1. Pre-Engineering
Introduction to CADD
Scales

2. OBJECTIVE
Reading and using a scale

3. Types of Scales
Classified as open-divided scales and full-divided scales.
Architect’s scale
Civil Engineer’s scale
Mechanical engineer’s scale
Combination scale
Metric scale

4. Architect’s Scale Used for architectural and structural drafting.
Divided into feet and inches.
Triangular instruments include 11 different scales.

5. Architect’s Scales

6. Civil Engineer’s Scale
Also called decimal scale.
Used in Civil engineering and manufacturing.
Divided into units representing decimal parts of inch.
Divisions may represent ay measuring unit.

7. Mechanical Engineer’s Scale
Used for drawing machine parts.
Used for measuring in inches or fractional inches.
Also called “size” scales.

8. Metric Scales Referred to as “size” scales.
Commonly referenced on drawings as ratios.
Scale divisions based on number 10.

9. Drawing to Scale

10. Reading the Architect’s Scale

11. Reading the Mechanical Engineer’s Scale

12. Reading the Civil Engineer’s Scale

13. Reading the Metric Scale