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  2. Engineering drawing - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing

    With linear dimensions, two parallel lines, called "extension lines," spaced at the distance between two features, are shown at each of the features. 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.

  3. 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.

  4. 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.

  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. 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.

  9. ASME Y14.5 - Wikipedia

    en.wikipedia.org/wiki/ASME_Y14.5

    ASME Y14.5 is a complete definition of Geometric Dimensioning and Tolerancing. It contains 15 sections which cover symbols and datums as well as tolerances of form, orientation, position, profile and runout. [3] It is complemented by ASME Y14.5.1 - Mathematical Definition of Dimensioning and Tolerancing Principles.