CAD layer standards

Most common:

• BS 1192, which relies heavily on the Code of Procedure for the Construction Industry
• AIA Cad Layer Guidelines, 2nd edition (1997), has a great usage in the USA;
• ISO 13567-1/3, International standard, common in Northern Europe;
• AEC (UK), an adaptation of BS-1192 based on Uniclass.
• A/E/C CAD Standard, Tri-service (USACE/Air Force/NAVFAC) CAD standard created/maintained by the CAD/BIM Technology Center for Facilities, Infrastructure, and Environment…^[1]
• SIA 2014 (1996), Swiss standard for engineers and architects, based on ISO 13567.
• ÖNORM A 6240-4 (2012), Austrian standard for digital documentation in technical drawings, based on ISO 13567.

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-E04---E- (ISO13567 SIA 2014: agent Architect, element Stair in SIA classification, presentation graphic element);

A-WALL-FULL (AIA: agent Architect, element Wall, Full height).

Line-thickness

Thickness for pens and plot: 0.13 mm Gray, 0.18 mm Red, 0.25 mm White, 0.35 mm Yellow, 0.50 mm Magenta, 0.70 mm Blue, 1.00 mm Green. In AutoCAD usually parts to be printed in black are drawn in 1 to 7 basic colors. Color layer: Green-Center, Magenta-Measure of length and Blue-Hidden.

Text and dimension

Heights: 2.5 mm, 3.5 mm, 5.0 mm, 7.0 mm (stroke thickness (lineweight) should be 0.1 of the character height). Font styles: "Romans.shx – Romantic Simplex", "ISOCPEUR.ttf". Exceptional use of screen fonts (arial, Times New Roman etc.).

Scales

• 2:1, 20:1, 200:1 ...
• 1:1, 1:10, 1:100 ...
• 3⁄16 in = 1 ft
• 1⁄4 in = 1 ft
• 3⁄8 in = 1 ft
• 1⁄2 in = 1 ft
• 3⁄4 in = 1 ft
• 1 in = 1 ft
• 1+1⁄2 in = 1 ft
• 3 in = 1 ft (QUARTER SCALE)
• 6 in = 1 ft (HALF SCALE)
• 1 ft = 1 ft (FULL SCALE)

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=assembly 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).

• AIA
• AEC

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). it produces a large number of photos that could then be CAD into a file format

Model-based definition

Model-based definition (MBD) is a method of product specification using elements within 3D models as defined by ASME Y14.41-2012. ASME Y14.41-2012 is based upon ASME Y14.5-2009 symbols and definition methods, such as Geometry Dimensioning and Tolerancing (GD&T).

Subscribers of International Organization for Standardization (ISO) have the standards ISO 1101 and ISO 16792 for model-based definition.

Geometry quality

VDA 4955