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5. What is a screw thread micrometer? How to check screw thread micrometer accuracy?

# What is a screw thread micrometer? How to check screw thread micrometer accuracy?

This is a micrometer, by which the effective diameter of the thread is measured. It is similar to the outside micrometer. (Screw thread Micrometer kya hai in hindi)

### What is a screw thread micrometer?

“The micrometer by which the effective diameter of the thread is measured is called Screw thread Micrometer They say.”

### Structure of Screw Thread Micrometer

its texture Ordinary or outside is similar to micrometer. The only difference is that the spindle ends are cone-shaped instead of flat. And the end of its anvil is ‘V’ shape instead of flat. This shape is made so that both the bangles can sit deeply. A hole is made in its anvil, so that the anvil can be changed as per the requirement.

### Angle present on anvil and spindle

The anvil of this micrometer can be both fixed and moveable. Whose ‘V’ groove angle is 55° or 60°. And the angle of the cone shape of the spindle is also 55° or 60°.

### How to check screw thread micrometer accuracy.

Friends, if you are doing practical of screw thread micrometer or are using screw thread micrometer, then first of all check zero error. To check for zero error, first turn off the micrometer completely. So that the anvil and spindle of the micrometer touch each other. Then watch this. Whether the zero of the thimble of the micrometer is meeting the datum line of the sleeve. And if the zero of the thimble is meeting the datum line of the sleeve, then there is no zero error in the micrometer.
If the zero of the thimble is ahead or behind the datum line of the sleeve, there is a zero error. Correct this zero error by rotating the sleeve with the help of ‘C’ spanner or with the help of screw on the rear of the anvil. After that use. This will give accurate readings from the micrometer.

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