Machinery's Handbook, 31st Edition
748 V-BLOCK CALIBRATION 4) Without disturbing the position of the cylindrical gage mounted in the V-groove, rotate the setup over and lay the UUT on Side B. 5) Place the contact point on top of the cylindrical gage as close as possible to the same distance from the end of the V-block as in Item 3). Seek the top of the cylinder by sweeping across the radius and observing the maximum indication. This reading must be within the tolerance limits defined in Table 11.
Indication over Crest of Precision Cylindrical Gage
Surface Plate
Fig. 15. V-Block Indicate Side A 6) Rotate the cylindrical gage 180° and repeat Items 2) through 5). This reading must be within the tolerance limits defined in Table 11. 7) Repeat the process for the opposite end, and for each remaining V-groove on the UUT. 8) If the UUT is a matched set, the maximum deviation must not exceed the limits for matched sets as defined in Table 11. Flatness of Working Surfaces.— 1) Place UUT onto sine plate as shown in Fig. 16 and seat well against the end bar. Assure that no nicks or burrs are present on either the plate 3) Place the contact point of the electronic indicator into the V-groove at the upper left position of the first line as shown in the Top View of Surface of Fig. 16 and zero the electronic indicator at this position. or end bar that could affect the reading. 2) Set up the Sine Plate to an angle of 45°
Top View of Surface
Surface Flat and Parallel
Meter
Gage Block Stack to Sine of °45
Electronic Height Gage
Sine Plate
Surface Plate
Fig. 16. Flatness of Working Surface Set Up 4) Sweep the surface along the lines shown from the throat of the V-groove to the outer edge Left to Right (or End A to End B) 5) Verify that all readings are within the tolerance limits as defined in Table 11. 6) Rotate the V-block so the side opposite is now parallel to the surface plate and repeat Items 3) through 5), working from End B to End A. 7) Record all readings on a permanent record and retain for use by the QA system. 8) Remove all standards. Clean and return to protected storage condition. Remove UUT from set up and store in appropriate protective containers or stations.
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