Exam 25: Concentricity and Symmetry Tolerances

Explain concentricity.

In certain applications, the function of a part requires defining the symmetry deviation of a width feature of size relative to a datum center plane or datum axis. In this application, the symmetry tolerance also limits the ____________________ of the derived median plane.

In certain applications, the function of a part requires defining the concentricity deviation of a cylindrical feature of size relative to a datum axis. In this application, the ____________________ distance between median points of the toleranced diameter and the datum axis is half the concentricity tolerance value.

The tolerance zone shape for symmetry is the space between two ____________________ planes.

Precision balance is a functional requirement of a pendulum.

Concentricity and symmetry tolerances do not affect orientation and form of the axis or center plane of the toleranced feature of size (e.g., parallelism, perpendicularity, straightness or flatness).

What are two examples of real-world applications of concentricity or symmetry tolerances on a drawing?

One difference between position (RFS) and concentricity is that position controls the location of the axis of the unrelated actual mating envelope, and concentricity controls the location of a cloud of ____________________ points.

A symmetry tolerance cannot be verified with dial indicators.

What are the two parts needed when verifying a concentricity or symmetry tolerance?

A concentricity tolerance can be verified with dial indicators, a CMM, or by other methods.

What are two similarities between position and symmetry?

A(n) ____________________ point is the mid-point of a two-point measurement.

The tolerance zone shape for concentricity is the space within a cylinder.

What is a symmetry tolerance?