lines used in engineering drawing

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 GROUP MEMBERS
 Muhammad Umair
 Danish Kaleem
 Muhammad Bilal
 Armaghan Ali

3. ALPHABET OF
LINES USED IN
DRAWING
TOPICS
 COMMON ALPHABET OF
LINES AND USE OF LINE
 APPLICATION OF LINE
 CORRECT WEIGHTAGE OF
THE LINE
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5. Common Alphabet of Lines
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DEFINATION
Line symbols used in technical drawing are often referred to as
alphabet of lines . The use of line symbols enables engineers/designers to express
features of designed products clearly and accurately

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7. Visible Line
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It is a heavy, dark line which identifies the visible edge or
surface of an object.

8. Hidden Line
 It have medium thickness and used to show edges
that are not visible.It is also known as Broken line
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9. Center Line
 It is chain thin line made up of alternating short
and long dashes. It is used to show the center of an
object.
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11. Dimension Line / Extension Line
 Dimension Lines - used to show the extent of a
dimension.
 Extension Lines - Used to extend a point from an
object.
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12. Leader
 Fine line used to define a point or area.
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Grind Surface
Leader line

13. Cutting Plane Line
 Used to indicate where an imaginary cut is made
through the object.
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14. ANSI
standard
Thick line
JIS & ISO
standard
Thin line
CUTTING PLANE LINESTYLES
Viewing
direction
Viewing
direction
This course

15. EXAMPLE : WEB : crosswise cut

16. Section Lines
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Steel
Cast Iron
Copper,
Bronze,
Brass
Lead, Zinc,
Alloys

17. Phantom lines
•Phantom lines are used to indicate imaginary features such as
alternate positions of moving parts and adjacent positions of
related parts.
•The line type is long dash – short dash
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18. Break lines
•Break lines are used to show imaginary breaks in objects.
•A break line is usually made up of a series of connecting arcs
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21.  Thick line and it’s application
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22.  Continuous thin line is commonly used for dimension
line ,section line,border line and in construction lines .
 Continuous wavy lines are used for short break lines , or
irregular boundry lines
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E.g Continuous thin
line E.g of wavy line
Dimension line
Extension line
Leader line

23.  It is used for long breaks in drawing where we do
not want to make a long line.
 E.g
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24.  They are used to indicate inner and hidden surfaces
 Sometimes they serve as hidden lines in drawings
 We use dashes / hidden lines in that type of drawing where
we want to see hidden features of objects
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 E.g of short dashes
Hole’s
depth

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27. WIEGHTAGE OF LINES
 VISIBLE LINE  This is a type of thick
line and its thickness is
1 to 2mm
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• DIMENSION &
EXTENSION LINE
These both lines are also
included in the
categories of thin lines
and having thickness of 2
to 3mm

28.  CENTER LINE
 It is a type of thin line
and its thickness is 1 to
3mm
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 HIDDEN LINE
 It is also a type of thin
lines and its thickness
is 1 to 2mm

29.  LEADER LINE
The thikness of this line
depend upon its
application.Its thickness
is 1 mm or 2 mm
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