Machinery's Handbook, 31st Edition
772 ANVIL MICROMETERS Table 1. Standard Sizes, Type I Class 1 Style B, Interchangeable Anvil Micrometers Size Range, Inch Size Range, mm 0–4 12–18 0–100 300–450 2–6 16–20 50–150 400–500 6–9 18–24 150–225 450–600 6–12 20–24 150–300 500–600 9–12 24–96 (in 6 inch increments) 225–300 600–2400 (in 150 mm increments) 12–16 300–400 Type I, Class 1, Style C.— Tubing Ball Anvil Micrometer shall appear similar in design to Fig. 5.
Ratchet or Friction Stop
Measuring Range
Barrel
Anvil
0
0 1
20
Measuring Faces
Spindle
Thimble
Graduations
Frame
Fig. 5. Type I, Class 1, Style C: Tubing Ball Anvil, Enameled (I-Beam or Hollow Tubular) Frame, Fixed Ball Anvil Size and Range: The Style C Tubing Ball Anvil Micrometer is generally provided in the 1 ⁄ 2 inch or 1 inch (13 mm or 25 mm) range. The range and accuracy of the micrometer is defined in Table 8a and Table 8b. The 1 ⁄ 2 inch (13 mm) size micrometer shall conform to the tolerance limits expressed for the 0–1 inch micrometer. Anvil: The measuring face of the anvil shall be a bisected sphere permanently affixed to the frame with the radial center aligned to the projected axis of the spindle. The anvil shall be of such a radius as to permit accurate measurements of the wall thickness of tubing having a minimum inside diameters of 0.3125 inch for the 0 to 1 ⁄ 2 inch range. The radius of the anvil for the 0 to 1 inch micrometer shall permit accurate measurement of minimum inside wall thickness diameters of 0.375 inch. For the metric calibrated micrometer, the anvil radius shall be adequate to accurately measure a minimum internal wall diameter of 8 mm for the 13 mm micrometer, and a minimum internal wall diameter of 10 mm for the 25 mm range micrometers. Type I, Class 1, Style D.— The Style D, Tubing Upright Anvil Micrometer , shall have the half-C type frame, of I-Beam construction, with the diametrical axis of the anvil perpen dicular to the axis of the spindle and in the same plane. The Style D micrometer shall follow in design the example in Fig. 6. Micrometer is provided in 1 inch or 25 mm range. Spindle and Anvil: The measuring face of the spindle will be no less than 0.2343-inch diameter and be flat and parallel to the axis of the anvil. The spindle face shall be perpen dicular to the axis of the anvil throughout the rotation and travel of the spindle. The diame ter of the anvil shall permit the anvil to freely enter a 0.375-inch diameter hole to a depth of 0.750 inch. Type I, Class 2, Finished Frame.— The Class 2 Fixed Anvil, Finished Frame Microme ter shall have a long taper back , cutaway , or C-type frame (see Fig. 2a, Fig. 2b, and Fig. 2c) of a solid rectangular construction. The sides of the frame shall be stamped, engraved or permanently marked in a practicable location in the decimal equivalent of common fractions; 8ths, 16ths, 32nds, 64ths. Stamping, engraving or etching shall be sufficiently deep enough to make characters readily legible in normal operating conditions.
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