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3.4.1 Lines in Orthographic Drawing
Lines on an engineering drawing signify more than just the geometry of the object
and it is important that the appropriate line type is used.
3.4.1.2 Line thickness
For most engineering drawings, it requires two thickness, a thick and thin
line.
A thick continuous line is used for visible edges
and outlines
A thin line is used for hatching, leader lines, short
center lines, dimensions and projections
3.4.1.2 Line styles
Other line styles used to clarify important features on drawing are :
Thin chain line commonly used to indicate center
lines (center of a circle, cylinder features or line of
symmetry).
Dashed lines are used to show the important
hidden detail for example wall thickness and
holes.
Figure 3.9 below shows an example of the used of lines in orthographic drawing :
Figure 3.9 : Example of the used of lines
