handouts

1. 6/29/2015
1
ALPHABET OF LINES
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DIFFERENT TYPES OF LINES
 It is a thick full line. It is used to represent all visible
edges of an object.
VISIBLE / OBJECT LINE
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DIFFERENT TYPES OF LINES
 It is a medium short dash lines approximately 1/8
inches in length and spaced 1/32 inches between the
lines.
 It is used to represent hidden or unseen edges of an
object.
INVISIBLE / HIDDEN LINE
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DIFFERENT TYPES OF LINES
 It is a thin, fine, dark, and solid line with arrowheads on
both ends.
 It indicate the direction and the length of an object
DIMENSION LINE
10 m
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DIFFERENT TYPES OF LINES
 It is also called projection or witness line.
 It is a thin, dark and solid line that extends from a point
on the drawing to which a dimension refers.
 A gap of about 1/16 inches should be left where the
extension would join the object line.
EXTENSION LINE

2. 6/29/2015
2
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DIFFERENT TYPES OF LINES
 It is a thin line with long and
short dashes drawn alternately
which is used to indicate the
axis of symmetry.
 The short dashes should be
about 1/16 inches and the
centerlines should start at the
end with the long dashes.
CENTER LINE
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DIFFERENT TYPES OF LINES
 It is a thin-straight line from a dimension value or
explanatory note on the feature of the drawing.
LEADER LINE
10mm
diameter bolt
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DIFFERENT TYPES OF LINES
 It is a thick line consists of alternate long and short
dashes.
 It is used to show the path of plane of a cut object.
CUTTING PLANE LINE
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DIFFERENT TYPES OF LINES
 It is a thin-curved irregular line with arrowhead similar
to a leader line.
 It is used to give an explanatory note about the
dimension of an object.
REFERENCE LINE
- s
DIFFERENT TYPES OF LINES
 It is a medium weight line consists of two dashes drawn
repeatedly.
 The dashes are 1/8 inches long and 1/32 inches gap
between them and 3/15 inches gap between the dashes.
Repeated / ditto line
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DIFFERENT TYPES OF LINES
 It is classified in to two.
(a) Long Break Lines
- to show that an object has been cut.
(b) Short Break Lines
- to show that part of an object is not large.
BREAK LINES

3. 6/29/2015
3
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DIFFERENT TYPES OF LINES
 It is a thin line drawn 45 degrees with 1/16 inches
between the lines.
 It is used to indicate that part of the object has been
removed.
HATCHING LINE