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A level DT > stock forms > Flashcards

stock forms Flashcards

1
Q

what are the categories of metals

A

ferrous
non ferrous
alloys

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2
Q

what is low carbon steel

A

malleable, ductile good tensile strength.

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3
Q

medium carbon steel

A

these carbons are less ductile, hard, malleable and good tensile strength

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4
Q

grey cast iron

A

distributes heat evenly and withstands compression and deformation

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5
Q

white cast iron

A

excellent resistance to abrasion, hard and brittle and good tensile strength

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6
Q

what are the 6 non ferrous metals

A

-aluminium
-copper
-silver
-gold
-titanium
-tin

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7
Q

list four non ferrous alloys

A

-bronze
-brass
-duralumin
-pewter

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8
Q

what are the three categories of timber

A

hardwoods/softwoods and manufactured boards

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9
Q

what range are natural timbers stock forms

A

-rough sawn
-planed square edge (PSE)
-planed all round (PAR)

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10
Q

what is rough saw timber

A

-the cheapest stock from
-surfaces are rough from industrial saws
-cheap due to little processing

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11
Q

what is planed timber

A

-desired to have 90 degrees edge on one or more sides

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12
Q

how much timber is removed from PSE and PAR

A

around 3mm from original cut

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13
Q

what is the difference between PSE and PAR

A

PSE has one square edge
PAR is square on all sides (more expensive)

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14
Q

what are mouldings

A

machined profiles made for functional and aesthetic purposes

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15
Q

what are manufactured boards

A

boards that have been man made for example chip board or MDF

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16
Q

what are advantages of manufactured boards

A

-cheaper than natural timbers
-can be cut to larger scales
-can be enhanced with special properties such as water resistance or fire resistance
-can be aesthetically enhanced

17
Q

name 6 soft woods

A

-pine
-Douglas fir
-Cedar
-Spruce
-Redwood
-Larch

18
Q

what are characteristics of softwoods

A

fast growth
low cost
straight shape
lightweight
easily farmable

19
Q

name six hard woods

A

-Oak
-Ash
-Teak
-Beech
-Birch
-Mahogany

20
Q

what are characteristics of hard wood

A

slow growing
need more land
expensive
best aesthetic qualities
stronger more durable

21
Q

how is MDF made

A

form fine wood dust particles bonded with resin under pressure, where chipboard uses larger chips

22
Q

qualities of MDF

A

perfectly smooth finish
uniform density
ideal for CNC milling

23
Q

what are the main performance characteristics of wood

A

-grain pattern
-warpage, shrinkage or splitting
-machining qualities
-resistance to decay and moisture
-toxicity

24
Q

what causes warpage

A

caused by different moisture levels in different parts of the wood

25
Q

what is shrinkage

A

as wood dry its volume decreases

26
Q

what is splitting

A

as wood dries the fibres separate, usually when wood dries too quickly

27
Q

what is wood when it is anistrpoic

A

when the grain gives natural wood different physical properties in different directions –it is an anisotropic material

28
Q

what woods arent anisotropic

A

manufactured woods

29
Q

what are types of surface defects in woods

A

-knots
-machining marks
-insects, disease or rot

30
Q

what is seasoning

A

it is when the wood is dried to prevent warpage, shrinking and splitting

31
Q

what are the two different types of seasoning

A

-air dried
-kiln dried

32
Q

what are the three types of wood distortion

A

-diamond shrinkage
-cup shaped
-uniform shrinkage

33
Q

what causes shrinkage

A

moisture levels

34
Q

what are the advantages of seasoning

A

-makes the wood more stable
-less likely to decay or rot
-less likely to corrode metals
-absorbs preservatives more easily

35
Q

what types of testing can be used for woods

A

-strength (tensile)
-toughness
-hardness
-density
-corrosion
-malleability
-elasticity

36
Q
A

A level DT (6 decks)

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