METHODS OF SCALING
Unlike a drawing using a computer, where as object is
Drawn at its actual size so that the information stored
In the computer file is accurate) a printed or paper
drawing may represent the object at its actual size(full
size), or may be a larger or smaller than the object.
Depending on the size of sheet used. Drawing scale is
the reduction or enlargement of the drawn object
relative to the real object.
SCALE DRAWING
Before studying this lesson about scale drawing, you should review
the lesson about solving proportions. Since it is not always possible
to draw on paper the actual size of real life objects such as the real
size of a car or an airplane, we need scale drawings to represent
the size like the one you see below of a car.
In real life, the length of this van may measure 240 inches.
However, the length of a copy or print paper that you could use to
draw this van is a little bit less than 12 inches.
Since 240”/16” = 15, you will need about 15 sheets of copy paper to
draw the length of the actual size of a car van.
1:15
Supposed a problem tells you that the length of a
vehicle is drawn to scale. The scale of the drawing is
1:15
if the length of the drawing of the vehicle on paper is
15 inches, how long is the vehicle in life?
Setup a proportion that will look like this:
Length of the drawing
= 1
real of length 15
The scale drawing of this tree is 1:500
if the height of the tree on paper is 20 inches, what is
the height of the tree in real life?
Height = 20 inches
Length of the drawing 1
=
real of length 500
We get:
height of drawing x 500 = Real height x 1
Since height of drawing = 20, we get: 20 x 500
= real length x 1
10000 inches = Real height
The real length of the tree is 10000 inches
REDUCE AND ENLARGE SCALE
a basic illustration of how scale
methods
there are several acceptable methods to notes scale
on the drawing, but all of them show the relationship
of the size of the object as shown on the paper at half
of its size, list the scale one of these three ways:
SCALE: 1:2
SCALE: 1:1
SCALE: 2:1
For machine drawing, the scale indicates the
ratio of the size of the drawn object to its actual
size, regardless of the unit of measurement used.
Expansion or enlargement scales are given as
2:1, 4:1, 10:1 and so on.
The various scale calibrations available on the metric
scale and the engineers’ scale provide almost
unlimited scale ratios. Preferred metric scale ratios
are 1:1, 1:2, 1:5, 1:10, 1:20, 1:50, 1:100, and 1:200
Metric scale
For machine drawing, the scale indicates the
ratio of the size of the drawn object to its actual
size, regardless of the unit of measurement used.
Expansion or enlargement scales are given as
2:1, 4:1, 10:1 and so on.
The various scale calibrations available on the metric
scale and the engineers’ scale provide almost
unlimited scale ratios. Preferred metric scale ratios
are 1:1, 1:2, 1:5, 1:10, 1:20, 1:50, 1:100, and 1:200
LAYOUT & LETTERING
LAYOUT & LETTERING
Architect scale is intended primarily for drawings
of buildings, piping system, and other large
structures that must be drawn to a reduced scale
to fit on a sheet of paper.
The full-size scale is also useful in drawing
relatively small objects, and for that reason this
scale has rather general usage.
LAYOUT & LETTERING
, regardless
Methods of Scale factor in different value
1cm/10mm = 1M
4cm/40mm = 8M
4cm/40mm = 2M
4cm/40mm = 1M
4cm/40mm = 0.4M
A scale from reference of 1cm : 1M = 1:25 - 1:40 and 1:10,000
8cm/80mm = 8M
8cm/80mm = 2M
8cm/80mm = 3.18 +/- M
8cm/80mm = 2km
Get 1/2 sheet of
paper
1. The scale of a map is 1cm: 5km. The distance between two cities is
112km. How far apart are they on a map?
A. 11.2 cm B. 22.4 cm C. 56 cm D. 560 cm
2. What value of x is needed to make the figures similar as shown?
A. 12 B. 14 C. 16 D.18 5 10
7 x
3. Which of these drawing are a true or a proportion of 1:1 scale of
sun and earth
A. B. C. D.
4. On a drawing, quarter scale would be noted as?
A. 1:25 B. 1:4 C. 1:2 D. 1:1
5. Which of the picture is drawn in correct “ proportion”, assuming this is a pine tree?
A. B. C. D.
Methods of Scale factor in different value
Reference only for guide of the rest scale factor
6) 7) 8)
9) 10) 11)
12) 13) 14)
15) 16) 17)
A scale from reference of 1cm : 1M = 1:25 - 1:40 and 1:10,000
Reference only for guide of the rest scale factor
18) 19) 20)
21) 22) 23)
24) 25)
