If one needs tfind out external or internal linear dimensions of parts, Vernier callipers are used.In particular, with their help, you can make accurate measurements of a diameter and depth of different components.
Types of Vernier callipers
By operating principle:
Mechanical. They are fitted with a special auxiliary scale which allows tmeasure part dimensions up tfractions of a millimetre. There are alsdial models. They are considered tbe more easy tuse.
Digital. These are equipped with a monochrome or colour display. They allow getting very accurate results. As a rule, they can be switched from imperial tthe metric system and vice versa. Usually, such instruments have a higher price than mechanical ones.
These instruments can be alsfitted with a rod tmeasure the depth of holes and slots. Besides, these tools differ in dimensions and the accuracy of measurements.
Vernier callipers: maintenance tips
Follow the manufacturer’s recommendations. Examine the tool thoroughly before using it. Make sure it is clean, dry and doesn’t have any mechanical or corrosion damage. If the tool is fitted with twscales, make sure the zermarks are lined up.
While making measurements, make sure the jaws of the instrument are properly positioned relative tthe part. For example, in order tfind out the diameter of a component, place them over the furthest points on the circle. Mind that the instrument should be on the same plane with the component’s axis. When the jaws are properly positioned, turn the lock screw ttighten them, remove the instrument from the object and read the results.
When the work is done, clean and degrease the tool. Make sure that there is a slight distance between the jaws when the item is stored. Don’t forget tloosen the lock screw.
Occasionally, apply some corrosion inhibitor tthe tool.
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