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4 Sep 2001: Design a test to rank various materials in order of their wear resistance. ... Tip: use a very strong material to slide against your test materials.

4 Sep 2001: Devise a test to compare the impact resistance of different polymers like polystyrene foam, PMMA (also known as Perspex) and polyethylene.

4 Sep 2001: Design a test to see how long polymers can be held above their maximum service temperature.

4 Sep 2001: Devise a test for comparing the tear resistance of different fabrics.

4 Sep 2001: 1,140. 616. Alloy Steel. 210. 7,800. 1,330. Collect samples of many different types of rubber bands and test the amount of elongation before failure.

8 Sep 2001: Economics. Milling machines vary in price from £1,000 to £1,000,000. Milling is generally a very slow way to produce a component - but it can be economic for prototyping

8 Sep 2001: Economics. The machinery is expensive, and can cost well over £100,000 for HIPing. ... Because there is little competition, can be economic for small batches (1,000+) - although still not cheap!

4 Sep 2001: It is not economic to use standard processes such as turning - so another approach is needed.

8 Sep 2001: Economics. For making stock items, rolling has few competitors.For this reason, it is usually performed by the foundries before passing on to customers for further processing. ... For long shaped sections, rolling is the only viable option for larger

8 Sep 2001: However, the production rate is slow so it is only economic for one-off jobs, repair work and difficult access situations. ... Joining of sheet (e.g. car body panels) is usually more economic by other welding processes such as spot welding.