scale conversion & reduce & enlarge scale

1. WORKSHOP
BASIC DESIGN 1ST YEAR
MEASUREMENT DRAWING
Presented By- Rohan Dutta & Kumar Satyam | M.Plan 2nd Year | GCAP |

2. INTRODUCTION
Dimensions
A dimension is for size and position (of the designed/modeled shape).
The purpose of dimensioning is to provide a clear and complete description of an object.
To show dimensions of all parts of drawing is mandatory in Architecture.
Scale
Usually the word scale is used for an instrument used for drawing straight lines.
But actually in Architectural language scale means the proportion or ratio between the
dimensions adopted for the drawing and the corresponding dimensions of the object.
Standard scales
Full Scale (1:1)
Reduced Scale
1 : 10, 1 : 20, 1 : 50, 1 : 100, 1 : 200
Enlarged Scale
10 : 1, 5 : 1, 2 : 1

3. INTRODUCTION
Real Elephant width 3000mm- 5000mm
Drawn Elephant 150mm width
Reduced Scale

4. INTRODUCTION
Reduced Scale

5. INTRODUCTION
Enlarged Scale

6. REPRESENTATIVE FRACTION (R.F.)
The ratio of the size of the element in the drawing to the size of the same element in the
object is called the Representative Fraction (R.F.)
R.F.= Length of the object in the drawing / Actual length of the object
Example 1
If 1 cm length of drawing represents 5 m length of the object, then in architectural scale
it is written as 1 cm = 5 m and in graphical scale it is denoted by
Example 2
If a 5 cm long line in the drawing represents 3 km length of a road, then in
architectural scale it is written as 1 cm = 600 m and in graphical scale it is denoted
by
Architects are required to take very small R.F. since buildings are comparatively very big
as compared to drawing paper size.

7. PLAIN SCALES
Plain scales read or measure upto two units or a unit and its sub-division, for
example centimeters (cm) and millimeters (mm).
When measurements are required upto first decimal, for example 2.3 m or 4.6 cm
etc.
It consists of a line divided into number of equal main parts and the first main part
is sub-divided into smaller parts.

8. THANK YOU