ANVIL MICROMETERS Machinery's Handbook, 31st Edition
774
5
0 1
0
1.0312 32NDS. 3.0937
1-8.125 1-4.250
3-8.375
7.2187 5.1625
16 THS. 1.0625
9.2812
3.1875
11.3437
0.8125
13.4062
7.9375
15.4687
Fig. 8. Type I, Class 2, Style B: Paper (Disk) Micrometer Type I, Class 2, Style C: The Solid Ball Anvil Tubing Micrometer is similar in all aspects to the Type I, Class 1, Style C design with the exception that the frame is a solid rectangular construction. Style C shall adhere to the tolerance limits defined in Table 8a and Table 8b. The Style C micrometer shall by design appear similar to Fig. 9.
Measuring Range
Barrel
Anvil
0 20
0 1
Measuring Faces
Spindle
32NDS. 1.0312 3.0937 5.1625 7.2187 9.2812
1-8.125 1-4.250 3-8.375 1-2.500 5-8.625 3-4.750 7-8.875
Thimble
Graduations
11.3437 13.4062 15.4687
16THS. 1.0625 3.1875
17.5312 19.5937
5.3125
21.6562 23.7187
7.4375
9.56.25
25.7812 27.8437
11.6875
Frame
13.8125
29.9062
15.9375
31.9678
Fig. 9. Type I, Class 2, Style C: Solid Ball Anvil Tubing Micrometer Type I, Class 2, Style D, Thread Pitch Micrometer: The Type I, Class 2, Style D pitch micrometer shall appear similar in design to Fig. 10 for fixed pitch micrometers. The Style D interchangeable anvil pitch micrometers vary in that the design incorporates an adjustable anvil with an anvil lock to allow for resetting the zero indication of the micrometer when changing the matched anvil/spindle pitch sets. The interchangeable anvil pitch micrometer shall appear similar to Fig. 11. Both designs adhere to the tolerance limits defined in Table 2 for the frame design and pitch indication accuracy. The micrometer section of the pitch micrometer shall adhere to the tolerance limits of Table 8a and Table 8b for accuracy of the micrometer indication. Design: The design of the Type I, Class 2, Style D pitch micrometer shall be similar to that shown in Fig. 10 or Fig. 11. The frame design, either C-type or rectangular, shall be shaped to permit the measurement of screw thread pitch diameters of Unified thread form threads within size and range of the specific pitch micrometer. The measuring faces of the pitch micrometer consist of a cone (spindle) and a V-groove (anvil) with an inclusive angle the same as the angle of the thread to be measured. The apex of the spindle cone is to be centered and concentric to the axis of the spindle.
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