MEEG 202 - homework

Computer-Aided-Engineering Design

MEEG 202

Spring, 2008

Note: all drawings are to be scale 1:1 unless specified

Templates: isogrid sqrgrid
Homework: notes
Solutions

Lab - demo sessions

Session 1, week of February 11-15, Ideation: problem identification - research/data gathering (benchmarking), objectives (needs, constraints);
Session 2, week of February 18-22, Ideation: problem identification - limitations (design specifications = metrics plus target values)
Session 3, week of February 25-29, Basic Sketching: by hand and using SolidWorks
Session 4, week of March 3-7, Solid Modeling - Constructive Solid Geometry;
Please perform the SolidWorks tutorial. (Taken from Solid Works Essentials: Parts and Assemblies Vol. 1, pp. 61-74.)
Hand in an isometric printout with your name by the end of the lab session.
Session 5, week of March 10-14, Solid Modeling - Boundary Representation;
online SolidWorks 'candlestick' tutorial; hand in an isometric printout with your name by the end of the lab session.
Session 6, week of March 17-21, UD Template for standard Multiviews.
Session 7, week of March 24-28, Standard Engineering Drawing using SolidWorks.
Session 8, week of April 7-11, Auxiliary View
Session 9, week of April 14-18, Oblique and Perspective Views
Session 10, week of April 21-25, Section View
Session 11, week of April 28- May 2, Dimensioning and Tolerancing
Session 12, week of May 5-9, Standard Engineering Drawing: putting all the pieces together
Session 13, week of May 12-16, Assembly

Homework #1 (due 2/22)
Engineering Design Problems, Page 620 from text (Bertoline, Wiebe), (problem assignment):

define a real/specific client (sponsor) for your assigned problem [specific web page required],
come up with four unique users (customers) [must prioritize, explain your reasoning as to why they are 'unique' and identify a specific/concrete resource (name, title, of real person you surveyed; specific web page, specific book/article, etc.) for each user]
for each user, develop three needs [at least one must NOT be common to any other user; explain priority of needs for each user]
determine five unique constraints of your problem (obviously must include any from the problem statement on Page 620) [explain how impacts your problem]
identify five unique, specific 'benchmarks' (web sites, people, books, etc.) [explain how impacts your problem; note: see prior points!]

Summarize your findings by coming up with a concise, complete statement defining your engineering problem.

Homework #2 (due 2/29)
By February 21, you will have a Design Project Topic. Your main client (sponsor) is the particular UGrad TA assigned to your topic. The users (customers) will include at a minimum: both UGrad TA's, all your team members, and you must identify at least as many more unique users (customers) as there are team members. Develop and justify a set of prioritized needs with constraints from which you identify and develop a specific set of design specifications (metrics plus target values). Make sure you clearly explain all specific benchmarking/background research and how it impacted your problem definition. Each team member must specifically identify his/her unique user (with prioritized needs) and his/her contribution to constraints, design specifications and benchmarking. The UGrad TA's have asked that you include UDesign spreadsheets (or equivalent) as an Appendix (raw data) to your homework.

Homework #3 (due 3/7)
Make sure your name and section are clearly visible. For full credit on hand sketches, do NOT erase foundation/frame but clearly diffentiate your foundation/frame from your final sketch. Remember, all sketches are 1:1 unless otherwise noted.

both

2.19 - view shown
2.23 (G) - view shown
2.23 (G) - view of the side 'facing' the (G)
Now, from Chapter 3 in your textbook, hand sketch only and use iso grid:
object shown at top of Figure 3.22, Page 92 (cylinder is 50mm in diameter),
driving wheel in Figure 3.71, Page 124, disk is 3/8 inches thick, pin and center also 3/8 inches thick,
a 75mm diameter sphere,
driven wheel in Figure 3.71, Page 124, again 3/8 inches thick

Homework #4 (due 3/14)
Make sure your name and section are clearly visible; all problems using SolidWorks - sketches fully defined.

4.5 - Figure 4.64C: one sketch each for: a., b., and c. - view shown; one unit on grid = 1/2 inch.
4.6 (D) - solid modeling - isometric view; one unit on grid = 10 mm
4.6 (E) - solid modeling - isometric view; one unit on grid = 10 mm
4.7 (D) - solid modeling - isometric view; one unit on grid = 1/4 inch
4.7 (G) - solid modeling - isometric view; one unit on grid = 1/4 inch
4.7 (H) - solid modeling - isometric view; one unit on grid = 1/4 inch

Homework #5 (due 3/21)
Make sure your name and section are clearly visible; all problems using SolidWorks - sketches fully defined.

