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D.T > Stuff I Dont Know > Flashcards

Stuff I Dont Know Flashcards

1
Q

What can be moulded by hand

A

Polymorph

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2
Q

What changes colour at certain temperatures

A

Thermochromic materials

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3
Q

What does seasoning do

A

Removes unwanted sap and moisture so increases resistance to rot and decay

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4
Q

Bending wood

A

Steam bending:
A piece of wood is put in a sealed chest with 100° C heat so it becomes softer and easy to bend

Kerfing:
Evenly spaced saw cuts to bend wood

Laminating:
Thin layers of wood are stuck together, any thickness can be achieved

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5
Q

Casting

A

Die casting:

  • steel moulds ‘dies’
  • molten metals are poured into dies
  • gravity die casting: detail not important
  • pressure die casting: fine detail

Sand- casting:

  • cheap moulds made of sand and clay
  • fill with molten metal and break away mould
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6
Q

Securing materials:

A

Look at sheet

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7
Q

Marking out: drawing circles on metal

A

Dividers

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8
Q

Marking out: drawing lines parallel to edge on metal

A

Odd-leg calipers

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9
Q

Marking out: drawing lines parallel to the edge on wood

A

Marking gauge

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10
Q

Measuring diameters

A 
Inside calipers: inside diameter 
Outside calipers: outside diameter 
Digital caliper
Micro meter
Venice gauge (Not digital)
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11
Q

Squares

A

Wood: try square
Metal: engineers square
45-135°: mitre square

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12
Q

Planes

A

Jack plane (350mm) is larger than smoothing plane (250mm)

Other planes:
Rebate plane
Shoulder plane
Router plane
Plough plane
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13
Q

Glues for plastic

A

Tensol cement
Contact adhesive
Epoxy resin

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14
Q

Glues for wood

A

PVA

Epoxy resin

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15
Q

Composites

A
  • produced by combining different materials to produce better properties

Kevlar: bullet-proof, lightweight

CFRP: aircrafts

GRP: fibreglass

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16
Q

Annealing

A

Used to relieve the internal stresses in the metal making it easier to work

17
Q

Tapping

A

Taper, second, plug

  • tap wrench (inside threads)
18
Q

Threading

A
  • die stock and split die (outside threads)
19
Q

Stuff to know

A

Ball pein hammer

Cold chisel

20
Q

Preparation

A

Metal: decreased and draw filed
Wood: sanded down and planned

21
Q

Metal finishes

A

Electroplating: thin film of metal is fused electrically

Anodising: aluminium, thin film of oxide is thickened

Dip-coating: heated metal - polythene powder - reheated for smooth even finish

22
Q

Classification of files

A

Length, shape, cut

D.T (11 decks)

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