7.5 Understanding Optics Squareness
Caution
Optical alignment verification can be performed by any qualified operator. However, optical alignment correction should only be performed by an authorized technician. Report any observed alignment discrepancies and contact the factory or your local Starrett representative to schedule authorized service.
Squareness refers to the alignment of the camera relative to motion of the metrology stage. If the camera is misaligned (out of square), the image will appear to drift diagonally across the video screen as the stage position is moved along one axis. X-axis squareness is adjusted at the factory by rotating the camera with the stage skew to exactly 0° as read on the Vernier scale.
7.5.1 Checking Optics Squareness
To check optics squareness, perform the following steps:
1. Place the magnification (MAG) checker or other suitable inspection part on the stage and secure properly.
2. Select the crosshair image tool in M3 software and verify that it is at its defined center position. Refer to the MetLogix M3 Video and FOV Inspection Software User’s Guide for details.
3. Select a point-like feature such as a corner or the standard ’s X-Y origin. Using the stage, position it to the center of the crosshair.
4. While observing the feature, slowly move the stage X axis only. (Do not move the stage Y axis.) Verify that the point remains aligned on the X axis of the crosshair as the feature is moved to the left and right within the field of view. 5. Report any observed discrepancy. If the error is verified, contact your Starrett representative for authorized service. A temporary fix for X-axis squareness errors is to adjust the skew of the stage.
7.6 Other Performance Factors
Following are some additional factors to consider:
• Keep the optics clean to avoid false shadows and artifacts.
Avoid vibration.
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• Use the calibration and shape correction algorithms available with M3 software, as described in the MetLogix M3 Video and FOV Inspection Software User’s Guide .
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