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Concordia University Mechanical Engineering Drawing MECH 211/M
Lecture #2; Chapters 2, 3 and 4 Dr. John Cheung
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Last lecture summary Third angle projection. Multi-view projection.
Miter line. Folding line. Inclined plane. Oblique plane. Foreshortened length. True length. True surface. Revolution of features – Minimize hidden lines - less ambiguous.
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Quiz Rounds, Fillets & Runouts
Question: Match the multi-view images with the sketches below.
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Quiz Rounds, Fillets & Runouts
Question: Match the multiview images with the sketches below. Answers: a) f b) c c) e d) b e) d f) g g) a
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Chapter 2 CAD Systems Any Questions?
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Drawings Must Be Accurate Speed Legibility Neatness
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Alphabet of Lines
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Alphabet of Lines
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Alphabet of Lines
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Keeping a Sharp Edge
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The Good and The Bad
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Lettering
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Fractions
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Bisecting A Line or Arc Draw an arc using point A somewhere close to the line centre but above and below the line. Repeat for Point B and must use the same arc length. Connect the two intersection points.
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Bisecting an Angle
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Transfer an Angle Line A’-B’ can be anywhere.
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Parallel Lines Through a Point
Given line AB and Point P. This is more accurate. The method on the right is faster.
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Parallel Lines at a Given Distance
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Dividing a Line Into Equal Parts
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Perpendicular Line Through a Point
Given three points P, E and D. To draw a circle. Given line A-B and Point P, draw perpendicular line from Point P. Given line A-B and Point P, draw line from Point P perpendicular to line A-B.
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Drawing radius in acute angle
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Drawing arc tangent to two arcs
Largest Radius = r + R or r - R
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In Class Exercises Create three arbitrary points but ensure not in a line (remember points are crossed lines/arcs and not dots) – chord length of circle. Find a circle that passes through all three points Explain WHY your method works
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In Class Exercise Draw a hexagon – say M20x2.5; width across flat = 30mm. Using the enlarging technique in 4.27 to scale it to double its size (2 times).
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In Class Exercise Draw an arbitrary circle of radius G
Choose an arbitrary point P outside but near the circle Choose an arbitrary radius R Find the circle that passes through P with a radius R and is tangent to the first circle
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