Saturday, 22 September 2018

Vernier Callipers- Formula, Construction, Expt.-Every Engineer Must know

Vernier Callipers- Mechanical Engineers must know about this tool:Vernier Callipers is used to measure the dimensions of the given specimen like diameter(Outer Dia and Inner dia),length and depth etc.The Topics which comes under this article of Vernier Callipers are as follows.

1.Construction of Vernier Callipers:

1. Calipers are nothing but the Jaws which are used to fix the given component.
2. Vernier Callipers consists of two jaws i.e.Upper Jaw and the Lower Jaw.
3. Upper Jaws are used to measure the Inner diameter of the given specimen whereas Lower jaws are used to measure the outer diameter of the given specimen.
4. The measuring depth probe is used to measure the depth of the given specimen.
5. Vernier Caliper consists of two scales.One is Main Scale and the other is Vernier Scale.Both these scales are measured in Inches as well as in millimeter.
6. The locking pin is used to tighten the jaws at the given measurement.

How can you check any Measurement?

• In order to calculate the dimensions,the given specimen is to be placed between the two jaws.One is fixed jaw and the other is movable jaw.
• The object is to be placed in between the two jaws and is fixed by means of locking pin.

2.Diagram Of Vernier Callipers

3.Formula of Vernier Callipers:

The formula of Vernier callipers was shown below.

 Measurement = M.S.R+(V.S.R*L.C)

4.Least Count of Vernier Callipers:

The least count of Vernier Callipers was calculated as follows.

 Least Count(L.C)=1 MSD-1VSD

5.Experiment of Vernier Callipers:

Calculation of M.S.R:

If the zeroth division of the vernier scale is coincided with (some number) on the Main scale(consider it as 10) then 10mm is the Main scale Reading(M.S.R).

Calculation of V.S.R:

After that,you need to check which division on the vernier is exactly coinciding with the main scale as shown below in the fig.

• If you see in the above figure,10th division in the vernier scale is exactly coinciding with a division on the Main scale.Therefore you need to count the no.of divisons from 0-10.
• The no.of divisons from (0-1) on vernier scale is 5 divisons.

Therefore,upto (0-10),it is 50 divisons.So,take the V.S.R=50.

Calculation of L.C:

• Least Count(L.C)=1 MSD-1VSD
• 1 VSD =(49/50)MSD

= 0.98 MSD

As, Least Count(L.C)=1 MSD-1VSD

Therefore,

(L.C)=1 MSD- 0.98 MSD

=0.02 mm

Therefore,

Measurement = M.S.R+(V.S.R*L.C)

=10+(50*0.02)

=10+1 =11mm

In this way,you can measure the dimension of any object.

This is the detailed explanation of Vernier Callipers along with its Formula,Construction,Experiment.Every Mechanical Engineer Must has to know this tool and the experiment too.If you like this article,Then share it with all your friends.