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Engineering drawing
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{{Short description|Type of technical drawing used to define requirements for engineered items}} {{Redirect|Engineering Drawing|the book by Thomas Ewing French|Engineering Drawing (textbook)}} {{Multiple issues| {{More citations needed|date=September 2009}} {{Essay-like|date=March 2025}} {{Overly detailed|date=March 2025}} {{How-to|date=March 2025}} }} [[File:DIN 69893 hsk 63a drawing.png|thumb|Engineering drawing of a [[machine tool]] part]] {{Technical drawings}}An '''engineering drawing''' is a type of [[technical drawing]] that is used to convey information about an object. A common use is to specify the geometry necessary for the construction of a component and is called a '''detail drawing'''. Usually, a number of drawings are necessary to completely specify even a simple component. These drawings are linked together by a "master drawing." This "master drawing" is more commonly known as an '''assembly drawing'''. 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, [[Engineering drawing abbreviations and symbols|abbreviations and symbols]] are used for brevity and additional textual explanations may also be provided to convey the necessary information. The process of producing engineering drawings is often referred to as [[technical drawing]] or '''drafting''' ('''draughting''').<ref name=":0">{{Cite book|title=Practical Engineering Drawing|last=M. Maitra|first=Gitin|publisher=New Age International (P) Limited, Publishers|year=2000|isbn=81-224-1176-2|location=4835/24, Ansari Road, Daryaganj, New Delhi - 110002|pages=2β5; 183}}</ref> Drawings typically contain [[multiview projection|multiple views]] of a component, although additional ''scratch views'' may be added of ''details'' for further explanation. Only the information that is a ''requirement'' is typically specified. Key information such as ''dimensions'' is usually only specified in one place on a drawing, avoiding redundancy and the possibility of inconsistency. Suitable [[Engineering tolerance|tolerances]] are given for critical dimensions to allow the component to be manufactured and function. More detailed [[production drawing]]s may be produced based on the information given in an engineering drawing. Drawings have an information box or ''title block'' containing who drew the drawing, who approved it, units of dimensions, meaning of views, the title of the drawing and the drawing number.
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