Plasma Arc Cutting
- Components are drawn using CAD software.
- Exported as DXF file.
- Sent to a nesting program which arranges components in a way that creates least waste.
- Sheet metal is placed on the bed of the cutter.
- Design is cut out using a high heat plasma arc.
- Components are finished and ready for machining.
Sand Casting
- A metal box is partly filled with sand and resin.
- A shape made of wood or plastic is placed on to the first layer.
- The box is filled up with the rest of the resin and sand.
- The mixture is left to dry and the shape mould is taken out.
- Molten metal is poured into the mould and left to cool.
- The sand is taken away, leaving the shape formed in metal.
- The piece is now ready for polishing.

Metals are arranged into two groups:

Ferrous metals-

metals that contain iron and carbon. These metals will rust. (oxegenize)

Non ferrous metals-

Metals that do not contain iron. These metals do not rust.Ferrous metals:

Mild steel: Quite string and cheap but rusts easily and can't be hardened or tempered.

High carbon steel:

Harder than mild steel and can be hardened.Cast iron: Hard however brittle under impact.

Aluminium:

Lightweight and corosion resistant. Exspensive and not nearly as strong as steel.

Brass-

quite strong, corosion resistant maileable, ductile and looks good.

Copper-

Relatively soft malleable and ductile and a very good conductor of electricity.Most metals come from ores.

Wood is a fibrous material with fibers running the length of the wood.It's 55% cellulose and 28% lingin resin, which holds the structure together. Thins means that wood is classed as a 'natural fibre reinforced polymer

.4 stages of processing wood.
1. Harvisting - the cutting down of trees
2. Conversion - Cutting trunks and large branches into boards - Slab sawn or Quarter sawn
3. Seasoning - Releasing of the moisture content of the boards - Natural or kiln seasoning
4. Board preperation - sawing the boards to size and planing them e.g PAR (planed all round)

Slab sawn
Not much waste. Not very stable - likely to warp and twist. this is because the grain will want to form a straight line so it will bend in the opposite direction to the grain.
Quater sawn
More waste than slab sawn boards. More stable - less likely to warp and twist.Used for expensive hardwood timbers.Produce a more attractive grain.
Rough sawn timber
When timber is sawn it is measured in imperial units but once it gets planed it is measured in meteric units.
Edge Joints
Carpenters tend to edge joints of narrower timbers, alternating the direction of the grain, to produce wider, more stable boards.

Wood.

Lumbar - Freshly felled tree trunk

Wood - The material gained from Lumbar

Timber - Processed wood (material)

Hard woods-Comes from deciduous trees-Slow growing-More expensive than soft woods, due to time taken to grow.
Soft woods-Comes from coniferous trees-Relatively fast growing-Relatively cheap as they take less time to grow - Better land use.

You can tell the age of a tree by the number of 'age rings' (annual rings) in its trunk.Light rings signify summersDark rings signify autumn/winters - when a tree collects resin to just underneath the bark to protect the tree from the colder temperatures

as level chair design

I should never have purchased!

I should never have purchased!




Just last week I purchased a useful item that I believed would assist in the cleaning of my fabricated white shoes, on the label of the item the information expressed the capability of the shoe cleaner and how through following the instructions the shoes can be restored to there original form. This was a blatant lie. After one scrub on the white fabricated shoe not only had the stains engraved them selves further but they had also expanded across the shoe, making it harder and harder for the stains to be removed. I would not have purchased the item if I would have known that the shoes would only be stained further, but the examples and information clearly stated that the stains on fabricated shoes could be removed by applying the liquid and scrubbing. This item cost me four pounds and ninety nine pence, with this amount of money I could have found something far more practical and possibly would have still had change to spare. Because I have already opened the item and it has been used and exposed there is no way of me returning this item to the shop, and I personally believe that the shop was glad to get rid of such a useless item. If ever I find the need to get fabricated cleaning adhesive I will be sure to look around a lot more and not go back for the same product as before, I also plan to inform all of my friends on the uselessness of the item and advice for them to not go and get it them selves.