MIL-D-28000
Class I - Technical Illustrations

3.2.1. Class I subset - technical illustrations. The Technical Illustration subset of ASME Y14.26M addresses entities that support the exchange of figures and illustrations normally found in a technical publication. In this application, emphasis is on visual clarity of figures and illustrations designed for human interpretation. The IGES Technical Illustrations Application Guide provides additional guidance on this usage of IGES.

3.2.1.1. Information requirements and data functionality. Two dimensional geometry and text annotation form the majority of data items although some non-geometric information is required as well. Information requirements for this application subset include (but are not limited to):

  1. Simple two dimensional geometry in the form of lines, circular arcs, conic arcs, and spline curves.
  2. Non-geometric attributes of line weight and line font.
  3. Text annotation.
  4. Data relationships, including the concept of subfigures.
3.2.1.2. ASME Y14.26M entity subset specification. Table I lists the entities of this subset. Only ASME Y14.26M entities which are enumerated in this table shall be used for representing technical publication illustration product definition data. Other valid ASME Y14.26M entity types may be present in the file as described by 3.1.1. Additional requirements are placed on the Global Section of a file, and certain field value restrictions are also placed on the range of parameter values in both the directory entry (DE) and the parameter data (PD) sections of a valid ASME Y14.26M file.

TABLE I. - ASME Y14.26M entity content of technical illustration subset

When the form column in Table I is blank for an entity which has multiple form numbers, all forms of that entity are included in the subset.

TYPE FORM ENTITY NAME
0 0 Null entity
100 0 Circular arc
102 0 Composite curve
104 1 Conic arc - ellipse
104 2 Conic arc - hyperbola
104 3 Conic arc - parabola
106 11 Copious data - Piecewise planar, linear string (2D linear path)
106 63 Simple closed planar curve
110 0 Line
112 0 Parametric spline curve
124 0 Transformation matrix
126 0 Rational B-spline curve
126 1 Rational B-spline curve - Line
126 2 Rational B-spline curve - Circular arc
126 3 Rational B-spline curve - Elliptical arc
126 4 Rational B-spline curve - Parabolic arc
126 5 Rational B-spline curve - Hyperbolic arc
212 0 General note
212 1 General note - dual-stack dimension
212 2 General note - imbedded font change dimension
212 3 General note - superscripted dimension
212 4 General note - subscripted dimension
212 5 General note - superscripted/subscripted dimension
212 6 General note - multiple stack - left justified
212 7 General note - multiple stack - center justified
212 8 General note - multiple stack - right justified
212 100 General note - simple fractional dimension
212 101 General note - dual stack fractional dimension
212 102 General note - imbedded font change/double fractional dimension
212 105 General note - super-/sub-scripted fractional dimension
230 0 Sectioned area (Standard Crosshatching)
230 1 Sectioned area (Inverted Crosshatching)
308 0 Subfigure definition
404 0 Drawing
406 15 Property - Name
406 16 Property - Drawing size
406 17 Property - Drawing units
406 18 Property - Intercharacter spacing
408 0 Single subfigure instance
410 0 View - Orthographic parallel
412 0 Rectangular subfigure instance
414 0 Circular subfigure instance
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