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Thread Micrometer and measurement method of thread micrometer

Thread Micrometer:

  • Thread micrometer is used to measure the pitch diameter of the screw thread and it shows the variation in the drunken thread.
  • It is equal to the ordinary micrometer, it is provided with the contact point.
  • It has two ends one is connected with a spindle, and another end has a fixed anvil with the corresponding recess.
  • The spindle is in v-shape.
  • Both the spindle and anvil are fitted between the two thread flanks.

Method of Measurement:

  • Before using the thread micrometer, the zero error want to measure.
  • With the contact of spindle and anvil, the zero error is measured.
  • After measuring the screw is placed between the spindle and the anvil, such that the angle of point and thread flanks are in contact with the screw thread.
  • By this readings can obtain from micrometer.
  • The effective diameter of the screw thread is obtained by measuring both side of major Dia and minor diameter.
  • The value obtained must be equal to the value obtained from the relation. Pitch Dia or Effective Dia = --0.6403p
  • Where p - pitch and
  • Outer diameter.
  • The major drawback is that shows errors due to hexyl angle when it does not set to a standard gauge, while the start of measurement.
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