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What is the least count of vernier caliper ? For what all purposes we use vernier caliper?

saurabhjain

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What is the least count of vernier caliper ? For what all purposes we use vernier caliper?

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Least count can calculated using the formula.
Least Count = Length of 1 MSD – Length of I VSD
Where MSD and VSD refer to Main Scale Division and Vernier Scale Division respectively
Generally N divisions on main scale coincide with N-1 divisions on vernier scale
1 VSD is equivalent to (N-1)/N main scale divisions
Using the formula for Least Count, we get
LC = 1 MSD – 1VSD
= 1 MSD – (N-1)/N MSD
= 1/N MSD

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Example for Calculation of Least Count of Vernier Calipers:
A vernier scale has the length of 9 main scale divisions and is divided in to 10 divisions. Calculate the Least Count of the Vernier Calipers.
Solution:
Since 9 divisions of the vernier scale coincide with 10 divisions of the main scale
VSD = 9 / 10 mm = 0.9 mm
MSD= 1 mm
Least Count= 1 MSD- 1VSD = 1mm - 0.9mm = 0.1mm

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1. Measuring Inside Dimensions

The upper set of jaws on the caliper can be used to measure inside dimensions, such as the diameter of holes on a piece of wood or metal. Measuring the precise diameters of holes in pipes, cylinders and other hollow objects is very important to any project or application. The jaws of the caliper can be easily slid into the hole to get the precise measurement. The caliper can also be used to measure inside dimension of holes with different shapes, e.g. square, rectangular, cylindrical, or hexagonal. Lastly, the upper jaws can be used to measure the distance between 2 objects. This can be done by simply putting the jaws of the caliper between the objects to get a measurement.

2. Measuring Outside Dimensions

The lower set of jaws on the Vernier caliper can be used to measure outside dimensions. Outside dimensions include the outer diameter of a cylinder and total length of an object. The outer diameter of cylindrical objects can be measured by simply clamping the lower jaws of the caliper around the object. The caliper can also measure the length or width of an object by placing the object between the caliper’s jaws.

3. Measuring Depth

The Vernier caliper has a depth probe on the rear part. This probe can be extended from the edge of the hole to the other end of the hole. With the depth probe, one can measure the precise depth of a hole in any piece of wood or metal.

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Measuring with a vernier caliper takes skill and a gentle hand to obtain accurate measurements.....whilst the gauge is (generally) in 0.02mm (Metric) graduations (although Saurabh's explanation is far more comprehensive), the design of the unit is very prone to movement, damage, wear and false readings.

This has resulted in Precision Engineers nicknaming the Vernier Caliper the "Very-near" caliper....as in the hands of a non-expert, it only gets "very near" to the actual measurement.

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Least count of any instrument is the least value which can be measured with the instrument.

And least count of vernier caliper is

Value of smallest divission on main scale / Number of divisions on vernier scale.

It is used to take linear mesurement like length. Diameter, Internal diameter, Height etc.

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On 10/2/2013 11:36:59, Binay Kumar Agrawal said:

0.02

Can be use all measurements eg: (in,out)dia:, length, depth,etc... least count is the smallest amount we can measure 

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In answers above this comment some had written that 

0.02.  

Friends we are engineers and units matters in our field/work. Please all take care about this.

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As L.C=smallest division on main scale/Total no of division on vernier scale.. in this Vernier The smallest division on main scale is 1 mm and Total no of division on vernier scale.are 10.So L.C=1/10= 0.1 mm .. 

Applications;

1 To measure the Outer Diameter and length of  cylindrical objects.

2 To measure the Inner Diameter of Pipes,tubes or Holes

3 To measure the Depth of cavities or Holes.

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least count of Varnier calliper is -0.02

The varnier calliper is not used for all types of measurement .It is used for the measurement of iner diameter , outer diameter and iner deapth of any specimen

 

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