Overview
ISO 10579:2010 is an international standard issued by the International Organization for Standardization (ISO) that provides comprehensive rules for dimensioning and tolerancing non-rigid parts within geometrical product specifications (GPS). This standard addresses the unique challenges posed by flexible or thin components that can deform under their own weight or during handling, affecting the accuracy of dimensional verification and assembly processes.
The standard specifically covers the conditions under which features of non-rigid parts must be restrained to ensure proper verification of dimensions and tolerances as specified on engineering drawings. It is essential for industries where precise measurement and assembly of flexible parts are crucial, such as automotive, aerospace, and manufacturing of rubber or plastic components.
Key Topics
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Scope and Definition of Non-Rigid Parts
Non-rigid parts are defined as those prone to deformation beyond dimensional or geometrical tolerances when in a free state, under gravity alone. The standard encompasses materials both inherently flexible (e.g., rubber, plastics) and inherently rigid but flexible due to thin geometry (e.g., thin metal sheets).
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Measurement Conditions
ISO 10579:2010 mandates measurement and verification under restrained conditions where the part is supported or held to simulate the assembled state. This ensures dimensional checks reflect real operating conditions rather than distortions due to gravity or handling.
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Drawing Indications and Symbols
The standard prescribes specific indications on technical drawings, including the “ISO 10579-NR” statement to denote non-rigid parts, and the use of modifying symbols to qualify geometrical and dimensional tolerances in the free state. Notes specifying restraint conditions, gravity direction, and orientation must accompany these drawings to prevent ambiguity.
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Basic Principles for Dimensioning and Tolerancing
The allowable distortion of non-rigid parts during inspection must not exceed tolerances that would prevent assembly or proper function. Forces applied to bring parts within tolerances should not exceed those expected during normal assembly.
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Integration within the GPS Matrix
ISO 10579:2010 is recognized as a global GPS standard and interacts with other standards in the GPS matrix, influencing the control of form, orientation, location, and run-out characteristics for non-rigid parts.
Applications
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Manufacturing and Quality Control
Implementing ISO 10579:2010 allows manufacturers to set realistic and standardized tolerances for flexible parts, improving the reliability of quality control processes and reducing defects caused by part deformation during inspection.
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Automotive and Aerospace Components
Non-rigid parts such as gaskets, seals, thin panels, and flexible connectors require precise dimensioning. This standard helps ensure their dimensional compliance even when these parts deform during handling.
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Rubber, Plastic, and Thin Metal Fabrication
Industries producing inherently flexible materials benefit from clear guidance on how to dimension and tolerate parts that cannot be measured accurately in their free state, facilitating better assembly and service life performance.
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Assembly and Inspection Procedures
By defining restraint methods consistent with assembly conditions, this standard aids engineers and quality assurance teams in establishing uniform inspection protocols, minimizing variability, and improving integration of parts.
Related Standards
ISO 10579:2010 should be used in conjunction with complementary GPS standards to ensure a holistic approach to dimensioning and tolerancing:
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ISO 1101:2004 – Geometrical tolerancing including form, orientation, location, and run-out tolerances, fundamental for defining tolerance frames and symbols referenced by ISO 10579.
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ISO 2692:2006 – Maximum Material Requirement (MMR), Least Material Requirement (LMR), and Reciprocal Requirement (RPR) tolerancing principles that support position and size control.
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ISO 5458:1998 – Positional tolerancing techniques that assist in defining precise locations of features on flexible parts.
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ISO 5459:1981 – Datums and datum systems crucial for defining reference points and planes that help restrain non-rigid parts for measurement.
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ISO/TR 14638 – The GPS master plan which outlines the overall GPS matrix model referenced by ISO 10579 for positioning within the broader GPS framework.
Utilizing ISO 10579:2010 leads to improved product reliability by addressing the challenges of measuring and assembling non-rigid parts. It provides standardized rules to harmonize dimensioning and tolerancing practices internationally, ensuring that flexible components meet design requirements despite their tendency to deform.
Open preview (PDF)Geometrical product specifications (GPS) — Dimensioning and tolerancing — Non-rigid parts
