Stock Forms and Standarc Components

Question 1

Timber

Answer 1

Timber comes in different sizes, eg planks and strips. They are standard lengths eg 47x100x2400mm
PSE timber has the rouch edges cut off to give it smooth edges and sharp corners
Rough sawn timber is left rough after cutting, this makes it cheaper
Mouldings are strips that come in cross sections, used for skirting boards or door frames
Manufactured boards are made in 2440x1220mm sheets, with common thicknesses from 2-18mm

Question 2

Metals

Answer 2

Metals come in a variety of shapes and sizes too:
Sheet, strip, bar, rod, tube, angle, u-shaped channel, I-shaped girder

This means manufacturers can buy the exact lengths needed.

They are available in a variety of different thicknesses, widths and lengths and diamiters

Question 3

Polymers

Answer 3

Sheets and tubes and rods can be used in drape forming, and can be cut to the correct sizes
Foam is used as packing or to create models
Films are good for vacuum forming and packaging
Granules can be mented, then cast or moulded
Powders can be 3d printed, or as coatings

Question 4

Screws and Bolts

Answer 4

Screws, nuts and bolts are temporary ways of joining things together- you can take them apart if you want to
Made from steel, brass or stainless steel, ‘self finished’ with zinc brass or chrome
Important to use the correct fixing to make the product look nice and keep it together

Screws:
Screw Threads grip the material making a tight fixing in metal or plastic, has a wide varitey of uses
Woodscrews often need pilot holes to be drilled first. the screw can then be tightened and it pulls into the wood, there are different types of head available for these screws
Self-drilling-screws have hardened threads and a tip like a drill bit. This means they need no pilot hole, used in metals and hard plastics
Machine Screws have a straight threaded shank and use washers and nuts in a hole with matching threads. Often used to join bits of metal.

Nuts and bolts:
Used to join thin materials like sheets of metal or plastic
only useful if you can access both sides of the material
Used in machinery, bridges and cars to hold moving parts.
Bolts are similar to machine screws but have a hexagonal head needing a spanner to tighten