Measure the total run out (RUO)

The concentricity and the axial run-out are part of the group of so called running tolerances. The tolerated elements of the axial run-out tolerance are perimeter line or circular line. The tolerated elements of the total running tolerance are circumferential surface and end surface.

Concentric tolerance
The tolerance zone is limited in the measuring plane vertical to the axis by two concentric circles at distance t, the common centre of which is on the reference axis.

Total concentric tolerance
The tolerance zone is limited by two coaxial cylinders at distance t, which are parallel to the reference axis.

Axial run-out tolerance
The tolerance zone is limited by two parallel levels at distance t, vertical to the reference axis.

Total run-out tolerance
The tolerance zone is limited by two parallel levels at distance t, which is vertical to the reference axis.

Technical drawing: Measuring of circular runout (direction: radius)

Technical drawing: total runout tolerance (direction: radius)

Technical drawing: Measuring of circular runout (rotational axis)

Technical drawing: Measuring of total runout (direction: rotational axis)

The concentricity is an extremely important running tolerance in the dynamics. The concentricity plays a role in components in which a rotating element exerts mechanical forces on other components or a linear moving circular profile is inserted into a suitable guide. Deviations from the concentricity tolerance can cause extreme damage in the finished workpiece, which is why the components tested are mostly subject to 100 % checks. For instance, this affects camshafts, drive shafts and gears.