Technical product documentation and specification - Model …

1 Raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 8888:2011 Technical productdocumentation andspecificationLicensed Copy: Ulster ATHENS, University of Ulster, 07/05/2012 21:08, Uncontrolled Copy, (c) The British Standards Institution 2012 Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. BSI 2011 ISBN 978 0 580 72757 3 ICS ; following BSI references relate to the work on this standard:Committee reference TDW/4/8 Draft for comment 11/30234091 DCPublication historyOriginally published as BS 308-1, BS 308-2 and BS 308-3 First published as BS 8888 August 2000 Second edition, October 2002 Third edition, October 2004 Fourth edition, October 2006 Fifth edition, October 2008 Sixth (present) edition, December 2011 Amendments issued since publicationDateText affectedBS 8888:2011 BRITISH STANDARDL icensed Copy: Ulster ATHENS, University of Ulster, 07/05/2012 21.

2 08, Uncontrolled Copy, (c) The British Standards Institution 2012 ContentsForewordiv1 Scope12 Normative references13 Terms and definitions14 Standards underpinning BS 88882 Section 1: Technical product documentation45 Types of documentation46 Drawing sheets47 Title block78 Scales109 General tolerances1010 Conventions for arrangement of views on a TPD1211 Mechanical engineering drawings1512 Diagram1713 Lines, arrows and terminators1814 Lettering1815 Projections1916 Views1917 Sections2018 Symbols and abbreviations2019 Representation of features2220 Representation of components22 Section 2.

3 Technical product specification2521 Fundamental principles2522 Dimensioning and tolerancing2723 Rules for parenthetic statements3224 Features3225 Datums and datum systems3326 Rules for datums and datum systems4427 Geometrical tolerances5328 Surface texture indication6629 Graphical representation and annotation of 3-D data (3-D modellingoutput)6730 Verification6731 Security6832 Storage and retrieval6833 Marking6934 Protection notices70 AnnexesAnnex A (normative) Normative references71 Annex B (informative) Bibliography77 Annex C (normative) Geometrical tolerancing79 Annex D (normative) Document security Enhanced85 Annex E (informative) Technical product specification Geometrical productspecification (GPS)

4 86 List of figuresFigure 1 Size A4 to A05 Figure 2 Title block in compact form9 Figure 3 Title block with person name fields on additional line9 Figure 4 Examples of general tolerance notes12 Figure 5 Labelled view method13 Figure 6 First angle projection method14 Figure 7 First angle projection method Graphical symbol14 Figure 8 Third angle projection method15 Figure 9 Third angle projection method Graphical symbol15 BRITISH STANDARDBS 8888:2011 BSI 2011 iLicensed Copy: Ulster ATHENS, University of Ulster, 07/05/2012 21:08, Uncontrolled Copy, (c)

5 The British Standards Institution 2012 Figure 10 Section in one plane16 Figure 11 Section in two parallel planes16 Figure 12 Section in three contiguous planes17 Figure 13 Auxiliary view showing true shape of inclined surface20 Figure 14 Permissible interpretations when no form control is given on thedrawing28 Figure 15 Dimensioning of keyways31 Figure 16 Interrelationship of the geometrical feature definitions32 Figure 17 Example of tolerance zone constrained in orientation from adatum34 Figure 18 Examples of a tolerance zone constrained in location from adatum34 Figure 19 Illustration of features used for establishing a single datum from acylinder36 Figure 20 Datum feature indicator41 Figure 21 Single datum target frame42 Figure 22 Datum target symbol42 Figure 23 Non-closed datum target line42 Figure 24 Closed datum target line43 Figure 25 Datum target area43 Figure 26 Indicator for single datum target point43 Figure 27 Indicator for single datum target line44 Figure 28 Indicator for single datum target surface44 Figure 29 Location of datum letter symbol(s)

6 In the tolerance frame44 Figure 30 Attachment of a datum indicator for a single feature considered afeature of size46 Figure 31 Attachment of a datum indicator for a single feature not considereda feature of size47 Figure 32 Indication of datums established from datum targets47 Figure 33 Simplification of drawing indication when there is only one datumtarget area48 Figure 34 Examples of single datums established from a complete cylinder, aportion of a cylinder or with a contacting feature49 Figure 35 Indication of dimension of a circular/square area50 Figure 36 Indication of dimensions of a rectangular area50 Figure 37 Examples of indication of datums in the tolerance frame51 Figure 38 Examples of complementary indication52 Figure 39 Example of application of modifieron the secondary datum53 Figure 40 Meaning of the specification given in Figure 3953 Figure 41 Tolerance applying to more than one feature57 Figure 42 Indications qualifying the form of the feature within the

7 Tolerancezone57 Figure 43 Requirements given in tolerance frames one under the other57 Figure 44 Arrowhead terminating on the outline of the feature or as anextension58 Figure 45 Arrowhead terminating as an extension of the dimension line58 Figure 46 Width of tolerance zone applying to the specified geometry59 Figure 47 With of tolerance zone, otherwise indicated59 Figure 48 Orientation of the width of a positional tolerance zone60 Figure 49 Orientation of the width of an orientation tolerance zone60 Figure 50 Tolerances perpendicular to each other60 Figure 51 Cylindrical and circular tolerance zones61 Figure 52 Tolerance zones applied to separate features61 Figure 53 Single tolerance zone applied to separate features61 Figure 54 Examples of the use of the all around symbol62 Figure 55 Examples of MD and LD 62 Figure 56 TED.

8 Enclosed in a frame63 Figure 57 Examples of tolerances of the same characteristic63 Figure 58 Tolerance applied to a restricted part of a feature64 BRITISH STANDARDBS 8888:2011ii BSI 2011 Licensed Copy: Ulster ATHENS, University of Ulster, 07/05/2012 21:08, Uncontrolled Copy, (c) The British Standards Institution 2012 Figure 59 Projected tolerance zone64 Figure 60 Indication of the maximum material requirement65 Figure 61 Indication of the least material requirement65 Figure 62 Free state condition65 Figure 63 Use of several specification modifiers65 Figure 64 BS 8888 independency system symbol69 Figure 65 BS 8888 dependency system symbol70 Figure Model of the relationship between specification .

9 Verification andthe actual work piece87 Figure The link between design intent and metrology88 List of tablesTable 1 Sizes of trimmed and untrimmed sheets and the drawing spaceA)5 Table 2 Number of fields6 Table 3 Basic types7 Table 4 Identifying data fields in the title block8 Table 5 Descriptive data fields in the title block8 Table 6 Administrative data fields in the title block9 Table 7 Scales10 Table 8 Permissible deviations for linear dimensions except for brokenedges11 Table 9 Permissible deviations for broken edges (external radii and chamferheights)

10 11 Table 10 Permissible deviations of angular dimensions11 Table 11 Datum features and datum target symbols33 Table 12 Interpretation of single datum references37 Table 13 Common datum or datum system taken from a cylinder and aplane39 Table 14 Common datum or datum system taken from two cylinders40 Table 15 Datum system taken from two cylinders and a plane41 Table 16 Symbols for geometrical characteristics55 Table 17 Additional symbols56 Table Examples of geometrical tolerancing79 Figure The duality principle90 Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 92, an inside back cover and a back STANDARDBS 8888:2011 BSI 2011 iiiLicensed Copy: Ulster ATHENS, University of Ulster, 07/05/2012 21:08, Uncontrolled Copy, (c) The British Standards Institution 2012 ForewordPublishing informationThis British Standard is published by BSI and came into effect on31 December 2011.