By E. Tjalve, M. M. Andreasen and F. Frackmann Schmidt (Auth.)
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Additional info for Engineering Graphic Modelling. A Workbook for Design Engineers
The basic concept of representing a vector by components parallel t o the Cartesian axes is shown below. • Ο Ο • ο ο ο ο · • ο · · · ο Vectors having magnitudes of unity and denoted[,[, k represent the directions of the axes X , Y , Z . A vector is then represented as • · ο · · ο ο ο ο ·> · · ο ο • ο οοο · R = a/ + bj + ck where a, b and c are the magnitudes of the vector components. This form of vector representation makes possible standard algebraic vector manipulations and simplifies the description of certain graphical forms.
Vectors having magnitudes of unity and denoted[,[, k represent the directions of the axes X , Y , Z . A vector is then represented as • · ο · · ο ο ο ο ·> · · ο ο • ο οοο · R = a/ + bj + ck where a, b and c are the magnitudes of the vector components. This form of vector representation makes possible standard algebraic vector manipulations and simplifies the description of certain graphical forms. 2 SYMBOLS THE DRAWING CODE A symbol is a notation or simplified picture with a specific meaning.
E. a given point on the object is represented by a given point on the paper, this transfer being according to set rules. 8 Orthographic Isometric Dimetric 'Pictorial' projections Trimetric Oblique Single-point perspective Two-point perspective Three-point perspective θ e THIRD ANGLE FIRST ANGLE PERSPECTIVE In addition non-conventional representations may be used particularly when freehand sketching, which become a subconscious mixing of the different types of projection. This is possible because of the similarity between the construction rules, in some cases these are the same.