MAE%201004_Lecture%2008_02%20Sketching%20%5b4%5d-Spring%202011%20%5bCompatibility%20Mode%5d

MAE%201004_Lecture%2008_02%20Sketching%20%5b4%5d-Spring%202011%20%5bCompatibility%20Mode%5d

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Unformatted text preview: MAE MAE 1004 Hand in HW #2 After 3:47 pm HW #2 will not be accepted unless note with the After 3:47 pm, HW #2 will not be accepted unless a note with the reason(s) reason(s) is attached to the assignment Missing a lab will receive a ‘0’ on the corresponding Missin lab on assignment Final Exam: May 4 (Wed.), 5:20 – 7:20 pm, Duques 151 May pm, Today’s topics 2/9/2011 HW #3 (Multiview sketching) #3 sketching) Chapter 6 Sketching and Shape Description (continued) (continued) The “two-view or three-view” lecture two or three lecture 1 Missing a lab will receive a ‘0’ on the corresponding assignment di If you have a legitimate reason, please email the TA TAs (and copy Prof. Shen) – if the reason is Sh if accepted, you’ll receive full credit for the lab assignment (excused absence) assignment (excused absence) MAE 1004 Final Exam: May 4 (Wed.), 5:20 – 7:20 pm, Duques 151 * Spring 2011 final exam schedule at myGW – check all your final exams 2 MAE MAE 1004 HW #3 Multiview drawing problem (on one square graph paper) Fig. 6.52: Object 2 on page 192 of the first textbook page Sketch three views (front, top, and right-side views) of each object – the top and the position position of the three views should be correct; Use the shown Front View definition Use graph paper (from Blackboard or your own) Must use graph paper with grid size >= 0.2 inch USE RULER to draw all lines except the circle; use ‘the 8 point method’ to to sketch the circle On the problems in Fig. 6.52: one large grid equals to two small grids. th Fi one id equa ll Count Count the number of grids of each feature to determine its size/location – use ruler to help with the measurements. Drawing construction lines first; do not erase them Must show all visible lines, hidden lines, and centerlines properly Put HW #3, your name and lab section on the first page. Staple on Staple Use Dr. Shen’s office hours if you have any questions Due next Wed. (Feb. 16) in class (@3:45 pm) 2/9/2011 3 Front View 4 Use graph paper & follow the steps to sketch the required 3 views for each object. I: draw the ‘4 rectangles’ using construction lines (counting grids, align views); II II: draw construction lines for ‘primary’ visible lines (visualize the views); li li th III & IV: draw construction lines for “secondary” (more detailed) visible lines and then draw construction lines for hidden lines and centerlines; V: finalize the three views with the right pencils for visible lines, hidden lines, li hidd li and centerlines. 5 HW #3 grading policy HW #3 grading policy Page orientation: portrait; name/lab sec. in the upper right corner (5%) Four (4) rectangles in construction lines (15%, Four (4) rectangles in construction lines (15%, including including quality of construction lines and correct position of the views) Include all visible lines? (30%) Line quality (10%) Include all hidden lines? (15%) Line quality (5%) Include all centerlines? (15%) Line quality (5%) (15%) Lin (5%) * Start today or tomorrow; do not copy Start today or tomorrow; do not copy 6 MAE 1004 HW #3, John Smith, Section 33 Page orientation: Portrait (Top) (Front) (R-S) 7 Check list for HW #3 drawings list for HW #3 drawings Correctness – do not miss visible lines, hidden lines, and center lines – major penalty on missing lines. Use Dr. Shen’s office hours if you have questions have questions Line qualities are important – will be evaluated in HW assignments and exams Use construction lines and the lines should be light (use a dull construction pencil pencil; no need to erase them) Visible lines should be dark and thick (0.7 mm); complete in onelines should be dark and thick (0.7 mm); complete in one stroke segments Hidden lines (thickness: 0.35 mm): “no gap” with visible lines (unless the dash forms a continuation of a visible line); li th li dash (4 mm) and gap (1 mm) Center lines (thickness: 0.3 mm): thin and dark; show cross hair in one view - dash (~5 mm) and gap (~2 mm); 8 Visualize the three views: front, top, and right-side 9 10 11 12 MAE 1004 MAE 1004 Engineering Engineering Drawing and Computer Graphics Chapter 6 Sk Sketching and Shape Description Sh (continued) (1) When to draw hidden lines? (4 mm dash, 1 mm gap) (2) (2) How to draw hidden lines correctly? hidd li 14 Center line: 5 mm dash, 2 mm gap ~ 8mm extension outside the feature for which they are drawn 8mm extension outside the feature for which they are drawn 15 Need all six view? Three views? Two views? 