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lecture2 - MECH 220 Intro to Engineering CAD Orthographic...

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1 Inst. Charbel Seif, MECH 220 10/11/2005 1 MECH 220 MECH 220 Intro to Engineering CAD Intro to Engineering CAD Orthographic Drawing Orthographic Drawing FALL 2006-07 Instructor: Charbel Seif Office: Wing B - B-303 Extension: 3629 e-mail: [email protected]
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2 Inst. Charbel Seif, MECH 220 10/11/2005 2 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE Topics Topics r Overview r Available Convention r Orthographic Projection r Transferring Dimensions r Drawing Curved Shapes r Selecting Views r Geometric Entities Representation r Sketching Exercise
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3 Inst. Charbel Seif, MECH 220 10/11/2005 3 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE MECHANICAL DRAWINGS: MECHANICAL DRAWINGS: plotting area’s contents plotting area’s contents GENERAL FITTING PROJECT AUB ENGINEERING MATERIAL: MILD STEEL NOTES: 1. DIMENSIONS ARE IN INCHES. 2. OBSERVE TOLERANCES ON MAIN BLOCK UNLESS OTHERWISE SPECIFIED. PLOTTING AREA
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4 Inst. Charbel Seif, MECH 220 10/11/2005 4 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE History History r Orthographic Projection was formalized by Gaspard Mongne (b. 1746). r Mongne worked as a drafter in the fortification design office of the school at Mezier for French army officers r His work was kept a military secret for a number of years until he was allowed to publish in 1795. r Stone cutters were the first to adopt his methods. Later carpenters and other trades abandoned their old methods for orthographic projection.
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5 Inst. Charbel Seif, MECH 220 10/11/2005 5 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE Orthographic Projection Orthographic Projection r Is the backbone of technical drafting r A system of drawing views using perpendicular projectors from the object to a plane of projection r Views are generated using the flat planes
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6 Inst. Charbel Seif, MECH 220 10/11/2005 6 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE Revolving an Object to Produce the Six Basic Revolving an Object to Produce the Six Basic Views Views
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7 Inst. Charbel Seif, MECH 220 10/11/2005 7 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE ORTHO VIEWS ORTHO VIEWS Available Convention
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8 Inst. Charbel Seif, MECH 220 10/11/2005 8 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE ORTHO VIEWS ORTHO VIEWS Third Angle Convention Third Angle Convention r Third angle convention is used mainly in Canada and US for views alignment. r The object is rotated by using the corner where the view is located as a hinge corner
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9 Inst. Charbel Seif, MECH 220 10/11/2005 9 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE ORTHO VIEWS ORTHO VIEWS First Angle Convention First Angle Convention r The object is rotated by using the corner opposite where the view is located as a hinge corner
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10 Inst. Charbel Seif, MECH 220 10/11/2005 10 MECH 220: 2nd LECTURE MECH 220: 2nd LECTURE ORTHO VIEWS: ORTHO VIEWS: Third Angle Convention Versus First Angle Convention Third Angle Convention Versus First Angle Convention r Universal symbols are used to identify which format being used r Combining the two systems in the same drawing is a major mistake
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lecture2 - MECH 220 Intro to Engineering CAD Orthographic...

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