DT Paper 3 Flashcards

1
Q

Air seasoning

A

Planks are stacked on top of each other to allow the air to circulate between them so that they can dry out

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2
Q

Kiln seasoning

A

Planks are stacked on top of each other to allow the heated air to circulated by the fans to dry the timber at a faster speed than air seasoning.

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3
Q

Warping

A

Bending and twisting of timber, should be avoided

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4
Q

Advantages of manufactured boards

A

Environmentally friendly
Do not split
Less costly
Wider variety of lengths

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5
Q

Steam bending

A

Deforming process

Thin layers of timber are placed into a steam chamber where steam enters and travels through the chamber, heating up the veneer and absorbing the timber. This makes the timber malleable and flexible as the veneers are removed, which makes it possible to bend the timber into different shapes and then left to cool.

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6
Q

Laminating

A

this process involves no heat as it used thin laminates of timber and bonds them to each other over a former. PVA adhesive is used as it is cheap, non toxic and easy to work with.

This process is used in furniture making.

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7
Q

Ferrous metals

A

Are alloys that contain iron

High melting and boiling points

Can rust as they react with oxygen

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8
Q

Ferrous metals:

A

Cast iron

Stainless steel

HSS - high speed stainless steel

Mild steel

High carbon steel

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9
Q

Non-ferrous metals

A

alloys that don’t contain iron

Lead

Tin

Zinc

Duraluminium

Aluminum

Brass

Bronze

Copper

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10
Q

Changing structure of metals

A

Work hardening

Annealing

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11
Q

Case hardening of mild steel

A

Faster process which usually only hardens the outer 0.05 mm of the metal unless the process is repeated to increase the depth.

Metal more malleable and flexible as the core isn’t hardened.

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12
Q

Joining acrylic with other plastics

A

Acrylic cement

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13
Q

Joining polystyrene and fabrics

A

Contact adhesive

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14
Q

Joining metals to plastic

A

Epoxy resin (it’s waterproof)

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15
Q

Joining timber

A

PVA - polyvinyl acetate

Synthetic resin

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