1. U1-L9
September 11, 2009
DRILL
Why do engineers use orthographic projections? Answer in a complete sentence.
What does the prefix “ortho” generally mean?
Get out last night’s 3-view drawing homework assignment.
Engineers use orthographic projections because they are sufficient for correctly manufacturing an object as the designer intended.
“Ortho” generally means straight.

2. U1-L9
HOMEWORK CHECK
Working with 1 or two partners, check ALL your answers to the 3-view drawing worksheet.
You have 4 minutes.

3. U1-L9
Go to Sketchup File

4. U1-L9
CLASSWORK/HOMEWORK
TOP
FRONT
RT SIDE

5. U1-L9
Go to Sketchup File

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7. U1-L9
Go to Sketchup File

8. U1-L9

9. U1-L9
Go to Sketchup File

10. U1-L9

11. Title Blocks Take out a sheet of notebook paper.
U1-L1
Title Blocks
Take out a sheet of notebook paper.
Title it between last and 2nd–to-last lines.
Never write in line above it (no X’s).
class #
BPI NOTESHEET AUG LAST, F. 1

12. Note Sheets On top line, identify the unit we’re in.
U1-L1
Note Sheets
On top line, identify the unit we’re in.
Never write in line directly below it (no X’s)
UNIT 1 – GENERAL CONDITIONS
BPI NOTESHEET AUG LAST, F. 1

13. How many degrees are in a RIGHT ANGLE?
U1-L9
How many degrees are in a RIGHT ANGLE?
What is the total number of degrees in a SQUARE?
Divide that square in half, diagonally. How many degrees are in each triangle?
How many degrees is each ANGLE in this right triangle?
Degrees
Degrees
Degrees
1 = 90 Degrees 2 1 3
2 = 45 Degrees
3 = 45 Degrees

14. Triangles A triangle with all sides equal lengths is an
U1-L9
Triangles
A triangle with all sides equal lengths is an
A triangle with all angles equal is an
A triangle with 2 sides/angles equal and 1 side/angle different is an
The sum of the three angles in ALL triangles is ____ degrees.
Equilateral Triangle
Equilateral Triangle
Isosceles Triangle
360

15. DRAFTING A form of graphic communication A universal language
U1-L9
DRAFTING
A form of graphic communication
Drawings are often the best way to describe or show our ideas
A universal language
Symbols (lines and figures) have specific meanings
Accurately describes the shape, size, material, finish, and fabrication of a product
Standardized over most of the world (possible to interpret drawings made in other countries)
Manual drafting – paper and tools
Computer-Aided Design and Drafting (CADD)

16. TOOLS Compass - circles Sharpened Pencil - different line weights
U1-L9
TOOLS
Sharpened Pencil - different line weights
Drawing Board
Smooth, flat surface
T-Square
“Head” and “Blade”
Horizontal lines ONLY
NEVER for vertical lines or for other uses
Triangles
30-60 degree triangle
45 degree triangle
Compass - circles

17. U1-L9
TOOLS

18. DRAFTING HORIZONTAL LINES VERTICAL LINES
U1-L9
DRAFTING
HORIZONTAL LINES
Hold t-square TIGHT against board
PULL your pencil, DO NOT push it
Hold pencil at slight angle to paper (60 degrees)
Twist your pencil to keep a consistent point
DO NOT allow pencil to go under t-square
VERTICAL LINES
Hold triangle TIGHT against t-square

19. HOMEWORK Complete the front and back of the 3-view/lettering handout.
U1-L9
HOMEWORK
Complete the front and back of the 3-view/lettering handout.
Each of the lettering lines should be completely filled in.