ISO standards for the Geometrical Product Specification and Verification: development of e-learning material on Run-Out Tolerances

Actually, rotating mechanical components are one of the most important part of manufacturing world: the role of run-out tolerances is strictly connected with the functionality, and therefore quality, of these crucial elements. In general, rotating parts often require run-out tolerances in order to prevent a not controlled motion (oscillations) and consequently dangerous dynamics mechanical effects. In this context, an oscillatory motion means an involuntary repetitive and periodical motion variation of a certain mechanical part. For these fundamental reasons, run-out tolerances can be considered as strategic designing tools useful to increase mechanical systems efficiency and reliability, improving performances and containing maintenance costs at the same time. According to ISO 1101: 2017, Run-out tolerances are partly orientation tolerances, since their axial nature, and partly location tolerances, since their radial nature. In particular, run-out tolerances are introduced to evaluate the variability limits of form (shape) and orientation of a geometrical element surface rotating around a certain reference axis.