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WorksheetsConversion of Timber
Total questions: 20
Worksheet time: 20mins
The term that describes cutting down trees is....
chopping
felling
knocking
conversion
The most common type of commercial timber harvesting in Ireland is....
clear felling
Selection harvesting
Shelterwood
Managed harvesting
Commercial timber harvesting usually happens in
Winter
Summer
At night
In sunny weather
Advantages of felling trees in winter are....
The amount of sap is normally low at this time because most trees grow very little in winter.
Fewer leaves on trees makes it easier to strip branches off tree trunks.
There is a lower risk of the log drying out too quickly.
Trees are softer and easier to cut in winter.
Disadvantages of clear felling would be
Leaves large areas of poor/bare land for many years until area is replanted.
Doesn't have any disadvantages
Can leave areas land exposed to land slide.
Heavy machinery is used to fell and transport the tree logs, which damage the local ecosystem.
Waste products from timber harvesting / conversion such as bark, branches and saw dust can be recycled into the products such as....
wood pellets for stoves
bark mulch
manufactured boards like chipboard / MDF
These waste products cannot be recycled.
The process of converting (cutting) logs into boards of usable timber is called....
Boarding
Conversion
Cutting
Planking
Reasons for converting timber logs to boards include:
allows wood to dry faster.
produces wood of usable size and shape.
quality of the timber to be viewed and evaluated.
reduces defects in timber.
Select common methods of conversion of timber:
Through & Through Sawing
Radial Sawing
Tangential Sawing
Quarter Sawing
Advantages of Through and Through Sawing include
Fast
Low cost
Very stable boards
Very attractive grain pattern.
Advantages of Quarter Sawing include
Fast
Low cost
Very stable boards
Very attractive grain pattern - Silver Grain
Advantages of Tangential Sawing include
Fast
Very durable boards
Boards do not split easy
Very attractive grain pattern - Flame Figure
Name the grain pattern
Flame Figure
Silver grain
Straight grain
Burr grain
Name the grain pattern
Flame Figure
Silver grain
Straight grain
Burr grain
Disadvantages of Through & Through Sawing include
Slow
Boards tend to cup
Grain pattern isn't very attractive
No very strong
Disadvantages of Quarter Sawing include
Expensive
Narrow boards
Grain pattern isn't very attractive
Lots of waste
Disadvantages of Tangential Sawing include
Expensive
Boards can shrink / cup
Grain pattern isn't very attractive
Lots of waste
Name the method of conversion show in this picture....
Quarter Sawing
Through & Through Sawing
Radial Sawing
Tangential Sawing
Name the methods of conversion show in this picture....
Quarter Sawing
Through & Through Sawing
Radial Sawing
Tangential Sawing
Name the methods of conversion show in this picture....
Quarter Sawing
Through & Through Sawing
Radial Sawing
Tangential Sawing
