CAD standards

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CAD Standards have been created to improve productivity and interchange of Computer-aided design documents between different offices and CAD programs, especially in architecture and engineering.

Contents

[edit] AEC (Architecture Engineering and Construction) Standards

[edit] CAD Layer Standards

Most common:

  • AIA Cad Layer Guidelines, 2nd edition (1997), has a great usage in the USA;
  • ISO 13567-1/3, International standard, common in Northern Europe;
  • BS 1192 part5, a simplyfied adaptation of the ISO standard based on CI/SfB, very common in UK;
  • AEC(UK), an adaptation of BS1192 based on Uniclass.

Samples of standardised layers:

A-B374--E- (ISO13567: agent Architect, element Roof window in SfB, presentation graphic element); A-37420-T2N01B113B23pro (ISO13567: agent Architect, element Roof Window in SfB, presentation Text#2, New part, floor 01, block B1, phase 1, projection 3D, scale 1:5(B), work package 23 and user definition "pro"); A-G25---D-R (ISO13567: agent Architect, element wall in Uniclass, presentation dimensions, status Existing to be removed); A-G251-G-WallExtl-Fwd (AEC(UK): agent Architect, element External Wall in Uniclass, presentation graphic element, user definition "WallExtl" and view Forward); A210_M_ExtWall (BS1192: agent Architect, element External Wall in SfB, presentation model, user definition "ExtWall"); A-WALL-FULL (AIA: agent Architect, element Wall, Full height).

[edit] Line Thickness

Thickness for pens and plot: 0,13mm, 0,18mm, 0,25mm, 0,35mm, 0,50mm, 0,70mm, 1,00mm. In AutoCAD usually parts to be printed in black are drawn in 1 to 7 basic colors.

[edit] Text and dimension

Heights: 1,8 mm, 2,5 mm, 3,5 mm, 5,0 mm, 7,0 mm (relative thickness are 1/10 of the heights). Font styles: "Romans", "ISO CP". Exceptional use of true type fonts (arial, etc.).

[edit] Scales

1:1, 1:2, 1:5, 1:10, 1:20, 1:50, 1:100, 1:200, 1:500, 1:1000, 1:2000, 1:5000, 1:10000, 1:20000, 1:50000 and so on.

[edit] File Naming Standards

  • BS 1192:

Discipline (1 char), Element (2 char, using SfB Table 1 or Uniclass), Drawing type (1 char, P=preliminary, X=special/xref, L=layout, C=component, S=schedules, A=assemby drawings, K=co-ordination drawing), Unique number (3 char), Revision (1 char, A=emission, B,C,D...= revisions). Samples: A22P012G.dwg (architect, internal walls in SfB, preliminary design, sheet 012, revision G).

Samples: ZE1G-124.dwg, XE1G-100.dwg

  • AEC(UK)

Project (unlimited char), Discipline (2 char max, recommended mandatory), Zone (optional), View (1 char, rec.mand.), Level (2 char, rec.mand.), Content (rec.mand.), Sequential number (up to 3 char); Samples: 1234-A-Off-P-M1-Furn-11c.dwg (project #1234, architect, office zone, plan, mezzanine 1, furnitures, version 1.1 revision c) , A-P-01-Part (architect, plan, 1st floor, partitions), 1234-A-S-055.dgn (project #1234, architect, section, sheet 055), A-S-xx-AA.dwg (architect, section, full building, section AA), A-P-x-Grid.dgn (architect, plan, all floor, grid), 1838-S-C-P-03 (project 1838, structures, building C, plan, 3rd floor).

  • Other local:

Job number(4 char), Agent (1 char), Section (4 char), phase (1 char), sheet number (2 char), revision (2 char) Samples: 0512-A-00A_-1-01-02.dwg Job number (3 char), View (2 char), section (2char), phase (1 char), revision (1 char) Samples: 123p0s2d0.dwg (job 1239, plan, 2nd floor, definitive drawing, emission), 459s0BBD0.dgn (job 123, section B, definitive drawing, emission).

[edit] MCAD (Mechanical) Standards

[edit] Geometric Dimensioning and Tolerancing

Industry standards for defining PMI, a 3D extension of GD&T, include ASME Y14.41 Product Data Definition and ISO 1101 Representation of specifications in the form of a 3D model.

[edit] Geometry Quality

VDA 4955

[edit] Product Data Quality

PDQ is a field of PLM relating to the quality of product data, particularly the geometrical and organizational quality of CAD data. Checkers, software that analyze CAD data formats, are often employed before and after data translation. The checkers can check the organization and quality of the data against internal company standards and international or industry standards. These checkers can be built into specific CAD packages or work on a number of CAD file formats.

In 2006/2007 Part 59 of STEP ISO 10303-59 Product data representation and exchange: Integrated generic resource: Quality of product shape data is under development. It defines how to represent quality criteria together with measurement requirements and representation of inspection results.

[edit] See also

  • UniClass
  • ISO Standards Handbook - Technical drawings, a broad collection of all basic ISO drawing standards
  • ISO 13567 Technical product documentation - Organization and naming of layers for CAD
  • ISO 16792 Technical product documentation — Digital product definition data practices, for the presentation of 3D models and GD&T
  • Engineering National CAD Standard with Autodesk
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