ZIMSEC · O Level · Syllabus 4055
Metal Technology and Design
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Form 1 4 topics
- Workshop safety Overalls, safety boots, goggles or a face shield (grinding, drilling, welding), leather gloves and apron for hot work, welding helmet with the correct filter lens, and ear protection near noisy machines.
- Metals, alloys and their properties Mixtures of metals (or a metal with another element): brass (copper and zinc), bronze (copper and tin), solder (tin with other metals), duralumin (aluminium alloy).
- Marking out and measuring Coat with marking blue (or chalk on rough surfaces) so scribed lines show clearly.
- Cutting, filing, drilling and threading The hacksaw blade's teeth point forward (cuts on the push stroke). Use fine teeth (32 per 25 mm) for thin sheet and tube, coarser (18 per 25 mm) for thick bar. At least three teeth should touch the work. Tin snips cut thin sheet metal.