1. Technological Design
Sketching

2. Why Draw ? Universal Language or the Language of Industry
“A Picture is worth 1000 words”

3. Line Types Construction Object Hidden used to build the drawings
very light solid line ________
Object
used to show the object
thicker, darker solid line _______
Hidden
used to show hidden features of an object
thin dark dashed line _ _ _ _ _ _ _ _

4. Center lines
A center line represents an axis of symmetry
___ _ ___

5. Sketching Created freehand Must be done neat and clear
use proper perspective
Must be done quickly and efficiently

6. “it is directly proportional to the actual object”
Drawings & Scale
Draw an object to scale…..
“it is directly proportional to the actual object”
Scale:
1 : 1
Is proportional to
1 Unit of Actual Object
1 Unit on Paper

7. DRAWING IS 10 TIMES SMALLER THAN THE OBJECT
Reduced Scale
Scale:
1 : 10
Is proportional to
10 Unit of Actual Object
1 Unit on Paper
DRAWING IS 10 TIMES SMALLER THAN THE OBJECT

8. DRAWING IS 10 TIMES LARGER THAN THE OBJECT
Enlarged Scale
Scale:
10 : 1
Is proportional to
1 Unit of Actual Object
10 Unit on Paper
DRAWING IS 10 TIMES LARGER THAN THE OBJECT

9. Hand drawing – Sketching to scale
Plan your use of space
Choose the appropriate scale
Use the grid on the paper to draw to scale
Label the drawing clearly using good hand lettering skills

10. Sketching to scale–Basic steps
Build a frame

11. Sketching to scale–Basic steps
Block in overall sizes for each detail

12. Sketching to scale–Basic steps
Add the details

13. Sketching to scale–Basic steps
Darken the lines

14. Spacing the Views
Draw the views so that they are balanced on the drawing paper
Avoid crowding or excessive space

15. 6-4 Hidden Surfaces and Edges
Drawing hidden lines

16. Technique Circles 1 2 3 4 5 6