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# ORTHOGRAPHIC PROJECTION PowerPoint PPT Presentation

ORTHOGRAPHIC PROJECTION. HOW TO LAYOUT YOUR DRAWING VIEWS. FIRST-ANGLE PROJECTION. The U.S. and Canada uses Third-Angle Projection. The rest of the world uses first-angle projection. All countries start with a FRONT VIEW. THIRD- ANGLE PROJECTION.

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ORTHOGRAPHIC PROJECTION

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VIEWS

### FIRST-ANGLE PROJECTION

The U.S. and Canada uses Third-Angle Projection.

The rest of the world uses first-angle projection.

### THIRD- ANGLE PROJECTION

THIS IS THE LAYOUT USED IN THE UNITED STATES & CANADA.

### SELECTING A FRONT VIEW

THE CRITICAL PART OF LAYING OUT YOUR DRAWING IS SELECTING YOUR FRONT VIEW.

• MINIMAL HIDDEN LINES

• STABLE - SO HEAVIEST PART IS ON BOTTOM

• USE THE MOST BASIC PROFILE

KA-POW!

BOOM!

### COMMON ERROR #4

DON'T BE BEHIND THE

EIGHT BALL!

### SUMMARY:

THE U.S. AND CANADA USE THIRD-ANGLE PROJECTION FOR DRAWING LAYOUT.

THE MOST CRITICAL PART OF THE LAYOUT IS THE SELECTION OF THE FRONT VIEW

• FRONT VIEW SHOULD SHOW:

• THE MOST BASIC PROFILE

• THE FEWEST HIDDEN LINES

• THE MOST STABLE POSITION