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All information missing from the drawing is to be pulled from a 3D model of the part or assembly. LH: left-hand: Referring to handedness, such as the helix handedness of screw threads or the mirror-image handedness of a symmetrical pair of parts. LM or L/M: list of materials: Also called a bill of materials (BoM, BOM).
A cutaway drawing is a technical illustration, in which part of the surface of a three-dimensional model is removed in order to show some of the model's interior in relation to its exterior. The purpose of a cutaway drawing is to "allow the viewer to have a look into an otherwise solid opaque object.
The assembly drawing gives the drawing numbers of the subsequent detailed components, quantities required, construction materials and possibly 3D images that can be used to locate individual items. Although mostly consisting of pictographic representations, abbreviations and symbols are used for brevity and additional textual explanations may ...
ISO 3098-1:1974 Technical Drawing — Lettering — Part I: Currently Used Characters; ISO 4172:1991 Technical drawings — Construction drawings — Drawings for the assembly of prefabricated structures; ISO 5261:1995 Technical drawings — Simplified representation of bars and profile sections; ISO 5455:1979 Technical drawings — Scales
ISO Standards Handbook – Technical drawings, a broad collection of all basic ISO drawing standards Vol.1 Technical drawings in general , ISBN 92-67-10370-9 Vol.2 Mechanical engineering drawings, construction drawings, drawing equipment , ISBN 92-67-10371-7
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Technical drawing with references and geometric specifications. A datum reference or just datum (plural: datums [Note 1]) is some geometrically important part of an object—such as a point, line, plane, hole, set of holes, or pair of surfaces—that serves as a reference in defining the geometry of the object and (often) in measuring aspects of the actual geometry to assess how closely they ...
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