TYPES OF LINES - Graphics I

TOPIC 2 : LINES
UNIT 1: INTRODUCTION
TO DRAWING
TYPES OF LINES, THEIR THICKNESS
AND
APPLICATIONS IN ARCHITECTURAL DRAWING
LECTURE BY
Ar. Shreya kataria
AR 113 – GRAPHICS-I
TOPIC 2
L I N E S

WHYSTUDYING THIS TOPIC IS IMPORTANT
IMPORTANCE OF TYPES AND THICKNESS OF LINES IN ARCHITECTURAL DRAWINGS.
When you look at any architectural drawing,
you notice different types of lines that are
showing important details.
Drawings communicate the information.
Being able to interpret a technical drawing is
very important and therefore it is imp. to learn
meaning of each kind of line; Language of
lines.
Each kind of line has a definite form and
weight.
It is imp. to have a good technical knowledge
of these various line characteristics – to
understand correct usage, where and when to
apply them in technical drawing.
Fig.1 - Drawing showing various
types of lines

TYPES OF LINES
1. VISIBLE LINES
2. HIDDEN LINES
3. CONSTRUCTION LINES
4. MOVEMENT/PHANTOM LINES
5. LEADER LINES
6. BREAK LINES
7. CENTER LINES
8. SECTION LINES
9. CUTTING PLANE LINE
10. DIMENSION LINES
11.EXTENSION LINES
12. MARGIN LINE
13. BORDER LINE
14. CHAIN THICK LINES

3. CONSTRUCTION LINES
Drawn to help layout the object. These lines are shown as very light and
thin continuous lines. These act as guidelines.
1. VISIBLE LINES
Visible lines are used to indicate all visible or viewable outside edges
of objects that can be seen in plan, elevation or views. These are
shown as continuous dark thick lines. Also called outlines.
2. HIDDEN LINES
Hidden objects or edges are drawn with medium thick short dashed
lines. These are used to show hidden edges or parts of an object or
objects below or behind another object. Hidden lines are also used to
show shelving or cabinets above a counter.
VISIBLE LINES
Fig.2– object showing
visible lines
hidden lines
construction lines

5. LEADER LINE
Leader lines are used to connect notes or references to
objects in a drawing. Leader lines start as a solid line
and end in an arrow. These are continuous thin lines.
4. MOVEMENT/PHANTOM LINES
These lines are a series of thin long dashes and double short
dashes/dots and used to show movement or imply direction. These are
used to show an alternate position of an object.
One object will be drawn with a solid line and its alternate position
will be drawn with a phantom line. This can include space needed for
drawers to open, cabinet door openings etc. Fig.5– phantom lines
Fig.6– leader lines

8. SECTION LINE
These lines are drawn to make the section evident.
They are continuous thin lines and are drawn generally
at an angle of 45° to the main outline of the section.
They are uniformly spaced about 1 mm to 2 mm apart
7. CENTER LINE
Center lines are used to indicate the centre of a
plan, object, circle, arc or any other symmetrical
object. Series of thin very long dashes and single
dots to create a center line.
6. BREAK LINE
Break lines are used when the extents of a drawing
cannot fit on the size of paper being used when
you only need to illustrate a portion of a design or
a partial view.
Fig.7– types of break lines
Fig.8– center lines
Fig.9- section lines

Fig.11 – dimension line
10. DIMENSION LINE
The dimension line is used to show the measurement of
an object. These are Continuous Thin and dark lines.
Usually terminates with arrowheads or tick markings.
Fig. 10 – cutting plane symbol
and line placed on a dwg.
9.CUTTING PLANE LINE
Location of a cutting
plane is shown by this
line.
The direction of arrows
shows the direction of
the view.
These lines are thick lines.
Cutting plane lines
Arrows at the end of
cutting plane lines

11. EXTENSION LINE
Extension lines are thin lines showing the limits of
dimensions. Dimension lines arrowheads touch the
extension lines. Continuous thin and dark lines Fig.12 – extension line
Fig.13 –Margin line
12. MARGIN LINE
Margin is the edge of the paper
that remains blank. Margin is
provided in the drawing sheet
by drawing margin lines. Prints
are trimmed along these lines.
After trimming, the prints would
be of the recommended trimmed
sizes of the trimmed sheets.
Light continuous Thin lines
Fig.15 –Standard international
paper sizes (in mm)
Fig.14 –Req. sheet size

13. BORDER LINE
Perfectly rectangular working space is determined
by drawing the border lines. Border line is a
boundary.
More space is kept on the left-hand side for the
purpose of filing or binding if necessary. When
prints are to be preserved or stored in a cabinet
without filing, equal space may be provided on all
sides. These are dark continuous thin lines.
13. CHAIN THICK LINE
Indication of lines or surfaces to which a special
treatment is applied. Series of thick very long
dashes and single dots
Fig.13 –Border line
Working space

A N S W E R S
1. CUTTING PLANE LINE
2. LEADER LINE
3. EXTENSION LINE
4. CYLINDRICAL BREAK LINE
5. LONG BREAK LINE
6. HIDDEN LINE
7. VISIBLE LINE
8. CENTER LINE

ASSIGNMENT
On an A2 size sheet , make a chart of types of lines.
Title of the sheet : TYPES OF LINES
Use capital letters for lettering ; write in 0.4mm and gap between two lines should be 0.3mm
Example:
S.NO. NAME SYMBOL DESCRIPTION
1 Visible lines Visible lines are used to indicate
all visible or viewable outside
edges of objects that can be
seen in plan, elevation or views.
These are shown as dark thick
lines
X XXXXX XXX XX XXX X
XX XXX
X XXXXX XXX XX XXX X
XX XXX
DATE OF SUBMISSION
24.12.2020
THANKYOU

TYPES OF LINES - Graphics I

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TYPES OF LINES - Graphics I