runout

Run-out or runout is an inaccuracy of rotating mechanical systems, specifically that the tool or shaft does not rotate exactly in line with the main axis. For example; when drilling, run-out will result in a larger hole than the drill's nominal diameter due to the drill being rotated (off axis instead of in line). In the case of bearings, run-out will cause vibration of the machine and increased loads on the bearings.

En technologie et en mécanique, les spécifications géométriques, portées sur le dessin technique ont pour objet la maîtrise de la géométrie de la pièce à fabriquer.