Sketching

1
Sketching

• 2.00
• Explain and demonstrate basic sketching skills
  and techniques.

2
Sketching Concepts

• 2.01
• Explain the concepts related to sketching.

3
Purpose of a Sketch

• Quickly easily get an idea on paper
• Three main categories of sketches
• Design sketches
• Freehand technical sketches
• Technical illustrations

4
Design Sketch

• Known as Rough Sketches
• Quickly capture a main idea
• Less Restrictive

5
Freehand Technical Sketch

• Multi-view or Pictorial
• Dimensions

6
Technical Illustration

• Most Detailed
• Drawn as close to the real object as possible

7
Sketching Materials

• Paper
• Pencil
• Soft lead

• Optional
• Eraser
• Grid Paper

8
Sketching Technique

• Helps to correctly
• sketch objects and
• Maintain Clarity
• Keep Objects Proportional
• How do I keep proportion?
• Pencil Sight Sketching Technique

9
Sketching Lines

• Vertical lines
• Top to bottom
• Long straight lines
• Series of short straight lines
• Focus on the endpoint of line

10
Sketching Circles Arcs

• Begin by lightly constructing a square

11
Sketching Angles

• Begin with 90 angle

60
45
30
Subdivide once
Subdivide twice
12
Sketching Assignments

• Lesson 4.00 pg. 39 recreate on yellow sheet
• Surface Identification 1
• Surface Identification 2
• Alphabet of Lines on yellow sheet
• Title Block and Border yellow sheet

13
Mechanical Drawing Books

• Page 48 Define Key Terms
• Page 78 Copy Chapter Summary
• Page 78 Review Questions (1-15)

14
Sketching

• 2.02
• Explain the concepts and principles underlying
  isometric, oblique and multiview sketching.

15
Sketching

• Types of Sketches
• Single-view
• Multi-view
• Pictorials

16
Single-view Sketching

• Technical purposes
• Front view
• Contains the most descriptive features

17
Steps for Single-view Sketching
Step 2
Step 1
Step 3
Step 4
18
Multi-view Sketching

• 3 Views of a Technical sketch
• Front view
• Top view
• Side view
• USA Right side
• Europe Left side

19
Multi-view Sketch
20
Single-view/Multiview Sketch Assignment

• Using Blocks for Visualization

21
Pictorial Sketches

• Quickly communicate an idea
• Three dimensions in one view
• Width
• Height
• Depth

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Pictorial Sketches

• Three (3) types
• Isometric
• Oblique
• Perspective

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Isometric Sketch
HEIGHT
WIDTH
DEPTH
24
Isometric Sketching

• Three equally spaced axes of 120

25
Isometric Sketching

• Receding lines
• Typically 30 off horizontal

26
Isometric Sketching

• Circular shapes appear as ellipses

27
Isometric Ellipses

• Correct ellipse orientation

28
Isometric Sketching

• Non-Isometric lines
• Locate endpoints and connect

29
Isometric Sketching Assignment
30
Oblique Sketch
HEIGHT
DEPTH
WIDTH
31
Obliques

• Obliques are theoretical drawings. In reality,
  you can not actually view an object as an Oblique
• Thin parts look very good as Obliques
• Parts with angular features on multiple planes
  are difficult to draw as Obliques

32
Cavalier Oblique

• Front view true size
• Receding Axis Angle (Normally 30, 45
• or 60) is Variable
• Depth dimension (receding axis) true size

33
Cabinet Oblique

• Front view true size
• Receding Axis Angle (Normally 30, 45 or 60) is
  Variable
• Depth dimension (receding axis) half size

34
Oblique Sketching

• Front view is drawn true shape and size

35
Oblique Sketching

• Receding edges are usually drawn at an angle of
  30, 45, or 60

36
Oblique Sketching

• Circles and curves drawn on frontal plane will
  appear true shape and size

37
Circles in Oblique

• Drawn true size in front view
• Drawn as ellipses on receding planes
• Layout using a Rhombus

38
Oblique Sketching Assignment
39
Perspective Sketches
2-Point Perspective
1-Point Perspective
40
1 Point Perspective
41
Perspectives A Real Look
42
2 Point Perspectives
43
Perspectives A Real Look
44
Perspective Sketches

• Objects appear as the eye would see them
• Most realistic type of pictorial sketch
• Most difficult pictorial sketch to draw

45
Perspective Sketching Assignment