1. 2.00 Explain and demonstrate basic sketching skills and techniques.

2. 2.01 Explain the concepts related to sketching.
Sketching Concepts
2.01
Explain the concepts related to sketching.

3. Quickly & easily get an idea on paper
Purpose of a Sketch
Quickly & easily get an idea on paper
Design sketches
Freehand technical sketches
Technical illustrations
Most technical drawings start with a sketch

4. Freehand Technical Sketch

5. Design Sketch
Leonardo Divinci sketch

6. Technical Illustration

7. Paper Pencil Optional Sketching Materials Soft lead Eraser Grid Paper
Graph paper
Isometric grid paper

8. Proportion Clarity Sketching Aids Sketching Technique
Sketches must be proportional
Use aids when sketching
Pencil-sight sketching
Pencil as a measuring device
Keep your eye on the point to which you’re drawing

9. Vertical lines Long straight lines Sketching Lines Top to bottom
Series of short straight lines
Use edge of plain paper as an aid to the eye for keeping lines straight
Move your entire arm
Don’t draw from your wrist

10. Sketching Circles & Arcs
Begin by lightly constructing a square
Add center marks to square
Draw

11. Begin with 90° angle Sketching Angles Subdivide once Subdivide twice
45°
60°
30°
Subdivide once
Subdivide twice

12. Sketching Assignment

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

14. Sketching
Types of Sketches
Single-view
Multi-view
Pictorials

15. Single-view Sketching
Technical purposes
Front view
Most descriptive features

16. Steps for Single-view Sketching
Object
Step 2
Step 1
Step 3
Step 4

17. Multi-view Sketching
Technical sketch
Front view
Top view
Side view

18. Multi-view Sketch
TOP VIEW
FRONT VIEW
R. SIDE VIEW

19. Single-view/Multiview Sketch Assignment

20. Quickly communicate an idea Three dimensions in one view
Pictorial Sketches
Quickly communicate an idea
Three dimensions in one view
Width
Height
Depth

21. Pictorial Sketches
Three (3) types
Isometric
Oblique
Perspective

22. Isometric Sketch
HEIGHT
WIDTH
DEPTH

23. Three equally spaced axes of 120°
Isometric Sketching
The prefix “iso” means equal.
Other positions are possible depending on what surfaces of the object are being emphasized
Ellipses must be oriented according to the plane in which they appear
Three equally spaced axes of 120°

24. Isometric Sketching
Receding lines
Typically 30° off horizontal

25. Isometric Sketching
Circular shapes appear as ellipses

26. Isometric Ellipses
Correct ellipse orientation

27. Non-Isometric lines Isometric Sketching Locate endpoints and connect
You can measure along “isometric lines”
You cannot measure along “non-isometric lines”
A standard angle measuring device such as a protractor cannot be used to measure angles in isometric
Angles are drawn by locating their end points

28. Oblique Sketch
HEIGHT
DEPTH
WIDTH

29. Front view is drawn true shape and size
Oblique Sketching
Front view is drawn true shape and size
Front view is normal to the viewer’s line of sight
Circles and curves appearing on the side and top planes will be distorted
Receding edges can be sketched at any angle except vertical or horizontal
Long side of an object, circles, and arcs should be shown in the frontal plane to lessen distortion

30. Oblique Sketching
Receding edges are usually drawn at an angle of 30°, 45°, or 60°

31. Oblique Sketching
Circles and curves drawn on frontal plane will appear true shape and size

32. Perspective Sketches
1-Point Perspective
2-Point Perspective

33. Perspective Sketches
Objects appear as the eye would see them
Most realistic type of pictorial sketch
Most difficult pictorial sketch to draw