MAE%201004_Lecture%2007%20Sketching%20%5b3%5d-Spring%202011%20%5bCompatibility%20Mode%5d

MAE%201004_Lecture%2007%20Sketching%20%5b3%5d-Spring%202011%20%5bCompatibility%20Mode%5d

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Unformatted text preview: MAE MAE 1004 HW #2 due Wed. in class @3:45 pm * If a student submits his/her HW #2 after 3:47 pm, it will be If student submits his/her HW #2 after 3:47 pm it will be accepted accepted only if a note with the reason(s) is attached to the assignment HW #1 HW #1 – will be returned in the lab th Today’s topic: Chapter 13 Dimensioning (a brief intro for Lab #4 this week) Chapter 6 Sketching and Shape Description (continued) (continued) The “hidden line, gap or no gap” lecture Practice 2/8/2011 – multiview sketching 1 MAE MAE 1004 HW #2 due Wed. in class @3:45 pm * If a student submits his/her HW #2 after 3:47 pm, it will be If student submits his/her HW #2 after 3:47 pm it will be accepted accepted only if a note with the reason(s) is attached to the assignment 2/8/2011 Correctness; Correctness; Construction lines – must show Line qualities (thickness/darkness; uniform thickness – you may rotate the graph paper to maintain uniform thickness of a line) 2 HW #2 Use square graph paper Figure 6.51 on page 191 3 Construction lines can be and should be longer than the corresponding visible lines First set of construction lines (8 construction lines four rectangles) (8 construction lines - four rectangles) H W D Figure 6.51 on page 191 on page 191 4 MAE 1004 HW #2, John Smith, Section 33 Page orientation: Portrait Page 1 of 1 5 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 6 MAE MAE 1004 HW #1 2/8/2011 will be returned in the lab – close to the end of the lab session If you have any question about the grading attach note to your HW #1 grading, attach a note to your HW #1 and and submit both to Prof. Shen in 1 week Grade will be posted at Blackboard (MAE1004_10) Tue. or Wed. this week 7 MAE 004 MAE 004 Engineering Drawing and Engineering Drawing and Computer Computer Graphics Chapter 13 Dimensioning A brief introduction for Lab #4 this week (Check the dimensioning in your HW #1) th di HW #1) 8 9 Dimensions, extension lines, dimension lines, symbols, notes Key principle in dimensioning 10 Size AND Location 11 Extension line (thin) and gap (~1.5 mm) Dimension line (thin) and arrowhead (yes!) 12 13 14 15 16 A leader to a circle should be radial – if extended, it would pass through the center it th th Circle: label its diameter 17 Arcs: specify radius 18 19 Key principle in dimensioning 20 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? (a) ~ (g) * Use Rule #1 or Rule #2? #1 #2? Dash: 4 mm; gap: 1 mm 22 Rule #1: Use hidden lines to show a hole or groove, for example, the hole between right-side and left-side views 23 Rule #2: if visible lines in the opposite view, then hidden lines in this specific view hidden lines in this specific view 24 (1) When to draw hidden lines? (a) ~ (g) * Use Rule #1 or Rule #2? #1 #2? Dash: 4 mm; gap: 1 mm 25 (1) When to draw hidden lines? (2) How to draw hidden lines correctly? Gap or no gap? … hidd li 26 C. Center lines (in all views) used to ndicate axes of C. Center lines (in all views) – used to iindicate axes of symmetrical objects or features, bolt circles, & paths of motion 27 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 28 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 29 30 Review the six views. All lines make sense? 31 32 33 Position of the rear view No hidden lines are shown Position of the rear view. No hidden lines are shown. 34 Is it OK to use ‘the front end of the automobile’ as the front view? 35 36 Study each sample drawing and Identify Identify [1] all visible lines in the three views [2] all hidden lines in the three views [3] all center lines in the three views 37 38 Identify [1] all visible lines the three views [1] all visible lines in the three views [2] all center lines in the three views 39 40 41 Precedence of lines •Visible line line •Hidden line •Center line 42 ...
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This note was uploaded on 11/17/2011 for the course MAE 1031 taught by Professor Yshen during the Spring '11 term at GWU.

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