Conventions used in lines
- International systems of units (SI) – which is based on the meter.
- Millimeter (mm) - The common SI unit of measure on engineering drawing.
- Individual identification of linear units is not required if all dimensions on a drawing are in the same unit (mm).
- The drawing should contain a note: ALL DIMENSIONS ARE IN MM. (Bottom left corner outside the title box)
Typical figures showing various lines used in the construction of engineering drawing is shown in figure 2.
Figure 2 Typical figure showing various lines used engineering drawing
A typical use of various lines in an engineering drawing is shown in figure below:
