Engineering Science 1050 Lecture Notes - Lecture 2: Multiview Orthographic Projection, Parallel Projection, Projection Plane

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Sketching quickly communicates design ideas: talking sketches informal communicating, thinking sketches help think creatively, prescriptive sketches document design ideas. 1: problem identification, preliminary ideas, preliminary design, refinement, modeling, design analysis, design visualization. Implementation: servicing, financing, marketing, producing, planning, documenting. Hidden lines do not cross or have priority over visible lines. Centre lines do not cross/have priority over visible or hidden lines: construction lines. Circles and ellipses require construction lines: use diagonals to proportion. Can produce drawings that show all 3 dimensions at once distort dimension and/or angles making fabrication difficult. Can also produce drawings that only show 2 dimensions. More than one drawing will be required to show all all dimensions. Multi-view drawings show true size and shape of the object parallel to projection plane: europe first angle projection not used here, north america third angle projection, multi-view projection true shape and size. Angles are correct, circles are round, lengths are too scale.

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