Machinery's Handbook, 31st Edition
ANVIL MICROMETERS 775 Table 2. Type I, Class 2, Style D Pitch Micrometer Design Specifications
Tolerance on Half Angle of Measuring Faces ( ± ) Degree Minutes
Error in Indicated Measurement (max.) (in.)
Error in Spindle/Anvil Alignment (max.) (in.)
Number of Threads per inch (1/pitch)
Permissible Flexure (in.)
Size (in.)
Range (in.)
0–0.500 48 to 64
0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001
0 0 0 0 0 0 0 0 0
18
0.00010 0.00020 0.00015 0.00015 0.00015 0.00025 0.00025 0.00020 0.00020
0.00010 0.00020 0.00015 0.00015 0.00015 0.00030 0.00030 0.00015 0.00015
1 ⁄
2
1 1 1 1 2 2 2 2
0–1 0–1 0–1 0–1 1–2 1–2 1–2 1–2
8–13 14–20 22–30 32–40 4.5–7 8–13 14–20 22–30
5 6 8 4 5 6 8
12
Measuring Range Anvil
Locking Nut or Clamp Ring Thimble
Ratchet or Friction Stop
0
0 1
20
Spindle
Barrel Graduations
Frame
Fig. 10. Type I, Class 2, Style D: Thread (Fixed Pitch) Micrometer Anvil: The anvil shall be secured in the frame with it axis aligned and concentric to the axis of the micrometer screw spindle. The anvil shall be well seated and secured but allow for a free turning fit with no shake or lateral movement. The end of the anvil facing the spindle cone shall have a V-groove of the same angle as the thread form to be measured. Both the spindle cone and anvil V-groove shall comply with the parameters set forth in Table 2.
Zero Adjust
Anvil Lock
Fig. 11. Type I, Class 2, Style D: Interchangeable Anvil Thread (Pitch) Micrometer Measuring Surfaces: The conical surface of the screw spindle and the angular surfaces of the V-groove anvil shall conform to the angular requirements defined in Table 2. The inter section of the apex of the conical screw spindle and the V-groove anvil shall be centered, aligned and in the same plane as the axis of the micrometer screw spindle. The surfaces of the conical spindle and the V-groove anvil shall be ground and lapped and hardened to no less than 62 RC. The surface roughness of these surfaces shall not exceed 4 m in Ra.
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