Common Drawing Instruments
1. Drawing Board:
This is a flat wooden board with a smooth, rigid surface. It is of different sizes depending on where it is used as shown in the table below.
|585 × 452 mm||This is commonly used|
|812 × 452 mm||This size of a drawing board|
is used in offices.
This is a T-shape instrument containing a head and a stock. It is used for drawing horizontal lines, for setting the paper on the board and also to support the set square during drawing. It is placed on the drawing board with a stock at the left-hand edge of the board. It can be made of wood or plastic.
These are instruments in the form of a right-angled triangle, made of plastic. We have the 45° and 30°/60° set squares. They are used for drawing vertical and angled (slanted) lines. They can be made of plastic or wood.
4. Scale Rule:
This is a 30cm wooden or plastic ruler, used for measuring lengths and dimensions of scale drawings. It is a three-sided ruler used by architects to convert dimensions into a smaller drawing of a building plan and readers of blueprints to translate the drawing into the real sizes for construction.
The protractor is a plastic semi-circular instrument, used for measuring angles in degrees.
6. French curves and Flexible curves:
This instrument is used to draw different types, sizes, and shapes of curves. It enables one to draw curves that would be difficult to achieve with a compass. The flexible curves are used for the same purpose.
7. Drawing set:
This is a pack containing different drawing items like a pair of compasses and dividers.
A compass is used for drawing circles and arcs. There is the small bow compass and the large–size compass.
It resembles a compass but has two pin edges. It is used for copying lengths, i.e. transferring measurements from the metric rule to the drawing. It is also used for scribing(scribed; scribing) To scribe is to mark a line by cutting or scratching with a pointed instrument. circles or semi-circles on metal surfaces.