Method and apparatus for measuring runout in a cylindrical object

摘要: In a method and apparatus for determining runout in cylindrical object, particularly cutting or boring tool such as drill bit reamer, the object is rotated collimated beam of light directed transversely at rotating so to cast shadow on photosensor which produces an electrical signal having current level representative area illuminated. Runout manifested reciprocal variation photosensor, with resulting periodic output photosensor. The amplitude this determined provide measure total indicated object. preferred embodiment, pair photocells positioned behind differential amplifier low-pass electronic filter are employed series separate variable components arising from due profile variations example, flutes twist drill.