Measuring runoutgd&t

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.

Measuring runoutcalculator

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

Also note that to correct for a broad feeler gauge or a loose-fitting drill bit: ROC = (D2-W2)/8T Where: W = the width of the feeler gauge, or if the drill bit can be moved back and forth under the straight edge by the total amount W D = mirror diameter, T = gauge thickness or bit diameter.

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.

Totalrunout

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.