Stuff I Dont Know

Question 1

What can be moulded by hand

Answer 1

Polymorph

Question 2

What changes colour at certain temperatures

Answer 2

Thermochromic materials

Question 3

What does seasoning do

Answer 3

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

Question 4

Bending wood

Answer 4

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

Question 5

Casting

Answer 5

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

Question 6

Securing materials:

Answer 6

Look at sheet

Question 7

Marking out: drawing circles on metal

Answer 7

Dividers

Question 8

Marking out: drawing lines parallel to edge on metal

Answer 8

Odd-leg calipers

Question 9

Marking out: drawing lines parallel to the edge on wood

Answer 9

Marking gauge

Question 10

Measuring diameters

Answer 10

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

Question 11

Squares

Answer 11

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

Question 12

Planes

Answer 12

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

Other planes:
Rebate plane
Shoulder plane
Router plane
Plough plane

Question 13

Glues for plastic

Answer 13

Tensol cement
Contact adhesive
Epoxy resin

Question 14

Glues for wood

Answer 14

PVA

Epoxy resin

Question 15

Composites

Answer 15

• produced by combining different materials to produce better properties

Kevlar: bullet-proof, lightweight

CFRP: aircrafts

GRP: fibreglass

Question 16

Annealing

Answer 16

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

Question 17

Tapping

Answer 17

Taper, second, plug

• tap wrench (inside threads)

Question 18

Threading

Answer 18

• die stock and split die (outside threads)

Question 19

Stuff to know

Answer 19

Ball pein hammer

Cold chisel

Question 20

Preparation

Answer 20

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

Question 21

Metal finishes

Answer 21

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

Question 22

Classification of files

Answer 22

Length, shape, cut