4.1 - solid modeling - parts c. and d. of profile (E) - isometric view, one unit = 1/2 inch
4.2 - include digital photo or scan of photo of the actual coffee mug
4.6 (F) - solid modeling - isometric view; one unit on grid = 10 mm
4.7 (K) - solid modeling - isometric view; one unit on grid = 1/4 inch
4.7 (L) - solid modeling - isometric view; one unit on grid = 1/4 inch
4.7 (R) - solid modeling - isometric view; one unit on grid = 1/4 inch
4.8 - create only Part 1, - solid modeling - isometric view; one unit on grid = 1 inch

Homework #6 (due 4/11)
All problems using SolidWorks - sketches fully defined and include: border; UD College of Engineering template with: class = MEEG202 (with section), title = problem, drawn by = your name, date, and scale correctly filled in; and correct hidden and center lines.

create A-size UD title block with default being mm; put a note right above title block saying, "all dimensions in mm" and make appropriate changes to the default tolerances;
use that metric or lab's English template as appropriate:
from Chapter 5 in your textbook:
5.3 - solid modeling of (4), (11), and (24) - show front, right, top views; one unit on grid = 10 mm
5.4 - solid modeling of (5), (9), and (24) - (corrected) views as shown; one unit on grid = 10 mm
for the following problems, choose - and explain why - an appropriate front view (on a separate sheet of paper handed in with your drawings)
5.7 - solid modeling of Figure 5.125
5.7 - solid modeling of Figure 5.130
5.7 - solid modeling of Figure 5.151

Homework #7 (due 4/18)
All problems using SolidWorks - sketches fully defined and include: border; UD College of Engineering template with: class = MEEG202 (with section), title = problem, drawn by = your name, date, and scale correctly filled in; and correct hidden and center lines.

6.2 - solid modeling of Figure 6.20 (3), (10), and (16) (grid = 0.5")
6.3 - solid modeling of Figure 6.22
6.3 - solid modeling of Figure 6.26
6.3 - solid modeling of Figure 6.28
6.3 - solid modeling of Figure 6.29
6.3 - solid modeling of Figure 6.31
6.3 - solid modeling of Figure 6.32

Homework #8 (due 4/25)
Use SolidWorks as appropriate - sketches fully defined and include: border; UD College of Engineering template with: class = MEEG202 (with section), title = problem, drawn by = your name, date, and scale correctly filled in; and correct hidden and center lines.

Classic Problem 2, Page 382 - solid modeling
Classic Problem 4, Page 383 - solid modeling
Classic Problem 7, Page 383 - solid modeling
oblique and perspective views are done by hand - can certainly use SolidWorks for standard multiviews, one unit on grid = 1/2 inch:
7.3 - Figure 7.60 (3) - standard views with 45 degree cabinet oblique
7.3 - Figure 7.60 (3) - standard views with 45 degree cavalier oblique
7.3 - Figure 7.60 (22) - standard views with 45 degree cabinet oblique
7.3 - Figure 7.60 (22) - standard views with 45 degree cavalier oblique
7.3 - Figure 7.60 (12) - only show perspective view: single vanishing point 12 inches in front of bottom left corner of box - ground level

Homework #9 (due 5/2)
Use SolidWorks - sketches fully defined and include: border; UD College of Engineering template with: class = MEEG202 (with section), title = problem, drawn by = your name, date, and scale correctly filled in; and correct hidden and center lines.

8.1 - Figure 8.53 (D) - grid size = 0.25" each
8.3 - Figure 8.55 (B) - grid size = 6 mm each
8.6 - Figure 8.64
8.6 - Figure 8.67
for the following problems, make sure all features are dimensioned as shown in problem (use number of decimal places as shown and add notes as shown)
9.2 - Figure 9.81
9.2 - Figure 9.83
9.2 - Figure 9.86
9.2 - Figure 9.89
9.2 - Figure 9.91

Homework #10 (due 5/9)
Use SolidWorks as appropriate - sketches fully defined and all engineering drawings with all features dimensioned and all dimensions correctly toleranced on UD College of Engineering template with: class = MEEG202 (with section), title = problem, drawn by = your name, date, and scale correctly filled in; and correct hidden and center lines.

9.2 - Figure 9.82: use the decimal values as shown, except use three decimal values for the location of the 0.31" diameter hole: for integer values - tolerance is +/- 1 degree; for two decimal numbers - tolerance is +/- 0.10; and for three decimal numbers - tolerance is +/- 0.002 (all dimensions are in inches);
9.3 - complete the table in Figure 9.93
9.4 - complete the table in Figure 9.94
For the assembly below, blocks A, B, C and D have dimensions a, b, c and d respectively as follows (in inches):
a = 0.400 +/- 0.002; b = 1.200 +/- 0.001; c = 3.000 +/- 0.005; d = 5.000 +/- 0.005
- Using absolute tolerancing determine the nominal gap and its bilateral tolerance
- Using statistical tolerancing, repeat the previous problem.
- Using absolute tolerancing, change the dimension of of block D above; what is the minimum size of d to have the smallest gap size 0.001?
- Using statistical tolerancing, change the dimension of of block D above; what is the minimum size of d to have the smallest gap size 0.001?
A pivot in a linkage has a pin shown in the exploded 2D sectioned assembly below. The dimension X and its tolerance is to be established. Tests have revealed that a gap between 0.004 and 0.140 is required for the pivot joint to function properly
- Determine the dimension X and its tolerance using absolute tolerancing
- Establish the dimension X and its tolerance using statistical tolerancing
12.3