Work-master comparison gaging method and instrument

摘要

A work part is compared to a master part, to measure the deviation, if any, between the parts, using a comparison gaging instrument having a master gaging probe with a fixed master engaging tip and a work gaging probe with an axially floating work engaging tip. The parts are compared by placing them side by side on a supporting surface, effecting relative movement of the parts and probes parallel to the supporting surface with the master and work probe tips in contact with the master and work parts, respectively, in a manner such that the relative movement of the probes with respect to the parts occurs in unison along the surfaces of the parts and the master probe and work probe tip are positioned axially by their respective surfaces, maintaining a fixed positional relationship between the master probe and work probe body in their axial direction during such relative movement, and producing an electrical signal proportional to the axial displacement of the work probe tip from a given datum postion relative to the work probe body and representing the deviation of the work part from the master part at any given points of contact of the probes with the parts.