Machinery's Handbook, 31st Edition
806 CALIBRATION OF VERNIER, DIAL AND DIGITAL CALIPERS each calibration section and record all data as “As Found” prior to any further action. Upon completion of procedure, report any out of tolerance conditions that may have been discovered. Any out of tolerance conditions must be addressed before returning the UUT to service. Calibration of Step Height.— 1) Close the caliper jaws completely and set zero on the dial or display. 2) Place the caliper head downward on the surface plate as shown in Fig. 32.
1.000
Surface Plate
Fig. 32. Step Height Measurement with Gage Block in Position behind Main Beam Engaging Step Height Measurement Surface 3) Open the caliper jaws to accommodate the measurement of a 1.000 inch gage block by the Step Height measuring surface on the back side of the moveable jaw. 4) Bring the Step Height measuring surface into contact with the surface of the gage block. Assure the back of the main beam is in direct contact with the outside of the gage block to establish a good perpendicular condition. 5) Apply gently downward pressure with the thumb wheel. 6) Repeat the measurement several times to confirm repeatability before accepting the measurement. 7) Record the measurement. There is no adjustment for this feature. 8) If the Step Height is determined to be within tolerance, remove and store all standards in their appropriate containers and apply any corrosion protection methods as required. If the step height is found Out of Tolerance, record all data as “As Found” prior to any further action. Upon completion of procedure, report any out of tolerance conditions that may have been discovered. Any out of tolerance conditions must be addressed before returning the UUT to service.
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