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. ...
What are the two jaws of a vernier caliper used for?
There are two jaws on vernier caliper upper jaw and lower jaw. These jaws together are used to hold the object firmly while measuring its length which is not possible with a metre scale. The external or lower jaws which are generally used to measure the diameter of a sphere or a cylinder.
What is the function of the lower jaws of a caliper?
The lower jaws allow the vernier caliper to measure outer dimensions of objects such as the length, width or diameter. The upper jaws are smaller in size and are attached to the upper portion of the vernier caliper. Similar to the lower jaws, one of these jaws is fixed and the other is movable.
Can a vernier height gauge be used as a caliper?
This type of vernier height gauges can be used as an ordinary vernier caliper by separating its base. While using both types of vernier height gauges, it is necessary to keep in mind the following points:
What is a Vernier caliper thumb screw?
Vernier caliper thumb screw. The thumbscrew 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. 7. Vernier caliper lock screw.
What is the 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 1 mm, with each increment representing 0.02 mm. On an imperial caliper with a main scale of 6 inches, the vernier scale is 0.6 inches long and is divided into 25 parts. Each increment has a length of 0.001 inch.
What are the upper jaws of a Vernier caliper used for?
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. 2. Vernier caliper lower jaws. The lower jaws are used for measuring outside dimensions such as width, length, and diameter. 3.
Why is the Vernier caliper tilted?
Vernier caliper is tilted during use especially when measuring depth. Dirty measuring surfaces. The improper conditions of the jaws of the caliper, like natural wear and warping, so the caliper jaws must be tested frequently by setting the 0.0 point of the main and vernier scales.
What is the accuracy of a Vernier caliper?
IS:3651 recommends three types of vernier calipers A, B and C to meet the various needs of internal and external measurements upto 2000 mm with a vernier accuracy of 0.02, 0.05 and 0.1 mm and the recommended measuring ranges are 0-125, 0-200, 0-250, 0-300, 0-500,#N#0-750, 0-1000, 750-1500 and 750-2000 mm.
How does the Vernier scale work?
The vernier scale works on the principle of using the alignment of line segments displaced by a small amount to make fine measurements. The human eye can easily detect this alignment of lines which is the main fact that drives a vernier.
How many divisions does a Vernier scale have?
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.
What scale is used for sliding jaws?
The sliding jaw runs on the main scale with the guiding surface, which is accompanied by a vernier scale, in which it has a measuring tip on the left side.
What is zero error in calipers?
Zero error in the vernier caliper is a mathematical error due to which, The zero of the vernier scale does not coincide with the zero of the main scale. In other words, if the zero mark on the vernier scale doesn’t coincide with the zero mark on the main scale, then the error that occurs is called zero error. They are of 2 types.
What is the purpose of the internal jaws on a vernier caliper?
The internal jaws or upper jaws which are generally used to measure the internal diameter of a hollow cylinder . There is also a metal strip attached at the back of the vernier calipers which is used to measure the internal depth of a cylinder.
What is the name of the metal strip that slides over the main scale?
There is another small rectangular metal strip which is graduated with a special relation to that of the main scale, which is called the vernier scale which slides over this long metal strip it has a jaw similar to that of the main scale. There are two jaws on vernier caliper upper jaw and lower jaw.
How many jaws does a Vernier caliper have?
There are two jaws on vernier caliper upper jaw and lower jaw. These jaws together are used to hold the object firmly while measuring its length which is not possible with a metre scale. The external or lower jaws which are generally used to measure the diameter of a sphere or a cylinder.
What is the purpose of a Vernier caliper?
The main use of the vernier caliper is to measure the internal and external diameters of an object. The word caliper means any instrument with two jaws which is used to determine the diameters of objects. In ancient China, the caliper was born without the beginning of scale as the Qin Dynasty (AD 9).
Why is my Vernier caliper causing errors?
The errors occurred in vernier caliper due to its incorrect handling of the jaws on the workpiece. In measuring outside diameter, it must be ensured that the caliper bar and the plane of the caliper jaws are truly perpendicular to the workpiece.
