ZIMSEC O Level · Metal Technology and Design · Form 1
Personal protection
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.
General rules
- No loose clothing, jewellery or long hair near machines.
- Use machines only with permission and with guards in place.
- Clamp work securely before drilling; never hold small pieces by hand.
- Remove chuck keys before switching on.
- Never use compressed air to clean clothes or skin.
Hot work
Treat all metal as hot; use tongs; keep a fire extinguisher and sand bucket nearby; store gas cylinders upright and chained; check hoses for leaks with soapy water, never a flame.
Burrs and swarf
Remove sharp burrs with a file; clear swarf with a brush, not your hands.
Exam tip: Link each safety rule to the hazard it prevents (e.g. goggles – flying particles when grinding).
Check yourself
- Why must the chuck key be removed before switching on a drill?
- How should gas welding hoses be tested for leaks?
- How should swarf be removed from a machine?
Show answers
- It would be thrown out at speed and could injure someone.
- With soapy water – bubbles show a leak (never a flame).
- With a brush (never bare hands or compressed air at people).
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