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  2. Engineering drawing - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing

    A line perpendicular to the extension lines, called a "dimension line," with arrows at its endpoints, is shown between, and terminating at, the extension lines. The distance is indicated numerically at the midpoint of the dimension line, either adjacent to it, or in a gap provided for it.

  3. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    The issuance of a drawing from the engineering/design activity to the production activity. In other words, the event when a draft becomes a completed, official document. A stamp on the drawing saying "ISSUED" documents that RTP has occurred. RTV: room-temperature vulcanizing; return to vendor: 1. RTV sealants, a way to seal joints. 2.

  4. Geometric dimensioning and tolerancing - Wikipedia

    en.wikipedia.org/wiki/Geometric_dimensioning_and...

    Example of true position geometric control defined by basic dimensions and datum features. Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances via a symbolic language on engineering drawings and computer-generated 3D models that describes a physical object's nominal geometry and the permissible variation thereof.

  5. CAD standards - Wikipedia

    en.wikipedia.org/wiki/CAD_standards

    Dimension line Leader Line with Arrows 0.000 Gray Color-9, or 8, Red Text 0.18 or 0.20 ... Vol.2 Mechanical engineering drawings, construction drawings, ...

  6. ISO 128 - Wikipedia

    en.wikipedia.org/wiki/ISO_128

    ISO 128-25:1999 Technical drawings — General principles of presentation — Part 25: Lines on shipbuilding drawings Replaced by ISO 128-3:2022 ISO 128-30:2001 Technical drawings — General principles of presentation — Part 30: Basic conventions for views

  7. Technical drawing - Wikipedia

    en.wikipedia.org/wiki/Technical_drawing

    There are two types of computer-aided design systems used for the production of technical drawings: two dimensions ("2D") and three dimensions ("3D"). An example of a drawing drafted in AutoCAD. 2D CAD systems such as AutoCAD or MicroStation replace the paper drawing discipline. The lines, circles, arcs, and curves are created within the software.

  8. Reference dimension - Wikipedia

    en.wikipedia.org/wiki/Reference_Dimension

    A reference dimension is a dimension on an engineering drawing provided for information only. [1] Reference dimensions are provided for a variety of reasons and are often an accumulation of other dimensions that are defined elsewhere [2] (e.g. on the drawing or other related documentation). These dimensions may also be used for convenience to ...

  9. Isometric projection - Wikipedia

    en.wikipedia.org/wiki/Isometric_projection

    Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawings. It is an axonometric projection in which the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees.

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