DT theory

wood turning on a wood lathe

complex plastic products

injection molding

very little detail, for shell

Vacuum forming

ABS

very tough plastic, heat resistant, used for injection molding.

Only for hollow bottles, polyethylene

Blow molding

HDPE

High density polyethylene

Advantages of stainless steel

Waterproof and doesn't corrode

How are metal toys made?

die cast with aluminum alloy

PVC

poly vinyl chloride

What is plastic extrusion

Produces the plastic longer in shape

What does GRP stand for and what are the advantages?

glass reinforced plastic, lightweight and water resistant.

What is Photochromic?

\Smart material that responds to light

What is Thermochromic?

Smart material that responds to temperature

What is hydrochromic?

Smart material that responds to water

CFRP - Carbon fibre reinforced plastic, what are the advantages?

High strength to weight ratio, expensive but high quality finish

What is Kevlar?

Layers of woven kevlar are combined with layers of resin, resistant to abrasions and has high tensile strength.

What is a polymorph?

Can be shaped and reshaped unlimited times, Changes form at 62 degrees.

SMA - Shape memory alloy

Items that will return to original shape after bent.

divider

measuring circles on metal; centre punch to locate the centre.

An advantage of melamine?

Good against heat

Sash clamps for bigger or smaller materials?

Bigger materials

What are chipboards?

with plastic laminate over it, very cheap.

What is a coping saw?

type of handsaw that's used to cut curved lines or shapes

What is a marking gauge used for?

To mark parallel lines WOOD only.

How are flat laminate made?

solid wood board glued together

What is a hand plane used for?

to flatten and smoothen wood

What is the manufacture method for metal?

die casting

mortise and tenon joint

Dowel joint

through housing joint

finger joint

rebate joint

biscuit joint

dovetail joint

mitre joint

purpose of metal finishing

To protect from corrosion and to enhance aesthetics.

single cut file

double cut file

curved tooth

Rasp File

2 metal finishes.

powder dip coating and spray paint.

What are some irregular metal shapes.

angle, channel, hexagonal and octagonal

What are tee hinges used for?

used on gates, doors.

purpose of groves of a joint.

increase surface area for glue

odd leg caliper

To mark parallel lines METAL only.

Marking Knife

To mark and cut grain to prevent splintering during chiselling.

Adjustable bevel square

Used to mark out any angle and to check angles on objects and machines. WOOD and ACRYLIC only.

Mitre square

Used to mark out 45°/135° angles on WOOD and ACRYLIC only.

External calipers

Used to measure and check external distance of an object.

Internal calipers

Measures and checks the internal distance of an object.

Combination square

Marks 45 and 90 degree angles, METAL and ACRYLIC only. Includes a spirit level to check is something is level or flat.

Micrometer

Measures thickness very precisely, ANY materials.

Vernier caliper

To precisely measure internal and external dimensions, ANY materials.

Template

Used to work on repeat shapes quickly and accurately on WOOD, METAL and ACRYLIC. Prevents splintering during chiselling.

2 types of metals

ferrous and non-ferrous

Ferrous metals

metals that contain iron and are mostly magnetic.

Non-ferrous

Does not have iron, pure metals.

What is an alloy and the advantages?

It is a mixture of metals, it improves their properties and makes them more useful.

An example of an alloy.

Stainless steel, corrosion and chemical resistant.

Ergonomics for specification

Lightweight, easy to use, comfortable to hold and minimal effort to operate.

Anthropometrics for specification

Appropriate size, height for the client/TMG. Adjustable for different users.

Safety for specification

No small parts, non-toxic, easy to clean so hygienic.

Durability for specification

Will last a long time, strong and durable construction, abrasion resistant materials and impact resistant.

Style/Aesthetics for specification

Attractive to the client/TMG, colourful and appealing.

2 advantages of hardwoods

More durable and harder. More attractive grain.

An advantage of softwoods.

Cheaper.

5 stock forms of wood.

Board/Plank, square section, dowel, manufacture boards and moulding.

4 common faults that could happen if not seasoned?

Split, cup, bow and twist.

What happens if the grain end rings are all facing the same direction?

Causes cupping.

Oak (Hardwood)

Tough and durable, stylish and attractive grain. FURNITURE.

Teak (hardwood)

Resistant to rot and moisture, it has natural OIL content. Tough, durable and GOOD for outdoors.

Beech (hardwood)

Does NOT SPLINTER easily, safe to use. Dense grain, hard and durable. Toys/tough furniture/kitchen cutting surfaces.

Larch (softwood)

Cheap and easily available. Durable, high natural resin that resists rot and water. Fences.

Scots pine (softwood)

Cheaper, fast growing. Quite strong, lightweight and durable. Furniture.

2 groups of plastics

thermoplastics and thermosetting plastics

Where are plastics made from

CRUDE OIL.

4 advantages of manufactured boards.

Very strong - alternating grains

Environmental friendly - Uses wood waste usefully and no burning.

Comes in large sheets - convenient for manufacture

Cheaper than solid wood.

1 disadvantage of all manufactured boards except marine plywood.

Not durable in wet environments.

What does KDF stand for?

Knock down fittings

3 reasons for applying finish to materials.

1. Protect the material from moisture and abrasion.

2. To change the materials appearance, its colour and texture.

3. To enhance the materials durability.

A wood finish for outdoors and in wet environments.

Teak oil.

What is the main purpose of a wood stain?

To improve the colour of the wood and help to show the grain.

Best and most protective finish for a dining table?

Varnishes and lacquers.

5 advantages of KDF

Standard components - cheap.

Easy to assemble and disassemble

Convenient as no glue - not permanent.

Cheaper - customer assembles, no factory productions.

Simple tools

Disadvantages of plastics?

Causes landfill which takes up space.

Creates leachates - toxic and damages ecosystems.

Microplastics stay in the water forever.

Examples of thermoplastics

Toys, food packaging, consumer electronics and bottles.

Are thermoplastics recyclable?

YES - can be re-melted and turned into something else. Thermoplastics have recycling symbols.

Advantages of thermosetting plastics

electrical insulator, heat resistant, hard and tough. Water and corrosion resistant.

Examples of thermosetting plastics

Light switches and plug sockets.

Are thermosetting plastics recyclable?

HARD - it turns black when burnt and unable to melt.