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Interview Question

Mechanical Design Engineer Interview(Student Candidate) Haliyal

angle of projections & drawing of iso views of given objects

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Interview Answer

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Interview Candidate on 16-Aug-2012
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An isometric view of an object can be obtained by choosing the viewing direction such that the angles between the projections of the x, y, and z axes are all the same, or 120°. For example, with a cube, this is done by first looking straight towards one face. Next, the cube is rotated ±45° about the vertical axis, followed by a rotation of approximately ±35.264° (precisely arcsin 1⁄√3 or arctan 1⁄√2, which is related to the Magic angle) about the horizontal axis. Note that with the cube (see image) the perimeter of the resulting 2D drawing is a perfect regular hexagon: all the black lines have equal length and all the cube's faces are the same area. Isometric graph paper can be placed under a normal piece of drawing paper to help achieve the effect without calculation.

MRIDULESH on 30-Sep-2016

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