GD&T Runout and Concentricity 2

Question 1

What is the key difference between circular runout and total runout?

Accepted Answer

Circular runout applies to a single cross-section while total runout applies along the entire surface

Answer

Total runout only applies to flat faces while circular runout applies to cylinders

Answer

Circular runout requires a more expensive gauge than total runout

Answer

Total runout is always a tighter tolerance than circular runout

Question 2

When a runout tolerance is applied to a conical surface, what does the tolerance zone represent?

Accepted Answer

Two lines along the cone surface separated by the tolerance value

Answer

Two coaxial cylinders

Answer

Two parallel planes perpendicular to the axis

Answer

A cylindrical zone centered on the datum axis

Question 3

A shaft has a total runout tolerance of 0.05 mm. During inspection, the FIM (Full Indicator Movement) reading is 0.04 mm. The part is:

Accepted Answer

Accepted because the FIM is within the 0.05 mm tolerance

Answer

Rejected because FIM must be exactly equal to the tolerance

Answer

Rejected because total runout requires zero FIM

Answer

Accepted only if re-measured on a different datum

Question 4

Concentricity is most accurately described as a control of:

Accepted Answer

The median points of diametrically opposed surface elements relative to a datum axis

Answer

Surface elements relative to a datum axis

Answer

The center of a circle relative to a datum plane

Answer

The axis of a cylinder relative to a datum surface

Question 5

Which of the following characteristics makes concentricity difficult to verify?

Accepted Answer

It requires deriving median points from opposing surface elements rather than direct surface measurement

Answer

It requires specialized runout equipment not commonly found in shops

Answer

It cannot be measured on a surface plate

Answer

It requires the part to be rotating during inspection

Question 6

A designer wants to control wobble of a rotating disk face. Which GD&T control is most appropriate?

Accepted Answer

Circular runout applied to the face

Answer

Flatness

Answer

Concentricity

Answer

Parallelism

Question 7

In GD&T, what does MMC (Maximum Material Condition) bonus tolerance apply to for runout callouts?

Accepted Answer

MMC bonus tolerance is not applicable to runout tolerances

Answer

Runout tolerances can use MMC modifiers on the datum feature

Answer

Runout tolerances always use MMC on the controlled feature

Answer

MMC applies to runout only for external features