To adjust the optical comparator internal edge sensor so that it is exactly in the center of the screen cross lines use the following procedure.
Using only the optical comparator profile light, place an object on the optical comparator stage that will cast a straight image on the screen in a vertical and horizontal direction. A gage block would work fine. The image should cover all or at least half of the screen diameter.
Rotate the screen so the protractor is at zero. This will make the cross lines vertical and horizontal.
“Teach” the edge detector (refer to the optical comparator digital readout manual if necessary) and make sure that the readout beeps when you cross an edge. Note: You might have to move the image far from the center of the screen to test for the beep.
Bring the top of the image to the horizontal cross line. Making sure some of the image is left and right of the vertical cross line.
The adjustment for the optical comparator edge detector is located on the top of the comparator case. There are three button head screws in a triangle pattern approximately in the center on the case. Two screws on one side and one screw on the other. Turning either one of the screws on the side with two screws will move the location of the sensor up and down (only a small amount of adjustment should be needed).
Adjust the up and down until the beep noise flutters. That indicates you are right on the line. Test the location by moving the image up and down. Re-adjust if necessary.
After the horizontal is adjusted align the right side of the image along the vertical cross line. Making sure some of the image is above and below the horizontal line. Adjust the left and right sensor using the single screw until the beep noise flutters. That indicates you are right on the line. Test the location by moving the image left and right. Re-adjust if necessary.
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