16 17 18 19 20 How about keeping the Left-Side View (and deleting the Right-Side View)? 21 22 23 24 25 26 1. Create construction lines for ‘visible lines’ 2. Create construction lines for ‘hidden lines’ and ‘center lines’ construction lines for hidden lines and center lines 3. Finalize the drawing by creating (a) visible lines, (b) hidden lines and (c) center lines on top of the construction lines lines, and (c) center lines on top of the construction lines • Follow these steps when doing HW #3 problems 27 Use construction lines, step by step (I~IV) before finalizing the views with ‘real’ visible lines, hidden lines, and centerlines. 28 29 Precedence of lines •Visible line line •Hidden line •Center line 30 31 32 33 34 35 36 37 38 39 40 Comments on HW #1 Comments on HW #1 On page 1 (upper-right corner), put upper- Page 1, then page 2 (patent page) Staple Include the dimensions of the object? 4 grids? “MAE 1004 HW #1, your name, lab section” Arrowheads in dimensioning Arrowheads in dimensioning - Yes or No? or No? HW #1 will be returned in your lab section this week keep the paper clean and neat; use folder keep the paper clean and neat; use a folder 41 42 43 MAE 1004 MAE 1004 Read Assignment: Chapter 6 Review the principles and examples in Chapter 6 Start HW #3 today or tomorrow – use Dr. Shen’s office hours if you have questions Shen office hours if you have questions In class practice 44 Practice Practice Draw three views (front, top, and right-side views) of the three top and object object shown below (3 views on one graph paper) Front View View One large grid equals to two small grids The position of the three views should be correct position Use the shown Front View definition Use graph paper (from Blackboard or your own) 45 width 3 8 3 depth height 2 6 4 3 Sketch front, top, and right-side views 14 5 6 36 Three views on one graph paper 8 Front View 3 Use ruler to draw lines; use free hand sketching to draw circles On the problems in Fig. 6.52: one large grid equals to two small grids. one two Count Count the number of grids of each feature to determine its size/location – you should use ruler to help with the measurements. Drawing construction lines first; do not erase them Must show all visible lines, hidden lines, and centerlines properly 46 Use graph paper & follow the steps to sketch the required 3 views for each object. I: draw the ‘4 rectangles’ using construction lines (counting grids, align views); II II: draw ‘primary’ visible lines as construction lines (visualize the views); li li th III & IV: draw “secondary” (more detailed) visible lines with construction lines and then include hidden lines and centerlines as construction lines; V: finalize the three views with ‘real’ visible lines, ‘real’ hidden lines, and ‘real’ th th li li centerlines – must use the “right pencils” to finalize the lines. 47 Check list for drawings in HW #3 Check list for drawings in HW #3 Correctness – do not miss visible lines, hidden lines, and center lines – major penalty on missing lines. Use Dr. Shen’s office hours if you have questions have questions Line qualities are important – will be evaluated in HW assignments and exams Use construction lines and the lines should be light (use a dull construction pencil pencil; no need to erase them) Visible lines should be dark and thick (0.7 mm); complete in onelines should be dark and thick (0.7 mm); complete in one stroke segments Hidden lines (thickness: 0.35 mm): “no gap” with visible lines (unless the dash forms a continuation of a visible line); li th li dash (3.2 mm) and gap (0.8 mm) Center lines (thickness: 0.3 mm): thin and dark; show cross hair in one view - dash (~5 mm) and gap (~2 mm); 48 ...
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