How to know the sizes of my plastic containers? -Vernier Caliper Usage
Vernier Caliper is a widely used high-precision basic Instrument of measurement. It is consist of two types of scale – The main scale and the Vernier scale that can slide along the main scale.
The Function of Vernier Caliper: easily measure outer diameter, inner diameter and depth.
Measuring an Object With the Main Jaws:
1. Take your plastic bottles/ plastic jars close the main jars around it.
2.To read off the measurement you just made:
3.Find the last value on the main scale before the zero line on the vernier scale
4.Find the first line on the vernier scale, that lines up perfectly with a line on the main scale, and remember that value
5.take that value and divide by the number of divisions on the vernier scale,and multiply the value by the smallest division of the main scale
Three types of vernier calipers have been specified to meet external and internal measurement requirements of up to 2000mm with the accuracy of 0.02, 0.05 and 0.1 mm.
| Types |
Main Scale Least Count(mm) |
The Unit of the Vernier scale(mm) | accuracy (mm) |
| 10 Divisions | 1 | 9 | 0.1 |
| 20 Divisions | 1 | 19 | 0.05 |
| 50 Divisions | 1 | 49 | 0.02 |
Measurement Reading Formula：
Obtained Reading(L)= Main Scale Reading (X)+ Vernier Scale Reading (n*accuary)
10 Divisions
50 Divisions
One small division on main scale = 1 mm No. of divisions on Vernier scale = 50 50
Vernier scale divisions = 49 divisions on main scale (or 49 mm) Each division on
Vernier scale = (49/50) mm Difference between one main scale division and one
Vernier scale division = 1 – (49/50) mm = (50 – 49)/50 = (1/50) mm = 0.02 mm
Application range
1. Measuring the width of workpieces
2. Measuring the outer diameter of workpieces
3. Measuring the inner diameter of workpieces
4. Measuring the depth or step height of workpieces
