Micrometer Calibration and Measurement Techniques

Jim Salsbury from Mitutoyo America Corporation explains the calibration of an outside micrometer, emphasizing the importance of detecting errors and using the ASME B89.1.13 standard. The video covers initial checks, using gauge blocks, and testing flatness and parallelism. It also discusses calibrating larger micrometers and the use of different reference standards.

What is the primary goal of micrometer calibration?

• To find and correct errors in measurement

• To increase the weight of the micrometer

• To enhance the appearance of the micrometer

• To change the color of the micrometer

Why is it important to use a micrometer stand during calibration?

• To make the micrometer look more professional

• To prevent body heat from affecting measurements

• To increase the weight of the micrometer

• To change the color of the micrometer

What is the purpose of using gauge blocks in micrometer calibration?

• To change the color of the micrometer

• To add weight to the micrometer

• To make the micrometer more portable

• To serve as a reference standard for accurate measurements

Why are ceramic blocks preferred for micrometer calibration?

• They are cheaper than steel blocks

• They are more colorful than steel blocks

• They have better thermal properties than steel blocks

• They are heavier than steel blocks

What should be done if a micrometer does not repeat within specification limits?

• Reject the micrometer

• Change the gauge blocks

• Increase the number of readings

• Ignore the results

What is the reported error in micrometer calibration?

• The product of the measured value and the gauge block value

• The sum of the measured value and the gauge block value

• The ratio of the measured value to the gauge block value

• The difference between the measured value and the gauge block value

What is the tolerance for a digital micrometer in inches?

• Plus or minus 50 millionths

• Plus or minus 100 millionths

• Plus or minus 10 millionths

• Plus or minus 5 millionths

What is the alternative method to using an optical parallel for checking flatness and parallelism?

• Using a laser pointer

• Using a larger micrometer

• Using a digital camera

• Using a small sphere or ball gauge

How is the parallelism of larger micrometers tested according to the ASME standard?

• Using a digital camera

• Using a small sphere

• Using the edge of a gauge block

• Using a laser pointer

What is the significance of ringing gauge blocks together during calibration?

• To make them more portable

• To change their color

• To eliminate air gaps affecting readings

• To make them heavier