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Here are explanations on the correct method of taking measurements using a vernier caliper, an
essential tool in the machining workplace, and recommended vernier caliper products.
A straightforward explanation of indispensable maintenance and inspection methods for measuring
tools is also provided here.
Vernier calipers can be used to take inside and outside measurements, as well as to measure
steps and depth. They are one of the most common measuring tools in the machining
workplace.
Here are the names of the various parts and the shapes that they can be used to measure.
In addition to standard styles, there are various other types of vernier calipers that are
adapted to measure different shapes and features, such as narrow grooves, hole pitch, pipe
thickness and so on.
Select the vernier calipers that are most suitable for the shape and features of the item
measured.
● For pipes
● Hole pitch
● Points
● Inside
Source: Niigata Seiki Co., Ltd.
■ When measuring a cylindrical object
Apply the jaws of the vernier calipers so that they are at right angles to the axis of the
cylinder.
The measured value is read from a combination of the graduations on the main scale and the sub-scale (vernier scale). The graduations in the diagram below should be read as 73.000 mm in Example 1, 73.50 mm in Example 2, and 73.55 mm in Example 3.
Source: Niigata Seiki Co., Ltd.
Here is some information of the main components of daily inspections aimed at maintaining the
accuracy of your vernier calipers.
Check whether your vernier calipers are capable of accurate measurements.
If there is unevenness, use an oil stone to dress the main scale.
The 0 and 10 graduations on the vernier scale must be aligned with the graduations on the main scale.
Check whether any light is visible through the outside jaws when they are closed and held up to a source of illumination.
Place the vernier calipers vertically on a reference surface, and similarly to 2., check whether the 0 and 10 graduations are aligned with those on the main scale.
Source: Niigata Seiki Co., Ltd.