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Drafting Standards and the Genium Drafting Manual

ASME Y14.100-2004, Engineering Drawing Practices

The ASME Y14.100 standard establishes engineering drawing practices and ties together the engineering drawing and related documentation practices in the Y14 series. This Standard is not a stand-alone document but a composite set containing ASME Y14.100, ASME Y14.24, ASME Y14.34M, and ASME Y14.35M. The initial rational for this Standard was to convert MIL-STD-100G to a non-government standard for engineering drawing practices that could be used in Government contracts. ASME Y14.100 is in accordance with the Acquisition Reform Policy Memo 98-2 and MIL-DTL-31000 which is used for preparing contractual requirements established by Technical Data Packages (TDP). It is applicable where commercial standards are to be used instead of military standards in Government contracts.

This Standard supersedes ASME Y14.100-2000, and ASME Y14.100M-1998, which consisted of basic practices common to MIL-STD-100G. Unfortunately this resulted in two basic drawing practices standards (ASME Y14.100 and MIL-STD-100). The user community was confused. They did not know which standard to use either as a stand-alone or in combination with the other standard. The consensus was that one standard was needed to improve standardization and harmonize practices and methodology between industry and government. This Standard contains appendices that may be invoked and tailored, thereby making possible the cancellation of MIL-STD-100, resulting in a single standard for engineering drawings documentation, form, and structure.

It is not the intent of this Standard to prevent individual organizations from designing specific drawing practices that meet their individual needs, but rather to provide common engineering delineation standards to aid the increasing interchange of drawings among industry, government, and other users. It is well recognized that individual companies have many detailed requirements for their specific method of operation. Consequently, the minimum requirements set forth in this Standard provide flexibility in implementation. The appendices are intended for use by organizations that are not strictly commercial, however, nothing prevents commercial organizations from using the appendices and tailoring them as necessary to meet their own needs.

As might be expected with such a broad-based standard, it is covered in a number of places in the Genium Drafting Manual. If you are trying to learn all about this standard, the first place to start is section 1.4, "Introduction to Government/DoD/Commercial Drafting Requirements", which introduces you to the standard. Then read the following two sections:

1.4.1 "Government/DoD Engineering Drawing Practices - Commercial (Not Requiring Government Waivers)"
1.4.2 "Government/DoD Engineering Drawing Practices - Non-commercial (Requiring Government Waivers)"

These two sections split the standard into its essential elements, commercial work and non-commercial work. The standard itself mixes these two elements, making it more difficult to understand than the way it is treated in the Genium Drafting Manual.

Other sections of the Genium Drafting Manual look at specifics associated with this standard. Their greatest value is clarifying the often complex requirements, wordiness, and jargon associated with military and government projects. Drafting Manual sections that address key elements of this standard are:

1.4.3 "Government/DoD Engineering Drawing Practices - Government and Commercial Standards and Specifications for Engineering Drawings"
1.4.4 "Government/DoD Engineering Drawing Practices - DoD Memo 98-2 ‘Specification and Standards - A New Way of Doing Business’"
1.4.5 "Government/DoD Engineering Drawing Practices - Waiver Process Overview"
1.4.6 "Government/DoD Engineering Drawing Practices - Application Data"
1.4.7 "Government/DoD Engineering Drawing Practices - Technical Data Package (MIL-DTL-31000)"
4.2 "Drawing Number and Part Identification"
4.8 "Drawing Titles"
7 "Notes on Drawings"
19 "Software Documentation"

Literally ASME Y14.100 is a storehouse of drafting elements because of all things referenced in the Standard and its appendices. Some of the drafting elements referenced in this Standard are:

