of the scale, the optical unit including an optical element having at least a first side, a second side, and a third side, the optical unit further including a first locating line positioned relative to the first side and a second locating line positioned relative to the third side, the first and second locating lines appearing co-linear with respect to each other when the image is viewed at a predetermined angle through the third side.