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Windshield Urethane Bead Height/Width Measurement System Disclosure Number: IPCOM000116319D
Publication Date: 2005-Mar-30
Document File: 2 page(s) / 2M

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Windshield Urethane Bead Height/Width Measurement System

The prior audit method for measuring windshield urethane bead height and width utilized calipers. Due to the urethane being wet, the caliper blades cannot touch the urethane. This results in a gage R&R of approximately 120%. The maximum gage R&R allowable is 30%. As a result, the measurements are meaningless and can not be used to make process/tooling mean shifts

     A tripod device was developed which incorporated a camera pointing perpendicular to the bead. The tripod also has a narrow-line generating high intensity laser set at a 45 degree angle to the bead.


The photographic image (which is magnified on the computer screen for more precise measurements) is squared to the urethane bead with the assistance of an overlay horizontal line. Once the image is aligned properly the laser forms an arc on the bead due to its profile. After a screen-capture of the image, the width measurement of the bead is very straightforward by clicking on the edges of the urethane image.

     The height is measured by using the mouse to select the right edge of the linear portion of the laser on either side of the bead and the corresponding edge of the arc at the apex of the bead. Due to trigonometry with a 45-45-90 triangle, this is translated to the height of the bead.  Since the laser is at a 45 angle and the camera is perpendicular to the bead, the camera is actually measuring leg “a” of the triangle created by th...