Measuring device for positional deviation of surface of bore - employs rotary tool supported by nut on external thread at end of shaft remote from surface under examination

摘要

The surface (2) under examination is meant to be concentric with the central axis of a threaded bore (3). A lever arrangement (42) is used with an adaptor (40) to probe the surface by means of a hard metallic ball (46) while a sinking tool (4) is rotated. The tool is guided by a central bore (17) and rotated about a threaded shaft (5) with a nut (8) supporting the tool on an external thread (18). Movements of the lever (43) are transmitted conventionally to a pointer on a scale. ADVANTAGE - Accurate measurements can be made easily by any operator having average technical ability.