woods and metals and plastics

Question 1

2 types of soft woods and what type of three is this

Answer 1

-pine
-red wood
-deciduous
-grow quickly
-less dense
-cheap

Question 2

2 types of hard woods and what type of three is this

Answer 2

-mahogany
-beach
-evergreen
-expensive
-slow growing
-dense

Question 3

2 types of man made

Answer 3

-ply
-chipboard
-MDF - medium density fiberboard
made from left over pieces of wood stuck together

Question 4

adv of man made bourd

Answer 4

-comes in large sheets
-no natural defects

Question 5

dis of man made bourd

Answer 5

-edges need finished
-vener needed added to improve overall looks

Question 6

what are the components of ferrous metals

Answer 6

-rust
-magnetic
-contains iron

Question 7

examples of ferrous metals

Answer 7

-carbon steal
-stainless steel
-mild steal

Question 8

what are the components of non ferrous

Answer 8

-doesn’t rust
-not magnetic
-doesn’t contain iron

Question 9

examples of non ferrous

Answer 9

-brass
-copper
-aluminium

Question 10

properties of thermo plastics

Answer 10

heated and shaped multiple times

Question 11

examples of thermo plastics

Answer 11

-melemine
-polyestor resin
-epoxy resin

Question 12

properties of thermo setting plastic

Answer 12

plastics that can only be heated and shaped only once

Question 13

examples of thermo setting plastics

Answer 13

-acrilic ridged
-polyester
-nylon
-pvc

Question 14

what is tensile

Answer 14

pulling

Question 15

what is tersisih

Answer 15

pushing

Question 16

what is compression

Answer 16

compressing

Question 17

bending strength

Answer 17

bending

Question 18

what is hardness

Answer 18

the ability of the material to resist scratching from wear and tear bending and indenting

Question 19

what is brittle

Answer 19

not able to stand much stretching but will break rather than change shape

Question 20

what is toughness

Answer 20

this is the opposite of brittle it is the ability to resist breaking or shattering

Question 21

what is durability

Answer 21

to repeatedly with stand receded use wear and tear and corrosion attack

Question 22

what is ductile

Answer 22

the ability for a material to change shape
ussually streaching

Question 23

which material is the strongest in the world and some facts about it

Answer 23

-graphite
-thinnest in the world
-most conductive material
-it is almost transparent

Question 24

explain the process of heat treatment

Answer 24

-heat treatment is the change shape eating and cooling of metals to change their physical properties without letting it

Question 25

what are ferrous metals

Answer 25

-rusts -magnetic -contains iron

Question 26

what are no ferrous metals

Answer 26

-doesn't rust -not magnetic -doesn't contain iron

Question 27

describe what a but joint is

Answer 27

||______ ||-------- -jointed ends on -the glue is the only hold -weakest wood

Question 28

describe what a dowel joint is

Answer 28

-dowel added to the end for more support -use pillar drill to use the hole -add the dowel and glue joint

Question 29

describe what a mitre joint is

Answer 29

-cut at 45 degree angle -increases surface area to glue it -only for corners -stronger joint than butt

Question 30

describe what a housing joint is

Answer 30

-mainly used in shelving -cut a piece out so the other piece can sit in it

Question 31

what does permanent mean

Answer 31

cannot be undone without damaging the material

Question 32

what does semi permanent

Answer 32

can be done without damaging the material

Question 33

ways that you can join metals

Answer 33

-soldering -brazing -welding

Question 34

what are the steps of vacume forming and what its used for these are key point that your should know -hard strong surface -slope or strait lines mold has to be higher melting point than plastic

Answer 34

vacuum forming is to for food trays shop fitting and bath put the mold in the mashine put the plastic over the mashine make the mold tight heat the plastic raise the mold suck the air out wait till cool remove the mold

Question 35

what are the steps of blow molding

Answer 35

-parson inserted to the mold and then heated -base of parson squashed by mold -air blown into a parson expands to fill the mold -finish product

Question 36

what is press molding

Answer 36

-a mold is made by 2 halves sheet of plastics plastic is placed in 2 halves which are then heated and pressure is applied enabling the plastic to assume the shape

Question 37

what is laminating

Answer 37

wood is bent by laminating this is done by cutting thin strips of wood putting glue on strips and clamping then into mold -steam is used

Question 38

what is strength

Answer 38

The ability of a material to stand up to the force being applied without it bending breaking shattering or deformed in anyway

Question 39

what is hardness

Answer 39

the ability of a material to resist scratching from wear and tear bending and indenting

Question 40

what is brittleness

Answer 40

brittle materials cannot withstand much stretching they will break rather than change shape.

Question 41

what is toughness

Answer 41

this is the opposite of brittle it is the ability to resist breaking or shattering

Question 42

what is durability

Answer 42

the ability to withstand repeated use,weathering and corrosion attach

Question 43

what is ductility

Answer 43

the ability of a material to change shape (usually) stretching

Question 44

how to bend plastic

Answer 44

-mark bend with non permanent and a dashed line -line the bend line up with the wire of the line bender/strip heater -wait until plastic is soft -bend to desired angle -hold until cool

Question 45

how to bend metal

Answer 45

-mark bend line with a scriber and a dashed line -line up the bend with the folding bars on top of a vice -use scrap wood and a hammer to bend the metal to desire angle