MAE%201004_Lecture%2006%20Sketching%20%5b2%5d-Spring%202011%20%5bCompatibility%20Mode%5d

MAE%201004_Lecture%2006%20Sketching%20%5b2%5d-Spring%202011%20%5bCompatibility%20Mode%5d

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Unformatted text preview: MAE 1004 MAE 1004 Hand in HW #1 now (at 3:45 pm) – specify now your lab section next to your name Today’s topics HW HW #2 (Sketching the multiview of an object) #2 (Sketching the multiview an object) Chapter 6 Sketching and Shape Description (continued) The “hidden line” lecture “hidd li 2/2/2011 1 MAE MAE 1004 HW #2 Freehand sketching - Due next Wednesday (Feb. 9) in class at 3:45 pm Sketch the multiview drawing Fig. 6.51 on page 191 (on a square graph paper) • Download graph paper at Blackboard (MAE 1004_10 > Files > Graph paper folder) Bl (MAE 1004 Fil Freehand sketch, do not use ruler do Page orientation: portrait Page orientation: portrait Must draw construction lines first and do not erase them Then use different pencils to sketch visible, center, & hidden lines Count grids carefully must use graph paper with grid size Count grids carefully – must use graph paper with grid size >= 0.2 inch 0.2 inch Correctness and position of views (Fig. 6.47) Line qualities will be evaluated Follow the guidelines described in Fig. 6.46 Put MAE 1004 HW #2, your name, your lab section (upper right corner) MAE your Any question, use Dr. Shen’s office hours Due next Wednesday (Feb. 9) in class (@3:45 pm) 2/2/2011 2 Use square graph paper Use square graph paper Free hand sketching (do not use ruler) Figure Figure 6.51 on page 191 on page 191 3 MAE 1004 HW #2, John Smith, Section 33 Page orientation: Portrait Page 1 of 1 4 HW #2 grading polic HW #2 grading policy 10% Page orientation (portrait) and ‘Name/lab section’ in upper-right corner er20% Construction lines 20% Line quality Lin lit 50% Correctness 5 HW HW #2 grading policy 10% Page orientation (portrait) and ‘Name/lab ‘Name/lab section’ in upper-right corner upper20% Construction lines 20% Line quality Line quality Must show; use pencil 1 (H or 2H); a dull pencil; light in darkness; do not erase them Use the right pencil for each type of lines Visible lines: one-stroke segments; no gap in between two segments one- 50% Correctness Size and location of the features (count grids accurately) Position of the views Position of the views 6 First set of construction lines (in red and blue – four rectangles) H W D Figure 6.51 on page 191 on page 191 7 Follow the steps shown below (I~V) Guidelines for sketching the object shown in Fig. 6.51: Draw construction lines, step by step (I~IV), and then finalize the views with visible lines, hidden lines, 8 and centerlines. Line Line qualities are important – will be evaluated in HW assignments and exams Draw construction lines first by using pencil 1 (H or construction 2H 2H pencil, a very dull pencil, no need to erase them) no Visible lines should be dark and thick (0.7 mm), use dark pencil 2 (B or 2B); complete in one-stroke segments; no one Hidden lines (thickness: 0.35 mm) – pencil 3 (HB or B) 4 mm dash, 1 mm gap Center lines (thickness: 0.3 mm) – pencil 4 (HB or B) li B) thin and dark; cross hair: dash (~5 mm) and gap (~2 mm) 9 II’ Use this “8-point” approach to sketch circles in this class. Practice! 10 11 Check: identify the same feature in different views (e.g., the hole shown below) Figure 6.51 on page 191 on page 191 12 Any questions about HW #2? HW #2? 13 MAE 1004 MAE 1004 Engineering Engineering Drawing and Computer Graphics Chapter 6 Sk Sketching and Shape Description Sh (continued) 15 1. Identify visible lines first 16 2. Identify hidden lines and center lines Identify hidden lines and center lines 1. Identify visible lines first 17 18 A. Visible lines in all views A. Visible lines in all views 19 A. Visible lines in all views lines in all views • Identify all visible lines • Questions? 20 B. Hidden lines (in all views) - Use dashes to represent a feature that is hidden (not visible) in a specific view 21 Rule #1: Use hidden lines to show a hole or groove, for example, the hole between right-side and left-side views 22 Rule #1: Use hidden lines to show a hole or groove 23 Rule #2: if visible lines in the opposite view, then hidden lines in this specific view, for example, visible lines in the front view => hidden lines in the rear view 24 Rule #2: if visible lines in the opposite view, then hidden lines in this specific view hidden lines in this specific view 25 C. Center lines (in all views) – used to indicate axes of symmetrical objects or features, bolt circles, & paths of motion 26 C. Center lines 1. Crossed center lines in the circular view 2. A single center line in the longitudinal view 2 1 1 2 2 2 27 Identify (1) visible lines, (2) hidden lines, and (3) center lines in each example/drawing 28 Line Line qualities are important – will be evaluated in HW assignments and exams Use construction lines first and the lines should be light construction light (use a dull pencil; no need to erase them) dull Visible lines should be dark and thick (thickness: 0.7 dark mm); complete in one-stroke segments; no gap one Hidden lines (thickness: 0.35 mm): dash (4 mm) and gap (1 mm); mm); Center lines (thickness: 0.3 mm): li thin and dark; dash (~5 mm) and gap (~2 mm); 29 Practice Practice Fr Freehand sketching of the followings: th 1. 2. 3. 4. A square; side = 2 grids A circle; diameter = 4 grids A square; side = 6 grids square; side grids A circle; diameter = 8 grids [need more than 8 arcs] On one graph paper Freehand sketch do not use ruler to draw Freehand sketch, do not use ruler to draw Must draw construction lines first and then draw visible lines (do not erase construction lines) Follow the guidelines described in Chapter 6 Ch II’ 30 ...
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