Specialist - Timber Flashcards
What does availability mean
The ease of sourcing and purchase
Why is bulk buying timber good
Reduces transportation costs
Often the goods will be cheaper if bought in bulk
What is unit cost
The cost of one unit of the material
What is total cost
The cost of all the materials purchased
What are some ways to change the colour of wood
Staining or painting
What does FSC stand for
Forest Stewardship council
What is the job of FSC
ensures the responsible management of forests, so they are felled responsibly and sustainably
How can woods be used in recycling
Made into MDF or similar composite boards
What is torsion
A twisting force applied to boths ends of a material
What is shear
Forces acting on the material in opposite directions, causing it to split
What is tension
A pulling force on the material
What is compression
An inward pushing force on the material
What is bending
Forces at an angle - particularly in sheet materials
What are some measures taken to woods, to stop timber from warping due to moisture or other conditions
Metal brackets which hold the wood in place
Why are hardwoods less likely to warp than softwoods
Because they are more dense and have a closer grain
What is the tensile strength of wood
Very high due to grain and structure
What an affect tensile strength of wood
water
What is the compression strength of wood
Excellent, it is very good at withstanding compression
What is the main factor which weakens all aspect of woods strength
Moisture
What is the bending strength of wood
Liable to snap, however certain factors, such as heat or steam, can soften the grain enough to allow the wood to bend and set
What is kerfing
Creating slots in the wood with a straw, allowing the wood to bend, and applying glue to the slits
How can you increase the torsional strength of timber
By using metal brackets
What are the 6 R’s, used to reduce the negative environmental impact of wood
Reduce, Reuse, Refuse, Recycle, Repair, Rethink
What actions are B and Q taking to reduce the negative environmental impact of wood production
Giving away free wood, which would normally be discarded
How is wood filler made
By using sawdust from soft wood and combining it with woodglue
Which continent has seen an increase in forestry and trees
asia
What is meant by mature timber
trees that is the correct age for timber
How long do softwoods take to mature
10-15 years
What is a company that uses soft wood
IKEA
What is a company that uses hard wood
Oak furniture land
What does debarking mean
The removal of bark from a tree
What does PAR stand for and mean
Planed all round, a process done to wood planks to smooth them out
What does rough sawn mean
Where the timber has not been planed, only sawn
Which is better, rough saw or PAR
rough saw is cheape, but PAR takes varnish and finishes better
What does seasoning mean
Drying wood so it can be used
What are the two methods of seasoning
Air drying
Kiln drying
How long does air drying take
1 year
What is kiln drying
Using heat and pressure to remove moisture from wood, as well as killing bacteria and insects which could harm it
What is the typical moisture content of wood when it is first felled
Over 50 percent
What is the moisture content needed for exterior use of timber
20 percent
What is the moisture content needed for interior uses of timber
15 percent (10 if it will be subject to lots of heat)
How does plywood increase strength
By laminating the sheets so as the grains are running parallel to each other, which greatly increases in their strength
Which boards are made using lamination techniques
Plywood and blockboard
What are 3 forms which woods come in
Boards
Square sections
Dowel
Sheets
What is continuous production
Production which runs 24 hours a week
What is batch production
Batch products are produced in smaller quantities
