How Do You Read A Metric Micrometer?

When measuring things like the inside radius of a tube or the diameter of a sphere, a micrometer will give you a very accurate result. The most common type of micrometer, the screw gauge, has precisely machined threads in the handle that are used to advance and retract a shaft, or spindle. When the spindle is advanced, the number of turns or partial turns on the threads is measured using a gauge stamped into the handle.

This gauge can be in either English or metric units. Set the micrometer on the object to be measured. For inside micrometers, this means it is stretched across the inner diameter of the tube or pipe, and for a depth micrometer, it means it is resting on the rim of the bowl or channel and the spindle is resting on the bottom.

For an outside micrometer, the object being measured should be lightly held between the spindle and the anvil. Use the micrometer's locking mechanism to hold the shaft in place. This will most likely be a thumb lever or thumb wheel located near ... more.

Accurately measuring the depth of a bore or channel is something that any engineer, mechanic or kitcar enthusiast needs to be able to do with a high degree of accuracy. A depth micrometer is the ideal tool for the precise measurement needed. Learning how to read a depth micrometer is easy.

By understanding how to operate your depth micrometer you will be able to quickly set and read the gauge. Measure the spindle for your depth micrometer. Your micrometer may have come with a set of spindle, select one and measure (in mm) the length of the spindle from the end to the beginning of the shank.

The shank is where the spindle widens. Insert the spindle shank into the bottom of the depth micrometer. The bottom of the micrometer is where the "scale" piece is attached, the scale extends out from the body of the micrometer looks like a handle on a sword.

The spindle will fit into a small hole beneath the scale that has a locking knob extending from beneath the scale, turn the knob until you ... more.

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