Study Guide
for
IS 123—Technical Drafting
Spring 2006
Prepared by
Dr. Warner Smidt
Topic
#1 – Introduction to Technical Drafting
Topic
#1 – Introduction to Technical Drafting
Topic
#3 – Geometric Construction
Topic
#4 – Orthographic Projection
Topic
#6 – Revoled & Removed Sections
Topic
#11 – Designating Surface Textures
Topic
#12 – AutoCAD: Introduction to AutoCAD
Topic
#13 – AutoCAD: Using Windows
Topic
#14 – AutoCAD: The Basics
Topic
#15 – AutoCAD: Creating a New Drawing
Topic
#16 – AutoCAD: Drawing Lines and Erasing
Topic
#17 – AutoCAD: Introduction to Plotting
Topic
#18 – AutoCAD: Locating Points
Topic
#19 – AutoCAD: Zooming, Panning &
Screen Refreshes
Topic
#20 – AutoCAD: Drawing Circles,
Ellipses, Arcs, Rectangles, & Polygons
Topic
#21 – AutoCAD: Selecting &
Deselecting Objects
Topic
#22 – AutoCAD: Drawing with Object Snap
Topic
#23 – AutoCAD: Drawing with Coordinate
Filters
Topic
#24 – AutoCAD: Querying the Drawing for
Information
Topic
#25 – AutoCAD: Editing Commands—Part 1
Topic
#26 – AutoCAD: Editing Commands—Part 2
Topic
#27 – AutoCAD: Line Types, Thicknesses,
& Colors
Topic
#28 – AutoCAD: Placing Text on Drawings
Topic
#30 – AutoCAD: Basic Dimensioning
Topic
#31 – AutoCAD: Editing Dimensions
Topic
#32 – AutoCAD: Dimensioning with
Tolerances
Topic
#34 – AutoCAD: Sectioning
Topic
#35 – AutoCAD: Model vs. Paper Space
Topic
#36 – AutoCAD: Other Useful Features
Topic
#37 – AutoCAD: Isometric Views
Topic
#38 – AutoCAD: Introduction to 3-D
|
ED&D |
Engineering Drawing and Design textbook |
|
AAB |
AutoCAD and its Applications Basics textbook |
|
ellipses points |
When following a page number, it means the respective topic in the book starts on the given page and the student should read everything on the respective topic |
|
<Enter> <Right-Click> |
Keypresses or mouse click |
|
<Ctrl-S> |
Hold one key down while pressing another, then releasing both |
|
<Tab> <Enter> |
Press one key and release before pressing the next key and releasing it. |
|
FMM |
abbreviate meaning from main menu, used when designating where a command is located |
|
FMM
> File > Save |
Greater than sign (>) chains together the sequence of menus and submenus that must be traversed before arriving at a given submenu or command |
|
|
|
Topic #1 – Introduction to Technical Drafting
Technical drawings are just one type of drawings, but they are the primary ones used in construction, manufacturing, and maintenance sectors.
1. various types of technical drawings
2. standard drawing sizes (English units)
a. A
b. B
c. C
d. D
e. E
3. standard drawing sizes (metrics units)
a. A4
b. A3
c. A2
d. A1
e. A0
4. standards organizations
a. ASME
b. ISO
c. DIN
d. JIS
1. ED&D: Language of Industry (p. 1-4); drawing sizes (p. 34-35); filing & storage (p. 38-40); drawing reproduction (p. 4‑44)
2. AAB:
1. What is the overall page size for Size A drawing? B? C? D? E?
2. What is the overall page size for Size A4 drawing? A3? A2? A1? A0?
3. What are zone marks & their purpose?
Freehand sketching is used to plan drawings, figure out the various views, and organize the layout. Sketches will save a considerable amount of time due to less modifications will have to be made on the final production drawings. Plus, when you are in the field on a construction site or out on the manufacturing floors, many times drawing a sketch is a faster way to communicate directions to fellow workers than merely explaining it verbally.
1. ability to do 1/10”, 1/5”, 1/8”, 3/16” & ¼” high vertical lettering (guide lines or slotted template permitted)
2. ability to do freehand sketching—without the use of a ruler or straight edge (with and without graph paper assistance)
1. ED&D: Fig 4-1-6 Approved Gothic Letter (p. 53)
2. AAB:
1.
2.
3.
Topic #3 – Geometric Construction
1.
2.
1. ED&D:
2. AAB:
1.
2.
3.
