Concordia University Mechanical Engineering Drawing Mechanical - - PowerPoint PPT Presentation

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Concordia University Mechanical Engineering Drawing Mechanical - - PowerPoint PPT Presentation

Jul 22, 2023 691 likes •967 views

Concordia University Mechanical Engineering Drawing Mechanical Engineering Drawing MECH 211/M Lecture #2; Chapters 2, 3 and 4 ; p , Dr. John Cheung Last lecture summary Last lecture summary Third angle projection Third angle projection.

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Concordia University Mechanical Engineering Drawing Mechanical Engineering Drawing MECH 211/M

Lecture #2; Chapters 2, 3 and 4 ; p ,

  • Dr. John Cheung
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Last lecture summary Last lecture summary

  • Third angle projection

Third angle projection.

  • Multi‐view projection.

i li ldi li

  • 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 Quiz Rounds, Fillets & Runouts

Question: Match the multi-view images with the sketches below.

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Quiz Quiz Rounds, Fillets & Runouts

Question: Question: Match the multiview images with the sketches below below. Answers: a) f ) b) c c) e d) b d) b e) d f) g g) a

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Chapter 2 Chapter 2 CAD Systems

Any Questions?

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Drawings Must Be

Accurate Speed Speed Legibility

N

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.

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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 Parallel Lines Through a Point

Given line AB and Point P. This is more accurate. The method on

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the right is faster.

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Parallel Lines Parallel Lines at a Given Distance

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Dividing a Line Dividing a Line Into Equal Parts

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Perpendicular Line Perpendicular Line Through a Point

Given three points P, E and

  • D. To draw a circle.

Given line A‐B and Point P, draw line from Point P Given line A‐B and Point P, draw perpendicular line

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draw line from Point P perpendicular to line A‐B. p p from Point P.

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Drawing radius in acute angle

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Drawing arc tangent to two arcs 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 ( p lines/arcs and not dots) – chord length of circle.

Find a circle that passes through all three

points 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) 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 Choose an arbitrary point P outside but

near the circle Choose an arbitrary radius R

Choose an arbitrary radius R Find the circle that passes through P with a

di R d i h fi i l radius R and is tangent to the first circle

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