Theory : Principle of vernier calipers – N divisions on the vernier scale is equal to (N-1) divisions on the main scale.
Example;
vernier scale is constructed by taking 49 main scale divisions dividing them into 50 divisions
ie. 49mm divided into 50 parts
therfore
1 vsd=49/50 mm=0.98mm
1 MSD=1mm
Substituting in formula
L.C = 1 M.S.D - 1 V.S.D
L.C=1-0.98=0.02mm
N V.S.D = (N-1) M.S.D
1 V.S.D = M.S.D
Least count (L.C) of vernier calipers : Minimum length or thickness measurable with the vernier calipers is called its least count.
Least count (L.C) = 1 M.S.D – 1 V.S.D
L.C = 1 M.S.D – M.S.D
L.C = 1 M.S.D [ 1-]
L.C = =
Where S is the value of one Main scale division and N is the number of equal divisions on the vernier scale.
The least count of the vernier can be measured by using the formula stated below.
Least count (L.C) = 1 M.S.D - 1 V.S.DExample;
vernier scale is constructed by taking 49 main scale divisions dividing them into 50 divisions
ie. 49mm divided into 50 parts
therfore
1 vsd=49/50 mm=0.98mm
1 MSD=1mm
Substituting in formula
L.C = 1 M.S.D - 1 V.S.D
L.C=1-0.98=0.02mm
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