Physics

Difference between Vernier Caliper and Micrometer Screw Gauge

Both the vernier caliper and the screw micrometer caliper are the measuring equipment used for multiple purposes. The difference lies in its efficiency and use. Actually, they are the superior measuring equipment to the commonly used meter ruler as they can measure small distances even 1mm which is the last count of the meter ruler. When it comes to the Difference between Vernier Caliper and Micrometer Screw Gauge based on their structures, one can easily distinguish between them and that Vernier caliber is pistol-like equipment while micrometer is ax-like equipment.

The vernier caliper, which consists of two scales, the main scale, and the vernier scale, has a minimum count of 0.1 mm, while the screw micrometer gauge in which the measurements of the object are taken by placing it between the shaft and the anvil, has the last count of 0.01 mm.

Vernier Calipers (Vernier Calipers) and Micrometers ( Micrometer Screw Gauges) are used to measure distances too small to be measured using a gauge ruler with a minimum of 1mm.

The main difference between the vernier caliper and the micrometer is that the vernier caliper uses two sliding scales with different spacings between the marks on each scale while a micrometer uses a screw to translate small distances moved by its jaws to greater distances. along the marked scale.

Key Differences

  • The vernier caliper is pistol-like equipment, while the micrometer is ax-like equipment.
  • The Vernier caliper with a special type of jaws can take both internal and external measurements with precision, while the screw caliper is used to take external measurements as it lacks the proper structure to take the internal measurements of the object.
  • The vernier caliper, which consists of two scales, the main scale and the vernier scale, has a minimum count of 0.1 mm, while the screw micrometer caliper in which measurements of the object are taken by placing it between the axis and the anvil, has the last count of 0.01 mm.

Overview – Vernier Caliper and Micrometer Screw Gauge

It is important to remember that both micrometers and vernier calipers can provide zero errors. Before measuring an object, it is always good practice to bring the two jaws together and see if the instrument gives a reading of 0. If this is not the case, the reading should be noted and added/subtracted from the measurement of the object.

Working Principle of Vernier Caliper and Micrometer

Vernier calipers Use a sliding vernier scale to measure small movements of your jaws.

Micrometers use a screw to amplify small movements of your jaws to larger movements of the rotary scale.

Possible measurements

Vernier calipers generally allow a user to measure ODs, IDs, and depths.

Micrometers  Users are generally only allowed to measure outside diameters. There are other more specialized types of micrometers available for measuring internal diameters and depths.

Precision

Vernier Calipers  Traditionally have a precision of 0.1 or 0.05 mm. Digital vernier calipers are accurate to 0.01mm.

Micrometers Typically have an accuracy of 0.01mm.

Difference between Vernier Caliper and Micrometer Screw Gauge in Tabular Form

Vernier CaliperMicrometer Screw Gauge
StructureThe Vernier caliper is a pistol-like instrument.The micrometer is an ax-like instrument.
Specific functionsVernier calipers with a special type of jaws can take both internal and external measurements with precision.The screw gauge is used to take external measurements as it lacks the proper structure to take internal measurements of the object.
Least count0.1 mm0.01 mm.

What is Vernier Caliper?

Vernier Caliper is a measuring instrument, consisting of main scale and vernier scale, it has a minimum count of 0.1mm. It has a gun-like structure and is used to measure the internal and external dimensions of objects very precisely. It is mostly preferred over other measuring instruments as it has a special type of designed jaws that can hold the object in or out and the reed takes the exact measurement of the object.

Before taking the measurement with the vernier caliper, the zero of the vernier scale and the zero of the main scale must be exactly opposite each other. If the zeros of both scales are not placed properly before reading, it can lead to zero error in measurement.

Zero error can be of two types, positive zero error and negative zero error, if the vernier scale is to the left of the main scale then it is the negative zero error and when the vernier sell is to the right side of the main scale then it is the positive zero error.

Zero error can be eliminated by adding or subtracting the differences from the actual measurement.

how to read a vernier caliper?

To measure an object, the object is held between the jaws, and the vernier scale is moved. By observing which mark on the vernier scale aligns with a mark on the main scale, the distance between the jaws could be read with greater precision than the minimum count on the main scale.

Typically, vernier calipers can measure lengths with an accuracy of 0.1 or 0.05 mm. Most vernier calipers are equipped with a smaller jaw set for measuring internal diameters and a depth probe for measuring depths.

Digital vernier calipers come with a small screen that shows the value directly, and its precision could be as high as 0.01mm.

The diagram below shows a standard analog set of vernier calipers. Specifically, write down the numbered parts (1) outer jaws, (2) inner jaws, (3) depth probe, (4) main scale, and (6) vernier scale.

Diagram will be Provided soon

What is the micrometer screw gauge?

The micrometer known as a micrometer screw gauge is an instrument that is generally used to measure the external measure or the diameter of an object. It is an ax-like device that has the smallest count of 0.01 mm.

As the word screw meter hints at its mechanism, the object to be measured is placed between the shaft and the anvil and then the measurement is taken. The vernier caliper is sometimes preferred as it can take the minimum measurement of 0.01mm, while the vernier caliper can measure at least 0.1mm.

Although, the most common types of micrometer screw calipers lack the proper structure to take internal measurements of the object.

In a micrometer, the object to be measured is placed between the jaws, and the thimble is rotated until the jaws move together and close the object. A screw attached to the thimble rotates along with it and allows precise distance values ​​to be read from the scale. The video posted below explains how to read a micrometer.

How to read micrometer screw gauge?

A typical micrometer has an accuracy of 0.01mm. To measure inside diameters and depths, different types of micrometers are used.

The diagram below shows, from bottom to top, an outside micrometer, an inside micrometer, and a depth micrometer (note that these particular micrometers have been calibrated for the imperial system).

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