Engineering Drawing
An Engineering Drawing is a Document that communicates a precise description of a part. This description consists of pictures, words, numbers and symbols. Together, these elements communicate part information to all drawing users.
Engineering drawing information includes:
Geometry (shape, size, and form of the part)
Critical functional relationships
Tolerances allowed for proper function
Material, heat treat, surface coatings
Part documentation information (part number, revision level)
In the past most engineering drawings were created by manual methods. Tools like drafting boards, T-squares, compasses, triangles, etc. were used. The original drawing was created on paper, vellum or Mylar that could be used for making blueprints.
Today engineers created drawings using a computer. The designer creates an electronic version of a drawing. The original drawing is a computer file. Copies are made on a printer or plotter. Whether engineering drawings are manual drawings or computer generated their purpose remains the same: to record and communicate design information.
SCALES are one of the part of engineering drawing
Usually the word scale is used for an instrument used for drawing straight lines. But actually in Engineer’s language scale means the proportion or ratio between the dimensions adopted for the drawing and the corresponding dimensions of the object. It can be indicated in two different ways. Example: The actual dimensions of the room say 10m x 8m cannot be adopted on the drawing. In suitable proportion the dimensions should be reduced in order to adopt conveniently on the drawing sheet. If the room is represented by a rectangle of 10cm x 8cm size on the drawing sheet that means the actual size is reduced by 100 times.
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