Cupping (Junior Cert Wood Technology): Flashcards
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Practise the cards
12 cards from this deck
What is cupping in timber?
What is cupping in timber?
Edges curl up, creating curve across board width
Main cause of cupping?
Main cause of cupping?
Uneven drying and shrinking
How does uneven moisture cause cupping?
How does uneven moisture cause cupping?
Wood curves as different areas dry at different rates
Flat sawing - cupping risk?
Flat sawing - cupping risk?
HIGH - large flat areas dry unevenly
Quarter sawing - cupping risk?
Quarter sawing - cupping risk?
LOW - cuts are stable
Why does quarter sawing resist cupping?
Why does quarter sawing resist cupping?
Cut at right angles to growth rings → stable
Tangential sawing - cupping risk?
Tangential sawing - cupping risk?
MODERATE - better than flat sawing
Visual impact of cupping?
Visual impact of cupping?
Looks uneven and unappealing
How does cupping affect strength?
How does cupping affect strength?
Reduces strength, creates unstable/weak structures
Impact of cupping on usability?
Impact of cupping on usability?
Difficult in projects requiring flat surfaces
Best controlled drying method for preventing cupping?
Best controlled drying method for preventing cupping?
Kiln drying - keeps moisture steady
Why is proper storage important?
Why is proper storage important?
Avoids humidity & temperature changes