  • (a) Abbreviations (ASME Y14.38)
  • (b) Acronyms for special items and processes
  • (c) Aircraft hydraulic and pneumatic system symbols (SAE AS 1290)
  • (d) Alternative or optional designs
  • (e) Application of "NEXT ASSEMBLY"
  • (f) Application of "USED ON"
  • (g) Approval, drawing
  • (h) Associated list (ASME Y14.34M)
  • (i) Bulk items identification
  • (j) CAGE or CAGEC Code
  • (k) Casting and forging (ASME Y14.8M)
  • (l) Changes requiring new and not new identification
  • (m) Common used words and phrases (shall will, should, and may)
  • (n) Computer programs
  • (o) Data preparation, maintenance, delivery, or access
  • (p) Dating, drawing
  • (q) Definition of Government drafting terminologies
  • (r) Digital data
  • (s) Dimensioning and tolerancing (ASME Y14.5M)
  • (t) Distribution statements
  • (u) Duplicate original
  • (v) Electrical and electronic diagram symbols (IEEE 315 and IEEE 315a)
  • (w) Electrical and electronic reference designations (IEEE 200, IEEE 315 and IEEE 315a)
  • (x) Find numbers
  • (y) Flowchart diagram symbols (ANSI/AIIM MS4)
  • (z) Fluid power diagram symbols (ANSI Y32.10)
  • (aa) Gears (ANSI Y14.7.1 and ANSI Y14.7.2)
  • (bb) Hardness critical note
  • (cc) Identification of materials, processes and protective treatment
  • (dd) Inseparable assembly
  • (ee) Interchangeable and non-interchangeable drawings
  • (ff) Isometric and pictorial views (ASME Y14.4M)
  • (gg) Language (English)
  • (hh) Letters that shall not be used
  • (ii) Letter symbols (ANSI/IEEE 260.1 and ANSI/IEEE 280)
  • (jj) Line and lettering convention (ASME Y14.2M)
  • (kk) Logic function symbols (IEEE 91 and IEEE 91a)
  • (ll) Logic circuit diagrams (ANSI/IEEE 991)
  • (mm) Marking, identification
  • (nn) Matched part designation
  • (oo) Mathematical signs and symbols (ANSI/IEEE 260.3)
  • (pp) Mechanical and piping symbols (ASTM F 1000, ASTM F 856, or ASME Y32.2.6)
  • (qq) Mechanical springs (ANSI Y14.13M)
  • (rr) Metric practices
  • (ss) Non-destructive welding testing symbols (ANSI/AWS A2.4)
  • (tt) Notes, drawing
  • (uu) Numbering, coding, and identification
  • (vv) Optical elements and systems (ASME/ANSI Y14.18M)
  • (ww) Ozone-depleting chemicals note
  • (xx) Part identifying number (PIN) and length
  • (yy) Preparation of duplicate original
  • (zz) Printed boards (IPC D-325, IPC D-350, and IPC 2221 and MIL-STD-1285)
  • (aaa) Projection system (ASME Y14.3)
  • (bbb) Reference identifier
  • (ccc) Related standards used in the drafting documentation
  • (ddd) Revisions of engineering drawings and associated lists (ASME Y14.35M)
  • (eee) Rights of data
  • (fff) Scale, drawing
  • (ggg) Screw thread representation (ASME Y14.6)
  • (hhh) Ship structural symbols
  • (iii) Single, multiple, and sectional view drawings (ASME Y14.3)
  • (jjj) Size and format of drawings (ASME Y14.1M for metric and ASME Y14.1 for decimal inch)
  • (kkk) Specification and standard, use of
  • (lll) Standardized Microcircuit Drawings (SMD)
  • (mmm) Surface texture symbols (ASME Y14.36M)
  • (nnn) Superseded drawings
  • (ooo) Symmetrically opposite (mirrored) parts
  • (ppp) Tailoring for Government drawings
  • (qqq) Titles, drawing
  • (rrr) Types and application of engineering drawings (ASME Y14.24)
  • (sss) Vendor control and source control drawing reference note
  • (ttt) Welding symbols (ANSI/AWS A2.4 and ANSI/AWS A3.0 for definitions)
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