4.1 Identify the tool - NSC Civil Technology Woodworking - Question 4 - 2020 - Paper 1

If no personal safety equipment is worn, the operator may face various hazards. Dust and debris can enter the eyes, leading to injuries. Moreover, inhaling dust can damage the lungs, while loose clothing could get caught in the moving parts of the machine, potentially causing serious injuries.

This hand tool should be stored in a safe, dry place to prevent damage from corrosion, rust, or exposure to moisture. These elements can impair the functionality of the tool and pose safety risks during its next use.

Adjusting the height of the table while the thickness planer is in operation can lead to several issues. It can cause injury to the operator, as the machine may become unbalanced. Additionally, it can jam the wood, creating a safety hazard, and may cause unnecessary strain on the machine, resulting in potential damage.

To maximise the use of the blades, it is essential to ensure that the timber is free from metal objects before starting the machine. Regular maintenance of the blades is crucial, ensuring they are sharpened and fastened correctly.

For tiled roofs, the underlays include:

• Polypropylene membrane
• Plastic membrane

For thatch roofs, the underlays may include:

• Aluminium foil or fireproof material
• Synthetic/plastic membranes

For IBR roof sheeting, appropriate underlays are:

• Synthetic plastic membrane
• Waterproofing membranes

In the top view, ensure that the inclined roofs are drawn with an intersection to create a valley at the center. The inclined roof on top should overlap the valley intersection.

Closing an open eave improves the aesthetic appearance of the roof, providing a neater finish and preventing birds from nesting in the roof space.

Fibre-cement ceiling board is preferable for closed eaves as it is water-resistant and does not sag in humid conditions unlike gypsum ceiling board, which can warp under moisture.

Disadvantages of concrete roof tiles include:

• They are prone to chemical weathering, leading to deterioration over time.
• Their weight makes installation more challenging compared to lighter materials.

Disadvantages of thatch roofs involve:

• They require regular maintenance to prevent decay and need re-thatching every few years.
• They are more susceptible to fire hazards and must be treated with proof chemicals.

Disadvantages of corrugated iron sheeting include:

• They can have sharp edges, posing injury risks during handling.
• If not properly installed, they can rust along cut edges, leading to leaks.

The framework of a trapdoor should be secured to:

• The tie beam of the roof structure.
• The brandering to provide adequate support.

Mechanically graded timber ensures consistent quality, offering predictable strength properties, which significantly reduces the risk of structural failure compared to visually graded timber, which can have variable strength and quality.

Timber must be preserved to:

• Prevent fungal growth and insect infestation, which can compromise its integrity.
• Extend its lifespan by protecting it against decay caused by environmental factors such as moisture and UV exposure.

Ensure that the dimensions are accurately represented in the drawing. Start from the indicated lines, drawing the king post at 114 x 38 mm and accurately representing the wall plates and tie beam.