MAE%201004_Lecture%2004%20CAD-Spring%202011_02%20%5bCompatibility%20Mode%5d

MAE%201004_Lecture%2004%20CAD-Spring%202011_02%20%5bCompatibility%20Mode%5d

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Unformatted text preview: MAE 1004 MAE 1004 Hand in HW #4 Hand in HW #4 CAD Exam #1 – this week In your registered lab session; be punctual; no show = 0 Midterm exam on March 2 (Wed.) in class Today’s topics HW #3 solution Chapter 7 Multiview Projection (continued) Normal 2/23/2011 surfaces; inclined surfaces; oblique surfaces 1 AutoCAD Exam #1 – this week In your registered lab session; be punctual; no show = 0 Two problems; 100 minutes You can use the AutoCAD textbook in the exam; no borrowing AutoCAD book in the exam though Midt Midterm exam on March 2 (Wed.) in class (W (3:45 pm to 4:35 pm) in Duques 151 2/23/2011 Multiview drawing (like HW #3) and missing line (lik HW #3) li problems (like HW #4) Be punctual; 50 minute exam (time extension not possible) punctual; 50 minute exam (time extension not possible) 2 HW #3 – to be returned in the lab session this week Front View 3 1. 1. Primary visible lines visible lines 2. Secondary visible lines 3. Hidden lines 4. Center lines 4 1. Primary visible lines 2. Secondary visible lines 3. Hidden lines 4. Center lines 5 1. Primary visible lines 2. Secondary visible lines 3. Hidden lines (dash 4 mm, gap 1 mm) 4. Center lines 6 1. 1. Primary visible lines visible lines 2. Secondary visible lines 3. Hidden lines 4. Center lines Show crosshair 7 Check list for the drawing in HW #3 Check list for the drawing in HW #3 Correctness – do not miss visible lines, hidden lines, and center lines – major penalty on missing lines. Line qualities are important – will be evaluated in HW assignments and exams. Use the right pencil; uniform line thickness. Use construction lines and the lines should be light (use dull Use construction lines and the lines should be light (use a dull pencil pencil; no need to erase them) Visible lines should be dark and thick (0.7 mm); uniform line dark thickness. hi Hidden lines (thickness: 0.35 mm): “no gap” with visible lines (unless the dash forms a continuation of a visible line) dash (4 mm) and gap (1 mm) Center lines (thickness: 0.3 mm): thin and dark; show cross hair in one view dash thin and dark; show cross hair in one view - dash (~5 mm) and gap (~2 mm) mm) and gap mm 8 Multiview Multiview drawing problem 3 4 inclined surface Rear view 4 4 2 1 3 2 14 7 (6+1) Front View 9 10 11 MAE 1004 MAE 1004 Engineering Drawing and Engineering Drawing and Computer Computer Graphics Chapter 7 Multiview Projection 12 13 Make sure that every line makes sense 14 Drawing/sketching technique: proper HL – dash 4 mm, gap 1 mm; HL gap or no gap; joined dashed; … 15 16 17 Inclined surface – the angle of cut can be clearly identified from one1view 8 19 Use Miter line to drawing the hidden line 20 21 Inclined surface – the angle of cut can be clearly identified from one 2view 2 30 32 31 23 Oblique Surface Oblique Surface 24 25 Missing line practice problem in HW #4? 26 Missing line practice problem in HW #4 27 1. Primary visible lines 2. Secondary visible lines 3. Hidden lines li 28 1. Primary visible lines 2. Secondary visible lines 3. Hidden lines li Use ruler to drawing vertical and horizontal construction lines when analyzing a multiview drawing. How about the miter line? 29 Use ruler to drawing vertical and horizontal construction lines when analyzing a multiview drawing. How about the miter line? 30 Study/analyze sample multiview drawings in in Chapter 7 Verify Verify - all the lines shown make sense (VL, HL, CL) all the lines shown make sense HL CL Use different pencils: pencils: VL VL – thick (0.7 mm) and dark (0 HL (0.35 mm thickness) – dash: 4 mm; gap: 1 mm; usually no gap; when to leave gap? usually no gap; when to leave a gap? CL (0.3 mm thickness) – dash: 5 mm; gap: 2 mm Use proper drawing techniques (e.g., ‘L’ and “T” ‘L’ “T” when when hidden lines join) Questions? Use Prof. Shen’s office hours 31 Multiview Multiview drawing problem 3 4 inclined surface Rear view 4 4 2 1 3 2 14 7 (6+1) Front View 32 33 34 ...
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