CALIPERS, VERNIER AND DIAL Machinery's Handbook, 31st Edition
783
Calipers, Vernier and Dial Classification.— The definition of the classifications of vernier calipers was established in the GGG-C-111 standard and provides the basic requirements that were to be met by manufacturers supplying such calipers to the Federal Supply Service, General Services Administration. While the Federal Specifications do not include all varieties of the cal - ipers commercially available, it does provide a guideline for manufacturers. Dial and digital calipers follow the general design features as illustrated in Fig. 17, Fig. 18, and Fig. 20. Any variation in designs must incorporate all aspects and necessary measure ment capabilities as defined in the original government specification.
Centers for Setting Dividers
Gib Carrier
Graduation Bar
Lock Screw
3
2 3 4 5
2 3 4 5 6 7 8 9
2 3 4 5 6 7 8
1
0 5 1015202530
Adjusting Screw
Vernier Plate
Adjusting Nut
Adjusting Jaw
Fig. 17. Original Design: Type 1, Class 1 with Fine Adjust Carrier, Gib, Lock Screw and Fine Adjust Screw and Nut Type and Classes.— Calipers and gages shall be of the following types, classes, and styles, as specified: Type 1 – Calipers, vernier Class 1: Inch measure Class 2: Metric measure Class 3: Inch-metric measure
Internal Jaws
Locking Screw
Imperial Scale
0 5 10152025 0.001 in
2
46812468224683246842468524686 2 3 4 5 6 7 8 9 101112131415
0
1
012345678910
Metric Scale
Depth Measuring Blade
External Jaws
Fig. 18. Type 1, Class 3 – Inch/Metric Dual Scale with Vernier Scale Flush to Edge of Main Scale
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