Career &
Technical
Sketching
Education
Explain and demonstrate basic
sketching skills and techniques.
Sketching Concepts
Explain the concepts related to
sketching.
Purpose of a Sketch
n
Quickly & easily get an idea
on paper
¡
Design sketches
Freehand technical sketches
Technical illustrations
¡
¡
Freehand Technical Sketch
Design Sketch
Technical Illustration
Sketching Materials
n
n
¡
Paper
Pencil
Soft lead
n
Optional
¡
¡
Eraser
Grid Paper
Sketching Technique
n
Proportion
n
Clarity
n
Sketching Aids
Sketching Lines
n
Vertical lines
¡
n
Top to bottom
Long straight lines
¡
Series of short straight lines
Sketching Circles & Arcs
n
Begin by lightly constructing a square
Sketching Angles
n
Begin with 90° angle
45°
60°
30°
Subdivide
once
Subdivide
twice
Sketching
Explain the concepts and principles
underlying isometric, oblique and
multiview sketching.
Sketching
n
Types of Sketches
¡
¡
¡
Single-view
Multi-view
Pictorials
Single-view Sketching
n
Technical purposes
n
Front view
¡
Most descriptive features
Steps for Single-view Sketching
Object
Step 1
Step 3
Step 2
Step 4
Multi-view Sketching
n
Technical sketch
¡
¡
¡
Front view
Top view
Side view
Multi-view Sketch
TOP VIEW
FRONT VIEW
R. SIDE VIEW
Pictorial Sketches
n
n
Quickly communicate an idea
Three dimensions in one view
¡
¡
¡
Width
Height
Depth
Pictorial Sketches
n
Three (3) types
¡
¡
¡
Isometric
Oblique
Perspective
Isometric Sketch
H
E
I
G
H
T
WIDTH
DEPTH
Isometric Sketching
n
Three equally
spaced axes
of 120°
Isometric Sketching
n
Receding lines
¡
Typically 30°
off horizontal
Isometric Sketching
n
Circular
shapes
appear as
ellipses
Isometric Ellipses
n
Correct
ellipse
orientation
Isometric Sketching
n
Non-Isometric
lines
¡
Locate
endpoints and
connect
Oblique Sketch
H
E
I
G
H
T
D
E
P
T
H
WIDTH
Oblique Sketching
n
Front view is
drawn true
shape and size
Oblique Sketching
n
Receding
edges are
usually drawn
at an angle of
30°, 45°, or 60°
Oblique Sketching
n
Circles and
curves drawn
on frontal plane
will appear true
shape and size
Perspective Sketches
1-Point
Perspective
2-Point
Perspective
Perspective Sketches
n
n
n
Objects appear as the eye
would see them
Most realistic type of pictorial
sketch
Most difficult pictorial sketch to
draw