Reading of vernier calipers

Reading of vernier calipers

. least count of vernier calipers

. how to graduations are made on vernier calipers with 0.02mm least count.

. read vernier caliper measurement.

Vernier Calipers

Vernier calipers are available with different accuracies. The selection of the vernier caliper depends on the accuracy needed and the size of the job to be measured.

This accuracy/least count is determined by the graduations of the main scale and the vernier scale division.

Determining Least Count of Vernier Calipers

In the vernier calipers the main scale division (9mm) are divided into 10 equal parts in the vernier scale

i. e

One main scale division                  =1mm

(MSD)

One vernier scale division              =9/10mm

(VSD)

Least count is 1mm-9/10                 =1/10mm

The difference between one MSD and one VSD                                        =0.1mm

Reading vernier measurements

Vernier calipers are available with different graduations and least counts. For reading measurements with a vernier caliper the least count should be determined first. (The least count of calipers is sometimes marked on the vernier slide.)

The graduations of a common types of vernier caliper with a least count of 0.02mm. In this, 50 divitions of the vernier scale occupy 49 divitions (49mm) on the main scale.

Example for reading vernier caliper

Mainscale Reading            -60mm.

The vernier divition coinciding with the main scale is the 28th division.

Value                               =28×0.02

                                         =0.56mm

Reading =60+0.56=60.56mm