Starrett Vision Metrology System AV450

Squareness refers to the alignment of the camera relative to the motion of the metrology stage. If the camera is misaligned (out of square), an image will appear to drift diagonally across the video image as the stage position is moved along one axis.

Place the MAG checker or other suitable inspection part on the stage and secure properly.

Is the crosshair image tool at its defined center position?

At low mag, 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.

Zoom to high magnification, then refocus and recenter the point as needed.

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.

Does the point remain aligned on the X axis of the crosshair as the feature is moved to the left and right within the field of view?

Report any observed discrepancy.

If the error is verified, contact your Starrett representative for authorized service.

Warning: Avoid touching any lens surfaces during the procedure.

Ring light removed prior to changing the lens?

If an auxiliary lens is in place, was it unscrewed counterclockwise?

Are the new lens and exposed lens of the primary optics assembly clean and dust free?

Was the aux lens carefully screwed in clockwise, finger-tight only?

Was the lens setting updated in the QC5000 software?

Upload a photo of the installed lens.

Sign off on the lens replacement

Warning: Only authorized Starrett technicians should perform this service

Is the system under heavy usage?

If system is under heavy usage, it may require more frequent service

Calibration should be verified periodically depending on user requirements and systems usage, and should be at least monthly.

Calibration should also be verified after the system has been serviced or moved.

The following is a brief description of the steps recommended for the verification of your machine.

Place the calibrated verification standard in one the six positions on the glass stage as shown above. Secure the standard with hot melt glue or other suitable retaining method so that stage translation can not move the standard under any condition.

Skew the center of the two end circles. Please refer to the M3 manual for proper alignment procedures.

Measure the distance between the 1st and 2nd, 1st and 3rd, 1st and 4th, 1st and 5th, and the 1st and 6th fiducials. Repeat these measurements 10 times.

Calculate the absolute average deviation for each of the 5 groups of distance measurements.

Repeat the measurements for all six locations shown in the illustration.

The absolute averages should be within the factory specification, de-rated for the environment and calibration accuracy. See Table 1 - 5, “Travel, Accuracy and Resolution Specifications” for accuracy specifications.

Parcentricity describes the condition wherein a feature will remain at the optical center of the video image throughout the magnification range.

Place the MAG checker or other suitable inspection part on the stage and secure properly.

Select the M3 crosshair image tool and place the crosshair at its defined center position. The crosshair is to remain at this position during the parcentricity test.

Is the crosshair centered on the X-Y axis of the calibration standard at low magnification?

Change to high magnification and refocus the image.

Is the crosshair centered on the feature at high magnification?

While observing the feature, slowly adjust the magnification lower. Verify that the feature remains at the center of the crosshair as the magnification is lowered.

Does the feature remain at the center of the crosshair as the magnification is lowered?

Report any observed discrepancy.