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BS EN ISO 21204:2020

BS EN ISO 21204:2020

$198.66

Geometrical product specifications (GPS). Transition specification

Published By Publication Date Number of Pages
BSI 2020 62
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This document defines a number of specification operators for the specification of extended edge transition features between features. An edge transition feature is an integral feature connecting two adjacent integral features. The extended edge transition feature includes portions of the adjacent features. All these specifications apply to any line in a defined direction in the extended edge transition feature. This document also defines the specification modifiers and the drawing indications for such transition specifications.

The proportions and dimensions of the graphical symbols to be used are also specified.

The specifications defined in this document are suitable for relatively simple edge transition functions, for example ensuring assembly without interference. For more complex functions, geometrical tolerancing offers more precise tools.

This document is by intention limited to only edge transition features between two planes and between a cylinder and a plane nominally perpendicular to it.

Annex A gives the first approach for an algorithm to identify toleranced features and adjacent reference sections. This algorithm is subject to change as more experience is gathered.

This document provides a set of tools to express several transition specifications. It does not present any information on the relationship between a function or a use and a transition specification.

NOTE 1

Corners (the transition between three or more features) are not edge transition features and are consequently not covered by this document.

NOTE 2

An edge transition feature exists between two single features. A defined edge transition feature has a defined nominal shape and is not sharp ( r = 0).

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Basic concepts
12 5 General indication rules
5.1 Symbols
13 5.2 Indications using the transition specification symbol
5.2.1 General
14 5.2.2 Indications in face view
5.2.3 Indications in 3D
15 5.3 Indication areas around the transition specification symbol
6 Circular edge transition feature indications
6.1 Fixed radius profile specification
16 6.2 Variable radius profile specification
17 6.3 Consistent radius profile specification
18 6.4 Maximum material radius boundary specification
6.5 Least material radius boundary specification
19 6.6 Maximum material radius boundary with profile specification
20 6.7 Least material radius boundary with profile specification
21 6.8 Combined maximum material and least material radius boundary specification
22 7 Chamfer edge transition feature indications
7.1 Fixed chamfer profile specification
25 7.2 Variable chamfer profile specification
26 7.3 Consistent chamfer profile specification
27 7.4 Maximum material chamfer boundary specification
28 7.5 Least material chamfer boundary specification
29 7.6 Maximum material chamfer boundary with profile specification
30 7.7 Least material chamfer boundary with profile specification
31 7.8 Combined maximum material and least material chamfer boundary specification
32 8 Elliptical edge transition feature indications
8.1 Fixed elliptical profile specification
33 8.2 Variable elliptical profile specification
34 8.3 Consistent elliptical profile specification
8.4 Maximum material elliptical boundary specification
35 8.5 Least material elliptical boundary specification
36 8.6 Maximum material elliptical boundary with profile specification
37 8.7 Least material elliptical boundary with profile specification
38 8.8 Combined maximum material and least material elliptical boundary specification
39 9 Edge transition feature defined by CAD
9.1 CAD profile specification
40 9.2 Maximum material CAD profile boundary specification
41 9.3 Least material CAD profile boundary specification
42 9.4 Maximum material CAD profile boundary with profile specification
43 9.5 Least material CAD profile boundary with profile specification
44 10 Rules for supplemental indications
10.1 Symbols
10.2 Limits of different nominal shapes
45 10.3 Extent of the toleranced feature
10.4 Tolerance zone offset
46 10.5 Indication of primary adjacent reference section
10.6 Indication of several toleranced features
10.7 Indications using the between symbol
47 10.8 Around a feature indications
48 10.9 General transition specifications
49 Annex A (informative) Algorithm for defining extended edge transition sections and adjacent reference sections
56 Annex B (informative) Example of approximately equivalent specification of extended edge transition features
58 Annex C (normative) Relations and dimensions of graphical symbols
59 Annex D (informative) Relation to the GPS matrix model
60 Bibliography

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BS EN ISO 21204:2020
$198.66