Term 2- Half Yearly Exam Flashcards
Uses of Particleboard?
Kitchen doors, fire doors, mostly internal uses e.g. shelving
Sources of Particleboard?
Glued together wood particles, from trimming with an adhesive and under heat and pressure, from strong grainless sheets
Disadvantages of particleboard?
All grades except high density tend to soak up water, swell and breakdown
Sources of MDF?
Hardboard made from wood fibres glued together under heat and pressure.
Advantages of MDF
Dense, stiff, no knots, easily machined
Disadvantages of MDF
Contain urea formaldehyde maybe released through cutting and sanding.
Uses of MDF
Display cabinets, wall-panels, storage units
Sources of plywood
Laminating odd numbers of thin veneered arranged with grain direction at right angles, alternating layers
Advantages of plywood
Strong, the more veneers used the stronger it becomes
Uses of Plywood
Interior and exterior, wall panelling, furniture
Sources of hardboard
Eucalypt chips are pulped with water and spread on a mat on a moving wire mesh screen. Mats compressed forming tough, dense sheets
Advantages of hardboard
3 types available
Disadvantages of hardboard
Cannot be used outside
Uses of hardboard
Cheaper option than plywood, cupboard backs, drawer bottoms
What are some edge treatments
Plastic laminates bonded to particle board
What is a veneer
A thin layer of real wood applied to substrate material. Provide outward aesthetics of solid wood.
What is marine ply?
Type of plywood bonded with waterproof adhesive used in boat hulls
What is Melamine wood
Less expensive alternative to wood, made up of core particle board or MDF bonded with melamine resin
What are manufactured boards used for?
Kitchen cupboards, cabinets, counters, shelving
Changes brought about by introduction of manufactured boards?
- Furniture manufacture became less labour intensive, therefore cheaper.
- Mass production of furniture increased
- CNC machines developed to facilitate mass production process.
What is knock-down furniture?
Usually made from mass produced panels which can be assembled in various arrangements to create a range of different units.
What is flat pack furniture?
A piece of furniture or equipment that is sold in pieces packed flat in a box for easy transport and assembled by the buyer.
Compare furniture of the past to furniture of today
Furniture of past- handmade, intricate designs, expensive timber,
Furniture of today- made by machines, simple, cheap timber
What is a cnc laser cutter
Cutting things controlled by a computer
What is a cnc router?
Similar to manual router, designed by computer, sent to router for hard copy with precision and accuracy in cuts.
Use of Butt Hinge
Traditional cabinet door hinges, mainly used on cabinets. Shows only knuckle of hinge when door is shut
Use of recessed hinge
Used in similar situations to butt hinge except not let into door carcass. One leaf fits into recess of other leaf when door is closed
Use of flap hinge
Open 180* used where door or flap opens into horizontal position.
Use of continuous or piano hinge
Screwed in along full length, used in situation where butt hinge not provide sufficient strength
Use of reflex hinge
Used where opening angle more than 180* is required.
Use of concealed hinge
Most common cabinet hinge, many different types and opening angles
Use of d handle
Used on cupboard doors and drawers
Use of knob
Used on drawers as well as doors
Use of flush pull
Designed for sliding doors, let in flush with surface of drawer
Part of catches
Striker- fitted to door
Retainer- fitted to inside of carcase or under side of shelf
Use of ball catch
Available as single or twin ball catch, retaining pressure adjustable
Use of magnetic catch
Generally made from plastic with steel plate attached to striker and rigid magnet attached to retainer
Single extending draw runner
Do not extend full depth of drawer
Fully extending drawer runner
Have an extra telescopic extension allows drawer to extend
Issues with forest clearing
Forests produce oxygen we breathe as leaves absorb CO2
Destruction natural habitat for animals
Land degradation and erosion
Climate Change
Environmental Impacts- Manufacturing
Cost of material will increase, reduction in supplies
Supply of materials need to be managed well
Imported timbers can be cheaper not good for local economy
Improve milling and selection techniques reduced waste
Environmental Impacts- Timber
Reforestation- continued replanting of forest
Plantation Farming- farming of trees as long term commercial crop
Environmental impacts- individual
Air quality
Noise Pollution
Industrial Waste
Factors affecting quality of assembly
Quality of the Work
Working Time
Efficiency
What Face marks should be used
Face edge- outer side of project
Face side and edge marks- two best surfaces
Working time of PVA glue
10 minutes
Why dies end grain require two coats of wood
First coat absorbed leaving little at contact surface for adhesion
What position are the rails when cramping
Should be parallel to rails. Waste blocks used to protect edges
When apply clamps
Keep things flat two underside one upper of not pressure might cause boards to bow upwards
Ways of checking a job is square
Testing with try square
Diagonals, regular frames / carcases
What is wind
Wind refers to the flatness of a board or frame
If a frame is in wind, it means
Surfaces are twisted, sometimes due to seasoning process
