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Introduction to Roundness Instruments

What is roundness?

Roundness is also known is circularity. A circle is defined as a line of constant radius from a point (the centre).
Roundness is a value used to quantify errors in the circle. For example, i.e. deviations in the distance from the centre of the circle. More correctly, roundness can be considered as “out of roundness”

How is roundness measured ? Read here

Standards for roundness

There are many different standards, international, national, industry or company.

Main types of roundness instrument

There are two fundamental types of roundness instrument. They are defined by what happens to the workpiece during measurement.
The first one is stationary workpiece. It is commonly used for measuring components that are not rotationally symmetric. For example, measuring a cylinder bore in an engine block.
The second one is rotating workpiece. It is useful for measuring symmetric components, especially those with a large axial extent.

Understand roundness instruments - Main components of the instrument

Main components include stylus, gauge, spindle, arm, column, framework and electronics. 


Gauging and data acquisition

Basic components of the data acquisition system of a typical roundness instrument.

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