Vernier caliper | How to use , Parts , Application – Vernier Caliper Reading Measurement 

Vernier caliper – Precision linear Measuring Instrument 

A vernier caliper is a measuring device used to precisely measure linear dimensions.

It is a very useful tool to use when measuring the diameter of  a round objects like cylinders because the measuring jaws can be secured on either side of the circumference.

The Vernier Caliper is a precision instrument that can be used to measure internal and external distances extremely accurately. The example shown here is a manual caliper.

Vernier caliper can be used for three types of measurements, outside distance (such as the length of an object) ,2nd one is inside distance such as the width of a groove or the diameter of a large hole, 3rd one is depth, such as the depth of a hole or the height of a step.

Read also : Vernier Height Gauge | Construction | Advantages and Disadvantages

Vernier Caliper Parts :

Vernier caliper upper jaws

The upper jaws of a caliper are used for taking inside measurements such as the diameter of a hole or slot.

Vernier caliper lower jaws

The lower jaws are used for measuring outside dimensions such as width, length and diameter.

Vernier caliper depth rod

The depth rod is used for measuring the depth of holes. It protrudes when the thumb screw is turned.

Vernier caliper main scale

The main scale runs along the beam of the caliper. On a metric vernier caliper, the main scale is graduated in centimetres (cm) and millimetres (mm). On an imperial vernier caliper, the main scale is graduated in inches, with each inch divided into increments of a tenth of an inch (0.1 inch).

Vernier scale

The vernier scale adds an extra degree of accuracy to measurements. On the vernier scale, the smallest increment on the main scale is further divided. The metric vernier scale is divided into 50 equal parts. The measuring range of the vernier scale is usually 1mm, with each increment representing 0.02mm. On an imperial caliper with a main scale of 6 inches, the vernier scale is 0.6 inch long, and is divided into 25 parts. Each increment has a length of 0.001 inch.

Vernier caliper thumb screw

The thumb screw is used to precisely adjust the measuring faces of the caliper (both sets of jaws and the depth rod). It helps the user to get a tight grip on the material they are measuring.

Vernier caliper lock screw

The lock screw secures the jaws into place, so the object you are measuring can be removed, and readings taken.

vernier caliper how to use ,parts , least count
vernier caliper how to use ,parts , least count

Vernier scale and Main scale :

A vernier scale has a main scale and a vernier scale. The main scale has the normal resolution with a 1 division value is 1 mm. The vernier scale is attached to the main scale which can slide on it and has 50 divisions on it.

The VERNIER is a small movable graduated scale for obtaining fractional parts of subdivisions on a fixed main scale of any measuring instrument.Usually vernier calipers have both imperial (inches) and metric (mm) scales.

Other parts of vernier calipers are external jaws – this jaws are used for measuring external dimensions .job is placed in between this two jaws. internal jaws are used for internal dimensions measurement like washer id , grove ,slot ,cutout pocket dimension, stem is used for depth measurement or height measurement. lock screw is used for locking vernier scale moving body.

Principle of Vernier Caliper 

The vernier scale works on the principle of using alignment of line segments displaced by a small amount to make fine measurements. Human eye can easily detect this alignment of lines which is the main fact that drives a vernier.

Least Count Of Vernier Caliper :

Least count is nothing but smallest possible value that can be measured using instrument. this can be calculated by smallest division value on main scale in mm divided by total number of division on main scale .here in this case 1 mm is one division value divided by 50 numbers which is total count of vernier scale line = 0.02 mm . so least count is 0.02 mm

Vernier Caliper How to Use 


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