Browse Prior Art Database

Contour Measuring Device

IP.com Disclosure Number: IPCOM000075800D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Hauke, FE: AUTHOR [+2]

Abstract

During the manufacture of a part, or during the acceptance inspection of a completed part, it is sometimes necessary to determine whether the part conforms to predetermined lower and upper tolerances. Simultaneous optical scanning of the part and standard tolerance blocks representing upper and lower tolerance limits provides an easily determined display pattern, indicating whether the part dimensions fall within the specified tolerance range.

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Contour Measuring Device

During the manufacture of a part, or during the acceptance inspection of a completed part, it is sometimes necessary to determine whether the part conforms to predetermined lower and upper tolerances. Simultaneous optical scanning of the part and standard tolerance blocks representing upper and lower tolerance limits provides an easily determined display pattern, indicating whether the part dimensions fall within the specified tolerance range.

A source provides a slit of light which is applied across the part and two limit blocks. One limit block has the dimensions of the lower tolerance for the part and the other has the dimensions of the upper tolerance specifications for the part. The light beam may be focused by a cylindrical lens, slit, or other suitable optical mechanism with the part and limit blocks acting as mirror elements to form a narrow line on a screen. Since the curvatures of the upper and lower tolerances are different, the reflected light will cause two limit lines to appear upon the screen. A third line, representing the part, will appear between these two lines if the part is within the desired limits. When the light beam is scanned across the surface of the part and tolerance limit blocks by moving either the beam or a fixture holding the part and blocks, the relative positions of the three lines will change as a function of the block curvatures. The distance between the reflected lines may be calibrated to indicate th...