HNC CAD: 2D CAD Concepts -

CAD elements

When representing some object by hand sketching, the artist hold a pencil or crayon in their hand and tries to reproduce as good a representation of the object as possible. Some other artists, who have lost the use of their hands can produce stunning sketches by holding the pencil in their mouth or even between their toes.
But what they have in common is the ability to produce flowing curves of differing darkness and thichness by applying differing degrees of pressure to, and continually changing the direction of, the pencil.

The manually staffed technical design offices uses aids to draw the details that build up into technical drawings. The CAD equiped technical design office also uses aids to build up technical drawings.

The draughter uses
• Straight Edges for straight line segments.
• a Pair of Compasses to produce arcs or circles of differing radii.
• a French Curve to produce complicated curves that change in the degree of rotation.
• lots of Templates to help speed up the drawing process.
  Such as
  • Polygon templates, circle templates, rounded corner templates, etc
  • Symbols of object outlines like valves, toilets, resistors, trees, etc