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Concentricity Meaning in CNC Field

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Concentricity Meaning in CNC Field

Concentricity Meaning in CNC Field

In the field of cnc machining, concentricity is a crucial geometric tolerance parameter used to describe the alignment of the axes of two or more cylindrical surfaces, circular features, or holes with respect to a reference axis. Specifically, concentricity refers to the degree of deviation between the central axis of one circle or cylinder relative to another specified axis. High concentricity means that these axes have very little deviation and are nearly perfectly aligned, while low concentricity indicates a larger deviation between the axes.

Understanding Concentricity

Geometric Meaning: Concentricity measures the coaxial alignment of two circles or cylinders. Ideally, when two circles or cylinders are perfectly concentric, their axes completely coincide, meaning their centers are located at the same point.

Tolerance Representation: On engineering drawings, concentricity is typically denoted by the symbol ⊙, followed by the tolerance value. For example, if a hole and an outer cylinder require high concentricity tolerance, it might be marked as ⊙ 0.02 mm, indicating that the centerline of the hole should not deviate from the centerline of the outer cylinder by more than 0.02 mm.

Concentricity vs. Other Tolerances

Coaxiality: Very similar to concentricity, but coaxiality focuses on the alignment of the entire axis rather than just the center points. Coaxiality is a more stringent tolerance requirement.

Position Tolerance: Specifies the allowable deviation of a feature relative to a datum, not just the alignment of axes.

Roundness: Describes the perfect circularity of a single circle or cylindrical surface without considering the relationship between different features.


Consider a part that needs to be assembled, designed with an outer cylinder and an inner hole. If there is a significant deviation between the centerlines of the inner hole and the outer cylinder, the assembled part may experience rotational imbalance, increased noise, or accelerated wear. Therefore, it is crucial to maintain the concentricity of the inner hole and outer cylinder within a specific tolerance range.

In practical operations, factors such as the precision of machining equipment, the material of the workpiece, and the machining methods can all impact the final concentricity of the part. Engineers must comprehensively consider these factors during the design and manufacturing process.

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