about the diagonal scale

1. 1. SCALES
a. Reducing Scales
• For objects drawn smaller than their actual size
b. Enlarging Scales
• For objects drawn larger than their actual size
SCALES

2. 2. Representative Fraction (R.F.)
• The ratio of the length of the drawing to the actual length of the object
represented
• Represented in the form of X : Y
• X is the unit on the drawing whereas Y is the representation on the
actual object.
• A scale of 1:2 means 1 unit of length on the drawing representing 2
units of length of the object.
• A scale of 2:1 means 2 units of length on the drawing representing 1
unit of length of the object.

3. 3. TYPES OF SCALES
a. Metric Scales
• Based on the decimal system
• Reducing scales usually used are:
1:2, 1:2.5, 1:5, 1:10, 1:20, 1:25, 1:50, 1:100, 1:200, 1:250 etc.
• Enlarging scales usually used are:
2:1, 2.5:1, 5:1, 10:1, 20:1, 25:1, 50:1, 100:1, 200:1, 250:1 etc.
b. Inch-Foot (English) Scales
• Based on decimal and fraction system
• Reducing and Enlarging scales have similar R.F. to Metric scales
in the decimal system.
• Fraction system has R.Fs of the type
1:2, 1:3, 1:4, 1:6, 1:12 etc. or vice versa.

4. 4. INCH DIVISIONS
a. Fractions (8ths)
1

5. 4. INCH DIVISIONS
a. Fractions (8ths)
1/2

6. 4. INCH DIVISIONS
a. Fractions (8ths)
1/4

7. 4. INCH DIVISIONS
a. Fractions (8ths)
1/8

8. 4. INCH DIVISIONS
a. Fractions (8ths)
1/16

9. 4. INCH DIVISIONS
a. Fractions (8ths)
1/32

10. b. Decimal (10ths)
1

11. b. Decimal (10ths)
0.5

12. b. Decimal (10ths)
0.1

13. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.

14. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.

15. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.

16. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0

17. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9

18. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9

19. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9

20. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9
0.37

21. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9
3
2
1

22. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9
3
2
1

23. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9
3
2
1
1.37

24. 5. DIAGONAL SCALES
a. Decimal Based Diagonal Scale
• To measure dimensions in 1/100th of an inch.
0
2
4
6
8 1
3
5
7
9
8
9 3
6
7 4
5 1
2 0
1
2
3
4
5
6
7
8
9
3
2
1
2.64

25. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.

26. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.

27. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.

28. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0

29. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7

30. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7

31. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7

32. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7
45/64

33. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7
45/64
8
16
24
32
40
48
56
48
56 32
40 24 16 8

34. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7
8
16
24
32
40
48
56
48
56 32
40 24 16 8

35. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7
8
16
24
32
40
48
56
48
56 32
40 24 16 8

36. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7
8
16
24
32
40
48
56
48
56 32
40 24 16 8
1 45/64

37. b. Fraction Based Diagonal Scale
• To measure dimensions with the least count of 1/64th of an inch
or smaller.
0
1
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
2
3
4
5
6
7
8
16
24
32
40
48
56
48
56 32
40 24 16 8
2 27/64

38. • Diagonal scale with the least count of 1/128th of an inch
0 3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0

39. • Diagonal scale with the least count of 1/128th of an inch
0 3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0

40. • Diagonal scale with the least count of 1/128th of an inch
0
2
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
4
6
8
10
12
14
1
3
5
7
9
11
13
15

41. • Diagonal scale with the least count of 1/128th of an inch
0
2
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
4
6
8
10
12
14
1
3
5
7
9
11
13
15
83/128

42. • Diagonal scale with the least count of 1/128th of an inch
0
2
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
4
6
8
10
12
14
1
3
5
7
9
11
13
15
83/128

43. • Diagonal scale with the least count of 1/128th of an inch
0
2
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
4
6
8
10
12
14
1
3
5
7
9
11
13
15
83/128
96
112 64
80 48 16
32
96
112 64
80 48 16
32

44. • Diagonal scale with the least count of 1/128th of an inch
0
2
3
2
1
1
2
3
4
5
6
7
6
7 5 4 3 2 1 0
4
6
8
10
12
14
1
3
5
7
9
11
13
15
1 83/128
96
112 64
80 48 16
32
96
112 64
80 48 16
32