Abstract: A method and apparatus for measuring a gap between two opposing surfaces by utilizing a dial gauge instead of feeler gauges is disclosed. The apparatus includes a mounting block, an extension arm and a dial gauge which may be used to measure any gap distance between about 0.01 mm and about 10 mm. The method is carried out by first zeroing the dial gauge by utilizing a calibration block which has the same thickness as the gap distance to be measured. The novel method and apparatus can be used to replace a conventional feeler gauge method and achieve the benefits of greatly improved precision in measurement, a short measurement time required and completely eliminating human error due to operator dependency.

Abstract: An apparatus and a method for measuring eccentricity between two circular members which are attached together is provided. The apparatus includes a vernier measuring device of a main scale and a vernier scale, and a mounting block having a V-shaped notch in a top surface for receiving a circular member and for mounting the main scale of the vernier measuring device securely to the block. The novel apparatus and method can be used to not only making direct measurement of the eccentricity between the two centers, they may also be used to read directly the number of pulses required for making adjustment to a robot arm when the divisions on the main scale and the vernier scale are specifically designed for such purpose.