Unit 02. Product Design. Materials, Components & Fab. Q4

Isabelle is planning to buy wood for her new furniture project. She noticed that hardwood is more expensive than other types of wood. Why is this the case?

Name one example of a hardwood tree?

In 2023 the UK used approximately 8.5 million cubic metres of sawnwood. A large majority of this wood was grown on Conifer tree plantations. Why do commercial timber companies use conifer trees in their plantations?

Match the correct image with the Timber Defect and add the correct explanation to each .

Groups:

(a) Knots

,

(b) Wet Rot

,

(c) Splits

,

(d) Dry Rot

• These are natural defects caused by the growth of branches

• 
• if allowed to dry too quickly this will occur along the end grain.

• Timber exposed to wet & dry conditions decompose & become brittle when dry & spongy when wet

• 
• Occurs in damp conditions with little air circulation. Reduces the timber to powder

• 
• 

The image shows a hardwood doors designed for kitchen cupboards.

Name a suitable hardwood for the cupboard door.

Name one property of Hardwood which makes it suitable for use in cupboard doors

The hardwood panels for the doors are made up by gluing and clamping together two planks of hardwood each measuring 205mm × 2500mm × 20mm. The doors are then cut to size. Using the information given below calculate how many cupboard doors the manufacturer will obtain from 8 planks of hardwood.

A hardwood door measurement is: 400mm × 600mm × 20mm

Mathematical Equivalence

ON

Using the information provided calculate how many table legs the manufacturer will obtain from 8 lengths of hardwood square section allowing 20mm of waste per leg due to cutting and sizing.

• Hardwood square section measurements: 50 × 50 × 3000mm

• Table legs dimensions: 50 × 50 × 480mm

Mathematical Equivalence

ON

Calculate the total amount of waste produced in making the table legs from the 8 lengths of hardwood square section

Mathematical Equivalence

ON

The fibrous cells of wood contain water, some parts lose water moisture content whilst others do not.  This causes splits in the wood.  Warping and bowing can be caused when parts are different thicknesses. What is this deformation known as.