Non-contacting laser gauge for qualifying screw fasteners and th

Details Non-contacting laser gauge for qualifying screw fasteners and th Non-contacting laser gauge for qualifying screw fasteners and th

1995-12-11

2000-08-29

Britton, Howard W.

Television

Special applications

Manufacturing

348 86, 348128, 348131, 348137, H04N 718

Patent

active

061116017

ABSTRACT:
A non-contact gaging method and apparatus using a directional light beam develops a silhouette image on a CCD camera detector array; the image spanning opposite edges of an object to be gauged. The three dimensional object is imaged on the two dimensional camera array and, by means of computer analysis of pixels output from the camera, precise measurements to MIL Standards of physical dimensions are made at high rates for high volume production.
Errors inherent in Prior Art devices are eliminated by only using a point source of light and eliminating the need for any additional optics. The system overcomes dimensional error by continuously gauging the high precision etched mark on the camera faceplate.
Errors introduced by translating a three dimensional object's image into two dimensions are compensated in the computer software and, in essence, the two-dimensional image as captured by the camera is transformed via computer to a three-dimensional image that can be used to accurately gauge to determine parameters of a machined article such as a threaded fastener's pitch diameter, thread pitch, major and minor diameter, flank angle, and length of thread engagement.

REFERENCES:
patent: 3941484 (1976-03-01), Dreyfus
patent: 4576482 (1986-03-01), Pryor
patent: 4644394 (1987-02-01), Reeves
patent: 4777360 (1988-10-01), Carner
patent: 4823396 (1989-04-01), Thompson
patent: 4828159 (1989-05-01), Woods
patent: 5114230 (1992-05-01), Pryor
patent: 5150623 (1992-09-01), Woods
patent: 5327217 (1994-07-01), Kanai

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