WOOD MATERIALS TECHNOLOGY

4th Edition

Chapter 4Drawing

Pencils

Different types of pencil are used for drawing lighter and darker lines

Drawings are usually done with a 2H pencil

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

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

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

Orthographic views

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

Sections

Pictorial drawing

Oblique drawingLines are drawn back at 45° from the elevationDraw pieces separately and build up the drawing

Isometric axisConstructing an isometric axis

Isometric drawing

Examples of isometric drawing

Circles in isometric

Dimensions

Dimensions worksheet 7

Insert these dimensions on the drawing supplied

Dimensions worksheet 7

Insert these dimensions on the drawing supplied

Dimensions worksheet 8

Elevation End view

Plan

Insert these dimensions on the drawing supplied

Dimensions worksheet 8Insert these dimensions on the drawing supplied