1. SCALES

2. ENGINEERING DESIGN PROCESS RESULT TRANSFERRED INFORMATION Sketches
a part
Sketches
of ideas
Multiview
Drawing
Shape
Create
drawings
1. Size, Location
Dimensioning
2. Non-graphic information
Manufacture

4. 300 80

6. BOARD
OBJECT

7. 120 30
Drawing
Actual OBJECT

8. Definitely you are now ready to give up the plan of putting dimensions of every intricate parts.

9. Representative Fraction
Drawing Length
RF =
Actual Length

10. RF = 1/60

11. RF = 1: 10
RF = 1: 10

15. Introducing DIAGONAL SCALE2 4 6 8 10 10 8 6 4 2 1

16. 10` 8` 6` 4` 2`

17. SCALE
8) A length of 1 decametre is represented by 5 cm. Find the R.F. and construct a plain scale to measure upto 2.5 decametre and mark a distance of 19m on it.
RF =
Lmax =
LOS =
L C =

18. SCALE
9) A plot of land, one hectare area is represented on a map by a rectangular area of 25cm2. Calculate the RF of the map (1hectare=10000m2). Draw a diagonal scale to read up to single meter from the map. Show a distance of 375 m on the scale.
RF =
Lmax =
LOS =
L C =

19. SCALE
10) Construct a scale to measure 1km, 1/8 of a km, 1/40 of a km in which one km is represented by 4cm. Mark a distance of 2.775km.
RF =
Lmax =
LOS =
L C =

20. SCALE

21. ENLARGING SCALE
RF > 1

22. FULL SIZE SCALE
300 80
RF = 1