dt test

List of sources and origins

Amazonian forests

What is found in Alpine forests?

Pine

What is found in European forests?

Birch

What is found in Amazonian forests?

Mahogany

Impact of logging on communities

Brings money and jobs to the area

Social footprint of timbers

Impact of logging on communities

Ecological footprint of timbers (life cycle)

1. Sustainability: Hardwoods not sustainable as take long time to grow. Softwoods are quick growing so are sustainable as when they are cut down they can be replanted

Pre stressed construction beams

Stretching (pre stressing) construction beams means that they will stretch less when a beam is loaded so stronger

Reinforcement and stiffening techniques

1. Frame structures - putting a thin panel inside the frame, adding a diagonal strut or triangle across each of the corners,

Assembly and fabrication processes

Fabrication process - used to make parts for something

Cross sectional area calculation

Width x thickness

PAR and PSE

PAR (planed as round): All four surfaces have been planed with slightly rounded edges to make it easier and safer to handle

PSE (planed square edge): All four surfaces are planed but the edges are left square e.g. joinery timber

Stock forms/ sizes

Regular sections

Bag press

Bag that can be sealed and have air sucked out of it

Mortiser

Creates a square hole

Fixture

Hold the workpiece in place whilst it is being cut or shaped

Jig

Can be put over a piece of work and guide a drill or saw in the required place

Pros of a subassembly

Can be replaced entirely

Tolerance

The amount by which a measurement can vary without affecting the ability of the product to be manufactured accurately

Flat drill bit

Forstner drill bit

Auger drill bit

Can bore deep holes

Hole saw drill bit

Only good for quite thin materials

Coping saw

Tenon saw

Types of screw

List of wood joints

Butt

Mortise and tenon joint

Cam lock fitting

Knock down fittings

A type of fitting that can be put together easily by using basic tools, often used in flat-pack furniture

List of hinges

Butt hinge

Flush hinge

Leaves a gap between door and frame but easy to fit

Butt hinge

Hidden when door is closed but hard to fit

Butterfly hinge

Whole hinge shows on surface but easy to fit

T hinge

Shows on front of gate or door but long bar is good for supporting weight

Ironmongery

Name for a range of parts that can be bought to go onto products:

The way in which the following selection of each natural and manufactured timber is influenced: aesthetic factors

Form - overall shape and structure

The way in which the following selection of each natural and manufactured timber is influenced: environmental factors

Sustainability

The way in which the following selection of each natural and manufactured timber is influenced: availability factors

Use of stock materials - materials sold in standard sizes. Saves time as saves lots of wasted timber

The way in which the following selection of each natural and manufactured timber is influenced: cost factors

Quality of material - knots, how it is cut, properties

The way in which the following selection of each natural and manufactured timber is influenced: social factors

Use for different social groups - what appeals to the different groups and what they can afford

The way in which the following selection of each natural and manufactured timber is influenced: cultural and ethical factors

Avoiding offence - understanding different cultures means you don't accidentally use something offensive that would prevent them buying the product

Impact of technologies on: industry

Low skilled jobs can be replaced by automation and robotics leading to unemployment

Impact of technologies on: enterprise

Crowd funding

Impact of technologies on: sustainability

Transport costs - modern vehicles and improved engines means less fuel consumption so transport costs will be lower

Impact of technologies on: people

Workforce - technology means they can reduce costs for businesses as less office space needed and work from home but work life and home life might damage productivity

Impact of technologies on: culture

Population movement within the EU - immigrants bring energy, innovation and experience of different skills however internet might reduce the need for workers to move

Impact of technologies on: society

Change in working hours and shift patterns - remote working means it easily to change hours to suit personal needs but might lead to decreased efficiency

Impact of technologies on: environment

Pollution - firms to comply with legislation

Internet of things

Products connected together via internet

Standardised design and components

When the manufacturer uses the same component over a number of products

Lean manufacturing

Reducing or eliminating waste in design, manufacturing, distribution and customers services

Critically evaluating new and emerging technologies that inform design decisions

Budget constraints

Consideration of contemporary and potential future scenarios

Natural disasters - technology allows us to predict weather patterns and enables better designs e.g. earthquake proof

Ethical perspectives when evaluating new and emerging technologies

Where it was made

Environmental perspectives when evaluating new and emerging technology

Use of materials

Linear movement

Reciprocating movement

Rotary movement

Oscillating movement

Mechanical advantage

Reverse motion linkage

Bell crank linkage

Cam followers

Cams

Pear shaped, drop/ snail, eccentric/ circular

Velocity ratio in pulley system

Driven pulley diameter/ driver pulley diameter

Input/ output speeds in a pulley system

Output speed = input speed/ velocity ratio

Cranks and sliders

Distance moved by the slider is twice the radius movement of the crank arm.

Simple gear trains velocity ratio

Velocity ratio = number of teeth on driven gear/ number of teeth on a driver gear

Compound gear trains velocity ratio

VR of gear train x VR of gear train

Idler gear

Bevel gears

Rack and pinion gears

Uses a gear wheel and rack to change rotatory motion to linear motion or vice versa

RPM calculations

Number of time the device rotates around a fixed axis in one minute

Sensors

Light dependant resistor

Control devices and components

Switch

Output devices

Buzzer

Fairtrade

Tackles poverty and injustice across the world

Communication methods

Check physical flashcards on this

Warp knitted

Weft knitted fabric

Non-woven materials

Woven fabrics

Plain weave - calico (one under, one over)

Synthetic fibres

Artificial - usually made using coal, oil and other petrol based chemicals

Natural fibres

• Cotton

Thermoforming polymers

A materials that can be reshaped by application of heat. Can be recycled and made into other products

Thermosetting polymers

A materials that cannot be reshaped by reheating. Cannot be recycled

Boards

GSM is more than 220 (grams per square meter)

Paper

• Copier

Ferrous metals

Contains iron

Non ferrous metals

Doesn't contain iron