Technological Design

Sketching Sketching

Why Draw ?

Universal Language or the Language of Industry

“A Picture is worth 1000 words”

Line Types

Construction 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 _ _ _ _ _ _ _ _

Center lines

A center line represents an axis of symmetry

___ _ ___

Sketching

Created freehandMust be done neat and clear use proper perspectiveMust be done quickly and efficiently

Drawings & Scale

Draw an object to scale…..“it is directly proportional to the

actual object”Scale:

1 : 1

1 Unit on Paper

Is proportional to

1 Unit of Actual Object

Reduced Scale

Scale:

1 : 101 Unit on Paper

Is proportional to

10 Unit of Actual Object

DRAWING IS 10 TIMES SMALLER

THAN THE OBJECT

Enlarged Scale

Scale:

10 : 110 Unit on Paper

Is proportional to

1 Unit of Actual Object

DRAWING IS 10 TIMES LARGER

THAN THE OBJECT

Hand drawing – Sketching to scale

Plan your use of space Choose the appropriate scaleUse the grid on the paper to draw to scaleLabel the drawing clearly using good hand lettering skills

Sketching to scale–Basic steps

Build a frame

Sketching to scale–Basic steps

Block in overall sizes for each detail

Sketching to scale–Basic steps

Add the details

Sketching to scale–Basic steps

Darken the lines

Spacing the Views

Draw the views so that they are balanced on the drawing paperAvoid crowding or excessive space

6-4 Hidden Surfaces and Edges

Drawing hidden lines

Technique Circles

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