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2024 | OriginalPaper | Chapter

13. Linear Sizes

Author : Stefano Tornincasa

Published in: Technical Drawing for Product Design

Publisher: Springer International Publishing

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Abstract

In the past, the verification of the local size of workpieces was carried out using traditional metrological instruments, such as callipers and micrometres, or using hard gauges to check for conformance with the global size tolerances. Today, in order to remove any ambiguities that existed in the traditional size tolerance specifications, it is necessary to both exploit the benefits of CMMs and other coordinate measuring systems that collect several points from the surface of a feature and, at the same time, to expand the concept of size tolerancing in order to communicate the function of a part more clearly. The specification operators defined in the ISO 14405 standards provide mechanisms that can be used to expand the domain of size specifications by means of a rich, new set of size modifiers, which provide new capabilities that can be used to address the requirements that arise from many industrial applications.

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Footnotes
1
ASME Y14.5:2018 derived line definition (Sect. 3.22): an imperfect line formed by the center points of all cross sections of the feature. These cross sections are normal (perpendicular) to the axis of the unrelated AME (see Fig. 7.​14).
 
2
As surface flaws may cause the center points of a derived median line (or plane) to form a discontinuous line or plane.
 
3
Envelope, actual mating: a similar perfect feature(s) counterpart of smallest size that can be contracted about an external feature(s) or of largest size that can be expanded within an internal feature(s) so that it coincides with the surface(s) at the highest points.
 
Literature
1.
go back to reference Morse E, Srinivasan V (2013) Size tolerancing revisited—a basic notion and its evolution in standards. J Eng Manuf 227(5):662–671CrossRef Morse E, Srinivasan V (2013) Size tolerancing revisited—a basic notion and its evolution in standards. J Eng Manuf 227(5):662–671CrossRef
2.
go back to reference ISO 14405-1:2016 Geometrical product specifications (GPS)—dimensional tolerancing ISO 14405-1:2016 Geometrical product specifications (GPS)—dimensional tolerancing
3.
go back to reference ISO 14405-3:2016 Geometrical product specifications (GPS)—dimensional tolerancing—Part 3: angular sizes ISO 14405-3:2016 Geometrical product specifications (GPS)—dimensional tolerancing—Part 3: angular sizes
4.
go back to reference ASME Y14.5:2018 Dimensioning and tolerancing. Engineering product definition and related documentation practices. American Society of Mechanical Engineers. New York ASME Y14.5:2018 Dimensioning and tolerancing. Engineering product definition and related documentation practices. American Society of Mechanical Engineers. New York
5.
go back to reference ASME Y14.5.1-2019 (2019) Mathematical definition of dimensioning and tolerancing principles. American Society of Mechanical Engineers, New York ASME Y14.5.1-2019 (2019) Mathematical definition of dimensioning and tolerancing principles. American Society of Mechanical Engineers, New York
6.
go back to reference Humienny Z (2021) Can ISO GPS and ASME tolerancing systems define the same functional requirements? Appl Sci 11:8269CrossRef Humienny Z (2021) Can ISO GPS and ASME tolerancing systems define the same functional requirements? Appl Sci 11:8269CrossRef
Metadata
Title
Linear Sizes
Author
Stefano Tornincasa
Copyright Year
2024
DOI
https://doi.org/10.1007/978-3-031-51187-5_13

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