In its basic sense, it can be defined as a mechanical measuring instrument used to measure values such as length, outer diameter, inner diameter, depth, and height in units of “mm” or “inches” with an accuracy of 0.01 mm. Generally, compass-type measuring instruments are designed in different sizes depending on the required area and mode of use.
Compasses, made of stainless steel, hold an important place in many fields. Generally, compasses consist of two parts: the ruler and the vernier (slider). The compass is hardened before it is finished, and after the grinding process, it is coated with a thin layer and put into use. After this process, the divisions are precisely marked and treated with acid to deepen the compass.
Compass is one of the essential measuring instruments that must be known especially in engineering fields. With the compass, which facilitates various length, depth, and diameter measurements, you can perform many operations.
Generally, compasses appear in different forms depending on the measurement systems and purposes of use.
Compasses according to measurement systems
Metric compasses: This type of compass performs measurements in millimeters. These types, which have high measurement accuracy, also allow measurements in inches.
According to the purpose of use
Compasses are divided into two categories depending on the purpose of use: slider compass and compasses for inner and outer diameter. The slider compass is also called vernier.
Compasses for inner and outer diameter also have a vernier. In this system, different jaws are used for measuring the inner and outer diameters.
Things to keep in mind when using a compass
To obtain correct and clear measurements when using a compass, you should pay attention to certain details. You can also consult these details to use the compass safely.
Make sure the measuring piece and the instrument are clean before measurement.
Look at the compass perpendicularly during reading.
Check that you are not exposed to magnetic fields during reading.
Choose compasses with the appropriate accuracy for measurement.
Avoid pressing the jaws of the compass on the measuring piece during measurement.
Remember that moving parts are not measured.
