V-BLOCK CALIBRATION Machinery's Handbook, 31st Edition
746
Indication over Crest of Precision Cylindrical Gage
Surface Plate
Fig. 13. V-Block with Cylindrical Gage Installed 2) Place the contact point on top of the cylindrical gage as close as possible and directly above the end of the V-block. Seek the top of the cylinder by sweeping across the radius and observing the maximum indication. 3) Zero the electronic indicator at the high point of the sweep. 4) Move the gage head to the end of the cylindrical gage. Indicate the peak of the radius and note the reading. 5) Rotate the cylindrical gage or square 180° and repeat Items 2) through 4). 6) Do not adjust the zero setting of the electronic indicator from Item 5). Note: If the cylindrical gage or cylindrical square being used covers 3 ⁄ 4 of the V-groove then Gage or Square does not have to be moved to the other end. 7) Remove the cylindrical gage or cylindrical square being used and place it on the oppo site end of the V-groove with the same end facing out. 8) Place the contact point on top of the cylindrical gage as close as possible and directly above the end of the V-block. Seek the top of the Cylinder by sweeping across the radius and observing the maximum indication. Note this reading. 9) Move the gage head to the end of the cylindrical gage. Indicate the peak of the radius and note the reading. 10) Rotate the cylindrical gage or square 180° and repeat Items 8) through 9) retaining the original zero setting position. 11) Record the largest reading found as the maximum error of Parallelism of V to Base. Reading shall fall within the Tolerance Limits defined in Table 11. 12) Lay UUT on Side A and perform Items 1) through 11) to calibrate Parallelism of V-Groove to Side A. 13) Lay UUT on Side B and perform Items 1) through 11) to calibrate Parallelism of V-Groove to Side B. 14) Repeat Items 1) through 13) for V-groove opposite and all remaining V-grooves if unit is Type 2, Style 1; Type 3, Style 1 or 2; or Type 4, Style 1. a) Double V-Groove Block Tolerance is to be derived from the tolerance of the larger of the two V-grooves. b) The Type III Style 2 Quadruple V-Block is generally produced in the B Grade and the applicable tolerance shall be applied to all V-grooves inclusive. Grade A tolerances shall apply to all V-grooves in a Grade A Quadruple Type III Style 2 regardless of the size of the V-groove unless otherwise specified by the manufacturer. 15) If V-blocks are a matched pair the maximum deviation between the members may not exceed the tolerance limits as defined in Table 11. 16) All dimensions must be indicated in matched sets. 17) Place both members of the set side by side on the surface plate with the V-groove up as shown in Fig. 14. The clamp or yoke is not installed for this measurement. 18) Place the contact point at the upper left corner of V-Block 1 and zero the indicator at that point.
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