Effect of datum system and datum hierarchy on the design of functional components produced by additive manufacturing: a systematic review and analysis

Vakouftsis, Christos; Mavridis-Tourgelis, Andreas; Kaisarlis, Georgios; Provatidis, Christopher G.; Spitas, Vasilios

doi:10.1007/s00170-020-06152-6

Cited by 7 publications

(1 citation statement)

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“…The aim is to provide contradiction-free rules and operators that allow designers to clearly and completely describe the acceptable variations of geometrical product characteristics such as size, orientation, location and run-out [4,5]. The capability of the existing tolerancing tools given in the ISO GPS system standards (ISO Geometrical Product Specifications system standards) is crucial both for classical machining and forming as well as for modern production methods such as additive manufacturing [6,7]. The ISO/TC 213 works are boosted by industries, mainly automotive and aerospace, that need indications to uniquely define how far the geometry of a manufactured part may be away from the nominal theoretically exact geometry and, when assembled, still operate according to the functional requirements.…”

Section: Introductionmentioning

confidence: 99%

Geometrical Tolerances—Separate, Combined or Simultaneous?

Humienny

2023

Applied Sciences

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The 14 geometrical tolerances defined in ISO 1101 are supplemented by the alphanumerical symbols defined in this standard and some other standards. The symbols CZ (combined zone), SZ (separate zones) and SIM (simultaneous requirement), which are crucial for the development of robust measuring programs for coordinate measuring machines, were introduced at different times or in different standards. It is shown that the symbol definitions are not always complete. Sometimes there are no univocal rules for their use, which, in some cases, leads to ambiguity in the specifications given by a designer. It is also pointed out that certain functional requirements can be controlled by different symbols, and it is not always clear if the indications are equivalent. This makes it difficult to understand and interpret a drawing by a metrologist and, thus, may lead to uncertainty in the assessment of product conformity regarding specifications. The identified ambiguities and problems in the specification of functional requirements are shown in several figures. Corrections and additions to current standards are proposed.

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Section: Introductionmentioning

confidence: 99%