A vernier scale which is named after Pierre Vernier is defined as a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation. It is used to calculate the internal and external diameters of hollow cylinders. It is also used for the measurement of diameters of round objects with the help of the measuring jaws. It is an extremely precise measuring instrument. It is a device that is used to calculate very accurate linear measurements. In simple words, it measures the straight linear distance between two points. It is a very useful tool to carry in the toolbox.
A vernier caliper is also used to measure the diameter of round and cylindrical objects, by positioning the jaws of the caliper on either side of the circumference.
Vernier caliper is a very useful tool to carry in the toolbox.
The vernier scale measures accurate dimensions. It has two scales; a normal large scale (main scale) and a scale inside it is used to calculate measurements without any error.
The vernier scale gives accurate measurement because it is based on the concept of vernier acuity. The vernier acuity is a type of visual acuity which measures the misalignment of two line segments. The human eye can easily detect aligned and non-aligned lines.
The vernier caliper generally shows either metric or imperial measurements, but some calipers measure in both.
Uses of Vernier Caliper
There are three major uses of Vernier Calipers which are as follows:
It is used to measure the internal diameter of a tube or cylinder.
It is useful in measuring the length of the object.
Traditionally; a vernier caliper is used to measure the diameter of circular objects.
Apart from these Vernier calipers are useful for many purposes such as for the industrial domain as well as for professionals and engineering purposes.
Purposes of Vernier Caliper
Vernier calipers are useful for several purposes, and that's why it has become handy in the industrial domain, for professionals and engineers. This article lists some of the major uses of a vernier caliper below:
Vernier calipers are used in engineering research classes to train school students. It is used to assist intermediate and high school physics students to take measurements of different objects with ‘zero error’.
Vernier calipers are an important device in the steel industry. It is used to measure the inner and outer dimensions of objects that are made up of steel. It is also used to measure the thickness of steel objects of different shapes.
The surgical instruments of the medical sector use vernier calipers because the dimensions of medical instruments need to be measured with utmost precision for medical use.
Scientific Labs use vernier calipers for huge arrays of purposes. For example, to study the effect of thermal variations in different metals that differ in chemical properties. Vernier caliper is also used to precisely measure the objects which are used to join two pieces of two objects thereby employing high skillful precision.
No doubt, the aerospace aviation industry requires extremely high precision. Even a slight change in the dimension of an object can lead to major damage and also to the things related to it. Various types of vernier calipers with high precise readings like digital dial calipers are used to tackle such kind of damage to the system.
How to Use a Vernier Caliper?
A vernier caliper is usually used to measure the diameter of circular objects. The circular jaws of the vernier caliper fit perfectly on the circumference of round objects. Vernier caliper consists of two scales, the main scale which is fixed, and a moving vernier scale. The main scale has readings in millimeters. Unlike standard scales, a vernier caliper can measure readings precisely up to 0.001 cm. For accurate measurement, a vernier scale is used along with a vernier caliper.
Range of Vernier Calipers
The maximum capacity of a vernier caliper is determined by the difference between the largest and the smallest measurement reading. Usually, it is the entire length of the main scale of the vernier caliper. The vernier calipers normally have a range of 300 mm. However, vernier calipers of smaller ranges are also available in the market.
Vernier Reading: The smallest measurable distance that can be captured by a vernier caliper is called a vernier reading. It is also called the "Resolution" of a vernier caliper. The imperial vernier calipers normally have a resolution of 0.001 inches, and the resolution or smallest measurable distance of a metric vernier caliper varies from 0.02 mm to 0.05 mm. The resolution is mentioned at the end of a Vernier scale.
Tolerance: Tolerance or instrument error is the accuracy of the readings of a Vernier caliper. Vernier calipers are normally used to calculate low tolerance measurement readings. Low tolerance measurement readings give reliable and accurate results, as the probability of error is minimum. In general, the tolerance of the Vernier calipers is about +/- 0.03mm (+- 0.0015 in).