Page 24 - ENGINEERING DRAWING

17

2.4 Geometrical Construction

i. Constructing parallel line

CONSTRUCTION

1. Draw the given line AB and locate point C, through which a parallel line has to be
drawn.

Method 1

2. Mark any point D on AB. With D as the centre and DC as the radius, strike an arc CE
to meet AB at point E.
3. With E as the centre and maintaining the same radius DC, strike an arc DF.
4. Set the compass to a chord of arc CE, and lay off the chord DF from point D, thus
locating point F.
5. Draw a line through F and C, which is parallel to AB.

Method 2

1. Set the compass to a 50 mm radius (distance of the parallel line from AB) and from
any points C and D on AB. Strike two arcs.
2. Draw a line EF tangent to (barely touching) the arcs, which is parallel to the line AB.