V-BLOCK CALIBRATION Machinery's Handbook, 31st Edition
743
Calibration of V-Blocks Calibration Description.— Calibration of the V-block shall be accomplished at in- tervals determined by either National Conference of Standards Laboratories (NCSL) Recommended Practices found in RP-1 “Establishment and Adjustment of Calibration Intervals” or the responsible facilities Quality Assurance Manual. Calibration intervals are designed to provide an acceptable level of assurance to adherence to original manu- facturer’s specifications. Calibration of all precision measurement equipment is critical to providing measurement assurance to the quality system and maintaining a sound, ro- bust manufacturing process and quality system. Table 11. Tolerance Limits per Grade Test Instrument (TI) Characteristics Range Performance Specification for Accuracy Test Method Ends/sides Squareness To Each Other Up to 5 in. Grade A – 200 µ in Grade B – 0.002 in.
Grade A – 500 µ in Grade B – 0.002 in. Grade A – 300 µ in Grade B – 0.002 in. Grade A – 500 µ in Grade B – 0.002 in. Grade A – 300 µ in Grade B – 0.002 in. Grade A – 500 µ in Grade B – 0.002 in. Grade A – 100 µ in Grade B – 500 µ in Grade A – 200 µ in Grade A – 300 µ in Grade B – 500 µ in
Over 5 in.
Up to 5 in.
Parallelism of V to Base
Over 5 in.
Verified with Electronic Indicator
Up to 5 in.
V Centrality
Over 5 in.
Flatness of Working Faces
Less than 6.00 in.
Matching Tolerance
Over 6.00 in.
Note: Tolerances listed in Table 11 are a representation of the standard tolerances recommended by the GGG-V-191D -1971, AFMETCAL (Air Force Metrology & Calibration Program) and gen eral commercial manufacturing. Be advised that not all features are calibrated on all types and styles of V-blocks. Manufacturer’s tolerances shall be applied when provided. The actual use of the V-block should be taken into consideration when selecting the features to be calibrated. Table 12. Equipment Requirements Item Minimum Use Specifications Calibration Equipment Examples Surface Plate Range: 24 × 36 inch, Grade AA, 100 µ in overall Flatness Per Fed Spec GGG-P-463 Electronic Indicator Range: ±0.010, Accuracy: ±0.00001 in. Mahr-Federal, Model 832 Digital Electronic Amplifier w/ EHE-2056 LVDT
Range: 0.5 in. dia. × 3 in L; Accuracy: Class XX Range: 1.00 in dia. × 2 in. L; Accuracy: Class XX Range: 9 in. L × 12 in. H × 3 in. W Accuracy: Grade AA 25 µ in/6 in. Range: 0.375 in. to 5.00 in
Van Keuren, Extra Length Reversible Plug Gage
Precision Cylindrical Gage
Van Keuren, Reversible Plug Gage
L.S.Starrett Granite Tri-Square
Granite Master Square
Squarol
Squarol Squareness Checker Model #700
Range: 6 × 6 inch; Accuracy: ±200 µ in
Sine Plate
Taft Pierce Model 9123-1
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