Reading and Setting a 0.001-Inch Micrometer

A micrometer is read by observing the position of the bevel edge of the thimble in reference to the barrel. Observe the greatest 0.100-inch division and the number of 0.025-inch divisions on the barrel scale. To this barrel reading, add the number of the 0.100-inch divisions on the thimble that coincide with the horizontal line (reading line) on the barrel scale.

Procedure to read a 0.100-inch micrometer
• Observe the greatest 0.100-inch division on the barrel scale.
• Observe the number of 0.025-inch divisions on the barrel scale.
• Add the thimble scale reading (.100-inch division) that coincides with the horizontal line on the barrel scale.

Example 1 Read the micrometer setting shown.
Observe the greatest 0.100-inch division on the barrel scale.(three 0.100’’=0.300’’)
Observe the number of 0.025-inch divisions between the 0.300-inch mark and the thimble.( two 0.025’’=0.050)
Add the thimble scale reading that coincides with the horizontal line on the barrel scale.(eight 0.001’’=0.008’’)
Micrometer reading:0.300’’+0.050+0.008’’=0.358’’ Ans

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