Transcript U1-L09 3-view SEP 17

September 17, 2010
DRILL
1. Why do engineers use orthographic projections?
Answer in a complete sentence.
2. What does the prefix “ortho” generally mean?
3. Get out last night’s 3-view drawing homework
assignment.
1. Engineers use orthographic projections because
they are sufficient for correctly manufacturing an
object as the designer intended.
2. “Ortho” generally means straight.
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HOMEWORK CHECK
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Working with 1 or two partners, check ALL
your answers to the 3-view drawing
worksheet.
You have 4 minutes.
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Go to Sketchup File
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CLASSWORK/HOMEWORK
TOP
FRONT
RT SIDE
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Go to Sketchup File
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Go to Sketchup File
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Go to Sketchup File
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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
16 SEP 10
LAST, F.
1
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
16 SEP 10
LAST, F.
1
U1-L1
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How many degrees are in a RIGHT ANGLE?
- 90 Degrees
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What is the total number of degrees in a
SQUARE?
- 360 Degrees
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Divide that square in half, diagonally. How many
degrees are in each triangle?
- 180 Degrees
How many degrees is each ANGLE in this right
1 = 90 Degrees
triangle?
3
2 = 45 Degrees
3 = 45 Degrees
2
1
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Triangles
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A triangle with all sides equal lengths is an
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Equilateral Triangle
A triangle with all angles equal is an
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Equilateral Triangle
A triangle with 2 sides/angles equal and 1
side/angle different is an
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Isosceles Triangle
The sum of the three angles in ALL triangles is
____ degrees.
180
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DRAFTING
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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)
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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
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TOOLS
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DRAFTING
• HORIZONTAL LINES
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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
– Hold t-square TIGHT against board
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