Machinery's Handbook, 31st Edition
ANVIL MICROMETERS 771 setting standards for the 1.000 inch (25 mm) micrometer shall be either a disk or rod of 1 inch, or 25 mm, respectively. Standards for larger sizes shall be rods. The rods may have either flat and parallel, or spherical ends. The disk, and the ends of the rods, shall have a hardness of no less than 58 RC. The disk shall be concentric in diameter to within 0.00005 inch (0.0012 mm) and shall be within 0.00005 inch (0.0012 mm) of the nominal size. The tolerances for other lengths shall conform to those defined in Table 9. Tolerances and instructions for calibration of reference standards are given in the sec- tion Calibration of Reference Setting Standards starting on page 787. Type I, Class 1, Style A.— Type I, Class 1, Style A, Solid Anvil Micrometers shall follow a design similar to Fig. 3 and conform to tolerances and requirements of Table 8a and Table 8b and be finished in either a smooth or rippled enamel.
Spindle
Adjustable Sleeve
Measuring Faces
Graduated Thimble
Anvil
0 1 2 3 4 5 6
Friction Thimble (optional)
Fiducial Graduation
Ratchet Assembly (optional)
Locking Device Fig. 3. Type I, Class 1, Style A: Solid Anvil Micrometer
Frame
Type I, Class 1, Style B.— Interchangeable Anvil Micrometer shall be in design similar to Fig. 4 and conform to the tolerances and requirements in Table 8a and Table 8b for accuracy. The anvils of the Type I, Class 1, Style B micrometer shall be designed so as to permit a secure and solid seating that allows no side movement and provides accurate alignment with the spindle measuring face. The anvils will provide a means to compensate for wear of the anvil faces and will be provided in the size ranges defined in Table 1.
0 1 0
20
2 – 3 Standard
Fig. 4. Type I, Class 1, Style B, Interchangeable Anvil, Enameled (I-beam or Hollow Tubular) Frame. Provided with reference setting standards. Shown with four 1-inch incremental anvils.
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