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2.1 Timber defects
Wood Technology · Grade 11 · 12 lessons in the design
What you will be able to do
- classify the different types of timber defects
- explain the causes of timber defects
- value the importance of using defect-free timber for woodworking
Key questions
“Why is it important to address timber defects?”
Lessons
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What are timber defects?
40 min · 1 practice tasks · quizIntroduce timber defects and why they matter.
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Classifying timber defects
40 min · 1 practice tasks · quizClassify the different types of timber defects.
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Knots
40 min · 1 practice tasks · quizDescribe knots and their effect on timber.
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Shakes and splits
40 min · 1 practice tasks · quizDescribe shakes and splits in timber.
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Grain defects
40 min · 1 practice tasks · quizDescribe grain and figure faults in timber.
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Reaction wood, resin and sapwood
40 min · 1 practice tasks · quizDescribe reaction wood, resin pockets and sapwood defects.
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Conversion defects
40 min · 1 practice tasks · quizDescribe defects caused during sawing and planing.
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Seasoning defects
40 min · 1 practice tasks · quizDescribe defects caused during drying of timber.
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Fungal and insect defects
40 min · 1 practice tasks · quizDescribe biological defects caused by fungi and insects.
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Causes of timber defects
40 min · 1 practice tasks · quizExplain the causes of timber defects.
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Selecting defect-free timber
40 min · 1 practice tasks · quizSelect defect-free timber for a given task.
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Review: using defect-free timber
40 min · 1 practice tasks · quizReview the node and the value of defect-free timber.