Topic #4 – Orthographic Projection
1. first-angle projection
2. third-angle projection
3. three-view drawings
4. one- & two-view drawings
5. use of miter line
6. inclined (or sloped) surfaces
7. oblique surfaces
8. circular features
9. partial views
10. conventional breaks
1. ED&D: p. 98-117
2. AAB: p. 221-224
1.
2.
3.
1. front auxiliary view
2. top auxiliary view
3. right auxiliary view
4. primary auxiliary view
5. secondary auxiliary view
6. “true length” lines (or edges)
7. “true shape” surface
8. Ray command (AAB: p. 227...)
9. XLine command (AAB: p. 230...)
1. ED&D: p. 148-156
2. AAB: basics (p. 224-226)
1. On any orthographic or auxiliary view, designate which lines (edges) are true length?
2. On any orthographic or auxiliary view, designate which surfaces are true shape?
3.
Topic #6 – Revolved & Removed Sections
1.
2.
1. ED&D: p. 266-269
2. AAB:
1.
2.
3.
Due to the shape of many real world objects, you cannot see all the features from the traditional orthographic views. Even though hidden lines allow you to have x-ray vision, it still may not be clear. Section views is a technique whereby portions or the object are “chopped” away so you can see what is behind or inside.
1. full sections
2. half sections
3. offset sections
4. partial sections
5. cutting plane line
6. section lines
7. dealing with ribs, spokes, holes, & lugs in section
1. ED&D: p. 256-266
2. AAB: basics (p. 697-701)
1.
2.
3.
1. unidirectional dimensioning
2. aligned dimensioning
3. extension lines
4. dimension lines
5. center lines
6. general notes
7. dual dimensioning
1. ED&D:
2. AAB:
1.
2.
3.
Pay particular attention to the Basic Rules for Dimensioning section in ED&D p. 201-202.
The size and shape of manufactured or constructed items are not perfect. The more perfect or higher degree of accuracy that an object must be made to, the more costly and time-consuming it is. The molds for doing plastics injection molding may need to be accurate to 10,000ths of an inch or less; whereas, the location of critical studs in a house wall only need to be accurate to 1/8” and non-critical studs could vary several inches.
Tolerances are placed on drawing when the size, shape, or location features must fall within certain limits or ranges.
1. actual size
2. nominal size
3. basic size
4. design size
5. limits of size
6. tolerance
7. bilateral tolerance
8. unilater tolerance
9. maximum material size
1. ED&D: p. 213-218
2. AAB:
1.
2.
3.
Fits and allowances are the special use of tolerances as they apply to mating parts.
1. clearance fit
2. transition fit
3. interference fit
4. basic size
5. deviation
6. upper deviation
7. lower deviation
8. tolerance
9. tolerance zone
10. fundamental deviaiton
11. basic hole system
12. basic shaft system
1. ED&D: p. 219-226
2. AAB:
1.
2.
3.
Topic #11 – Designating Surface Textures
Only in theory are flat surfaces perfectly flat or curved surfaces perfectly shaped. In the real world, there is no such thing. Every surface has some deviations from the “true” or “perfect” shape. There are special symbols which are placed on drawings which specify the texture and degree of variation allowed for given surfaces.
1.
1. ED&D: p. 226-233
2. AAB:
1. What is the difference between a drilled only hole and a reamed hole?
2.
3.
Topic #12 – AutoCAD: Introduction to AutoCAD
1. Turning ON/OFF Automatic Save
2. Turning ON/OFF Create Backup copy with each save
1. ED&D: overview (p. 19-29)
2. AAB: Chapter 1 (p. 19...); Chapter 2 (p. 51...)
1.
2.
3.
Topic #13 – AutoCAD: Using Windows
1. files
a. file name
b. file path
c. file specification (file spec)
d. sibling file
2. folder (or directory)
a. child folder
b. parent folder
c. sibling folder
3. basic Windows skills
a. create a file or folder
b. delete a file or folder
c. rename a file or folder
d. copy a file or folder
e. move a file or folder
f. Read Only attribute of a file or folder
4. at the application level
a. Minimize button
b. Maximize button
c. Restore button
d. Close button
e. title bar
5. at the document level within the application
a. Minimize button
b. Maximize button
c. Restore button
d. Close button
e. title bar
6. New command
7. Open command
8. Save command
9. Save As command
10. items listed at the near bottom of the File menu option
11. items listed at the near bottom of the Window menu option
12. combination box (combo box)
13.