Machinery's Handbook, 31st Edition
ANVIL MICROMETERS
773
Measuring Range
Barrel
Measuring Faces
0
0 1
20
Anvil
Spindle
Thimble
Graduations
Frame
Fig. 6. Type I, Class 1, Style D: Upright Anvil Tubing Micrometer. Enameled (I-Beam or Hollow Tubular) Frame.
Finish: The finish of the Type I, Class 2 frames shall be a dull, non-reflective chrome plating. The utile measuring face of the anvil and spindle shall have a finish not to exceed 4 m in Ra. The finish of the outer surfaces of the spindle shall not exceed 32 m in Ra. Type I, Class 2, Style A: The Style A Solid Anvil Micrometer is provided in 0–1 inch, 1–2 inch, and 2–3 inch only. The Style A micrometer shall conform to the tolerance limits as defined in Table 8a and Table 8b and in design appear similar to Fig. 7.
Locking Nut or Clamp Ring
Measuring Range Measuring Faces
Ratchet or Friction Stop
Vernier
Anvil
0
0 1
20
Spindle
32NDS. 1.0312 3.0937 5.1625 7.2187 9.2812
Thimble
1-8.125 1-4.250 3-8.375 1-2.500 5-8.625 3-4.750 7-8.875
Graduations
11.3437 13.4062 15.4687
Barrel
Vernier
16THS. 1.0625 3.1875
17.5312 19.5937
21.6562 23.7187
5.3125
Frame
7.4375
25.7812 27.8437
9.56.25
0
11.6875
29.9062
13.8125
31.9678
15.9375
0
1 2 3 4
20
Graduations
Reference Line
Fig. 7. Type I, Class 2, Style A: Solid Anvil, Finished Frame Micrometer
Type I, Class 2, Style B: The Style B Paper Gage (Disk) Micrometer shall be designed with a disk attached to the anvil and spindle of approximately 0.4375 inch diameter. The Style B micrometer is provided in ranges from 0– 1 ⁄ 2 inch, 0–1 inch, and 1–2 inch. The attached disk may be larger or smaller than recommended diameter. All variations in design shall adhere to the tolerance limits defined in Table 8a and Table 8b. The Style B micrometer shall follow in design and appear similar to Fig. 8.
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