Method and Apparatus for Measuring the Angular Orientation Between Two Surfaces

A device and method are disclosed that measure the relative angular orientation between two surfaces. Two frames are mounted on the two surfaces to be measured. A collimated light is reflected between the frames and its position is read on a scale. The frame with the collimated light is flipped over and a second position measurement is taken. The difference in position is used to calculate the non-parallel angle between the two rolls. The method and measuring scale can be adapted to provide accurate measurement of very small, near parallel orientation angles. The two frames can be adapted to measure the angular orientation of important surfaces such as rolls or odd shapes that are otherwise difficult to measure.