FREEHAND DRAWING / SKETCHING
The act of drawing without the use of technical drawing instruments is called freehand drawing or sketching.
The following materials are usually used in freehand sketching: 1. Drawing paper 2. Drawing pencil (B grade pencils are used, especially 2B but you can start with with HB or F). 3. Erazer
TECHNIQUES OF FREEHAND SKETCHING 1. The paper should not be fixed to the board so as to be able to turn it round when the case arises. 2. Horizontal lines are better drawn from left to right noting the two end points. Do not retrace the lines. Finished lines must be hard and clean. 3. Note the distinctions between thick and thin lines such as outlines, object lines, centre lines, dimension lines, hidden detail lines. 4. Angles are quite closely approximated. For right angles, use vertical and horizontal lines on the square paper. For 45°, use the diagonals to square. For 30° and 60°, they can be gotten by an estimated division of a right angle by the eye as far as the other angle. 5. For circles and arcs, use simple geometrical constructions. Draw the centre lines and two 45° radial lines, estimate the radius and draw the curve joining two points on the lines. Similar circles and arcs may be drawn without such constructions. 6. All features are shown in the correct proportions. Start your drawing by fixing the overall sizes, work from the bigger to smaller sizes.