TUBULAR INSIDE MICROMETERs Machinery's Handbook, 31st Edition
779
Table 5. Type II, Class 3, Style A, Range and Tolerance Inch
Tolerance
Range of Micrometer Head (inch)
Range (inch) 1 to 8 1 to 12 4 to 24 4 to 32 4 to 40 1 to 32
Micrometer Head (inch)
Length Rods (inch)
0 to 0.500 0 to 0.500 0 to 1.000 0 to 1.000 0 to 1.000
0.0002 0.0002 0.0002 0.0002 0.0002 0.0002
0.0005 0.0005 0.0007 0.009 0.001 0.0015
(two heads) 0 to 0.500 / 0 to 1.000
Metric
Tolerance
Range of Micrometer Head (mm)
Range (mm)
Micrometer Head (mm)
Length Rods (mm)
40 to 200 40 to 300 100 to 600 100 to 800 100 to 1000
0 to 13 0 to 13 0 to 25 0 to 25 0 to 25
0.005 0.005 0.005 0.005 0.005 0.005
0.012 0.012 0.018 0.022 0.022 0.025
(two heads) 0 to 13 / 0 to 25
40 to 800
Measuring (Length) Rods: A sufficient number of length rods of hollow steel tubular construction shall be provided to enable measurement of any dimension within the range of the inside micrometer set. The length rods shall be so designed that they may be mounted on either or both ends of the micrometer head. A cap head measuring face shall be provided to mount to either or both ends of the micrometer head in the case where no length rod is being used. Each rod is to be adjustable by means of a hardened and ground plug at one end that can be turned either into or out of the length rod. Type II, Class 3, Style B.— The Type II, Class 3, Style B, Tubular Inside Micrometer, Fixed Head shall be of hollow steel tubular construction with a micrometer head perma nently attached. Each unit will be equipped with a thermal isolation grip to negate the effects of thermal expansion from the heat of the hand. The Style B shall follow in design and appear similar to Fig. 15 . Accuracy and length requirements are defined in Table 6.
5
0 2
1 2
4 4 –
0
Fig. 15. Type II, Class 3, Style B: Inside Tubular Fixed Micrometer Head Type II, Micrometer Head, Adjustments, Measuring Faces: The Type II, Class 2, Style B inside micrometer uses a micrometer head that adheres in design and function to the fea tures defined in the Type I, Caliper Micrometer section. The measuring faces shall have a spherical radius not to exceed 1 ⁄ 2 the radius of the smallest measuring range but otherwise adhere to the parameters defined in that section. The adjustment shall be as defined in the Type I, Caliper Micrometer section.
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