This document discusses different types of technical drawings used in materials technology. It covers topics such as using different pencils for lighter and darker lines in drawings, including measurements and scales to allow objects to be reproduced accurately. Orthographic projections show all views of an object, including elevations, plans and end views. Sections are used to show cut views and internal details clearly. Pictorial drawings like isometric drawings represent 3D objects in 2D and include techniques for constructing dimension lines. Worksheets are provided as examples for practice adding dimensions to drawings.

1. WOOD
MATERIALS TECHNOLOGY
4th Edition

2. Chapter 4
Drawing

3. Pencils
 Different types of pencil are
used for drawing lighter and
darker lines
 Drawings are usually done
with a 2H pencil

4. Drawings
 Drawings give enough
information to allow an
object to be made
 Drawings include
measurements
 Sketches are also used to
give information on a
drawing sheet

5. Scales
 Scales reduce or enlarge the
measurements evenly, so that the
proportions of the object stay the same
 Full size measurements are written on
the drawing
 The scale is also written as a ratio on the
drawing

6. Orthographic projection
 A 2D presentation of a
3D object
 Shows all the views of an
object
 Each view is related to
the others
 Elevations, plans and end
views are included in
orthographic drawings

7. Orthographic views

8. Sections
 Show a cut view of a
piece or object
 Used when detail needs
to be shown clearly
− The section through the
candle holder shows
clearly how the pieces
are joined

9. Pictorial drawing

10. Oblique drawing
 Lines are drawn back at 45° from the elevation
 Draw pieces separately and build up the drawing

11. Isometric axis
 Constructing an isometric axis

12. Isometric drawing

13. Examples of isometric drawing

14. Circles in isometric

15. Dimensions

16. Dimensions worksheet 7
Insert these dimensions on the
drawing supplied

17. Dimensions worksheet 7
Insert these dimensions
on the drawing supplied

18. Dimensions worksheet 8
Elevation
End view
Insert these dimensions on the
drawing supplied
Plan

19. Dimensions worksheet 8
Insert these dimensions on the drawing
supplied