P1 Revision Flashcards
What should be considered when selecting a material (6)
Functional requirements
Cost
Manufacturing demands
Environment
Availability (of sizes)
Joining methods
List forms wood can be bought in
Rough sawn
Standard lengths
List forms metal can be bought in
Sheet
H / I beam
Pipe
Angle
Plasticity
Ability to be shaped
Density
Mass of 1cm^3
Benefits of Plastic coating/ painting on metal
Long term corrosion resistance
Increases durability
What is anodising metal
Natural oxide film that grows on some metals. Mixed with electrolytes produces thick coating
What is lacquering
Clear/coloured metal varnish
Melamine formaldehyde properties and uses
Hard strong
Used to laminate floors and tables
Epoxy resins properties and uses
Chemical / heat resistant
Coating / adhesive
LCDs properties and uses
Light modulating crystals
Calculator display screen
Wasting
Cutting away at material until desired shape is found
Fabrication
Joining separate pieces of materials
Rolling
Fabrication of metal by passing it through a pair of rolls
Blanking
Punch and die are used to stamp out a shape
Coins
Press forming
Large forces used to squeeze polymer into shape between moulds
Forging
Shaping metal using compressive forces
Blow moulding
Plastic is melted and sent to die where compressed air forces it into shape
Sand casting
Molten metal is poured into sand through gap that leads to mould
Pressure die casting
Piston forces molten metal into die where it is moulded
Factor of safety
Guarantees the product will withstand forces up to the stated margin (and can withstand more)
lift example
Tolerance
Accepted degree to which a component may vary in size
Inspection
Examination of product to determine whether it meets standards
Synthetic resins
Thick liquid that hardens making wood water proof and corrosion resistant
Flat rolling v profile rolling
Sheets produced v round rod/shaped bar
