Your question: What is the formula of screw gauge?

The formula of least count of screw gauge is as follows: Least count of screw gauge = (Pitch)/(number of divisions) Least count of micrometer screw gauge = (1 mm)/(100) = 0.01 mm.

How do you calculate screw gauge reading?

Total Reading = Pitch Scale Reading + Circular Scale Reading x LC of the gauge. LC in the above equation is the least count of the gauge.

What is value of screw gauge?

A screw gauge of 100 divisions will move the cap scale along the main scale by 1/100 of mm-0.01 mm. This is the minimum value up to which a screw gauge can measure and is known as its least count. Or it is defined as the ratio between the pitch of the screw and the number of divisions on the circular scale.

What is screw gauge class 11?

The screw gauge is an instrument used for measuring accurately the diameter of a thin wire or the thickness of a sheet of metal. It consists of a U-shaped frame fitted with a screwed spindle which is attached to a thimble. Parallel to the axis of the thimble, a scale graduated in mm is engraved.

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What is pitch formula?

PITCH-This is the distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis of the thread. It is represented by the letter p. (p=1/n).

How do you find the thickness of a screw gauge?


  1. Insert the sheet between the studs of the screw gauge and determine the thickness at five different positions.
  2. Find the average thickness and determine the correct thickness by applying the zero error.

How do you calculate error in screw gauge?

Calculating zero error in screw guage

Positive zero-error correction is done by subtracting the positive zero-error from the actual reading. Case (c): Negative zero-error of 4 circular scale division. Negative zero-error correction is done by adding the negative zero-error from the actual reading.

What is PSR in screw gauge?

With the lead shot between between the screw and anvil, if the edge of the cap lies ahead of the Nth division of the linear scale. Then, linear scale reading (P.S.R.) = N. If nth division of circular scale lies over reference line.

What is the other name of screw gauge?

A micrometer, sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers.

How do you calculate the diameter of a screw gauge?


  1. Find the value of one linear scale division (L.S.D).
  2. Determine and record the pitch and least count of the screw gauge.
  3. To find the zero error, bring the plane face B and A near. …
  4. Move face B away from face A. …
  5. Linear scale reading (L.S.R) is recorded by noting down the no. …
  6. Let n be the no.
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Why screw gauge is called micrometer?

Why is screw gauge called a micrometer? Screw gauge is also called a micrometre because it can measure the lengths of the order of 1 micro meter.

What is pitch of screw?

Pitch is the distance between screw grooves and is commonly used with inch sized products and specified as threads per inch. Lead is the linear travel the nut makes per one screw revolution and is how ball screws are typically specified. The pitch and lead are equal with single start screws.