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

If no personal safety equipment is worn while operating the belt sander, the operator may face several risks. Dust and debris can cause eye injuries, which may lead to impaired vision. Additionally, inhaling dust can damage the lungs over time, leading to respiratory issues. Moreover, body injuries can occur, especially if loose clothing becomes snagged in the machine's moving parts, potentially causing harm.

The belt sander should be stored in a safe, dry place to prevent moisture damage, which can lead to rust and other forms of corrosion affecting the tool's components. Additionally, storing it in an organized manner reduces the risk of accidents or damage to the tool and ensures that it remains in good working condition for future use.

Adjusting the height of the table on the thickness planer while it is in operation can be dangerous. It may cause a sudden change in the cutting depth, which could lead to kickback, throwing the workpiece unexpectedly. This action can also cause injury to the operator or damage the machine. Furthermore, it can lead to an inconsistent finish on the workpiece as the height adjustment can interfere with the normal operation of the blades.

To maximise the use of the blades in the thickness planer, it is essential to ensure that the blades are kept sharp and free from any debris or material buildup. Regularly inspecting and maintaining the blades, including correctly tightening them before operation, is important. Additionally, operators should avoid forcing irregularly shaped wood through the machine, as this can cause blunting or damage to the blades.

4.3.1 Tiled roofs: Polypropylene/Plastic membrane, sarking felt. 4.3.2 Thatch roofs: Aluminium foil or other fireproof material. Thatch should be treated with fireproof chemicals before use. 4.3.3 IBR roof sheeting: A synthetic/plastic membrane or material waterproofing membrane.

This task requires a drawing of a roof section showing the valley where the two inclined roofs meet. The diagram should clearly illustrate the shapes of the roofs, the valley, and the orientation of the inclines based on typical structural practices.

One reason to close an open eave is to provide a more attractive finish to the building's exterior. Additionally, closing the eave helps prevent birds from nesting in the roof space, which can lead to other problems, such as damage to materials and increased maintenance.

Fibre-cement ceiling board is preferred over gypsum ceiling board for closed eaves because it is water-resistant and more durable under fluctuating environmental conditions. This quality makes it less susceptible to moisture damage, mold, and mildew, which are critical concerns in eave applications.

4.7.1 Concrete roof tiles:

• They are prone to chemical weathering, which can reduce their lifespan.
• They are heavier than most other roofing materials, necessitating additional structural support.

4.7.2 Thatch roofs:

• Thatch requires regular maintenance and re-thatching, usually every four to six years.
• They are more susceptible to decay, given that they are made from organic materials.

4.7.3 Corrugated iron sheeting:

• Sharp edges can pose a danger during handling and installation.
• Sheets may bend when stepped on if not supported properly.

1. Tie beam
2. Branding.

Mechanically graded timber is preferred because it provides a reliable indication of quality and strength, which involves testing machines for consistency. This grading method ensures that the timber meets specific load-bearing standards, reducing the risk of structural failure. Additionally, it is often more readily available and less time-consuming to procure.

1. To prevent fungal growth and deterioration of the timber, which can weaken its structural integrity.
2. To extend the lifespan of the timber by making it resistant to moisture, heat, stains, and scratches, thereby maintaining its aesthetics and functionality.

This task involves drawing a scaled diagram of a king post roof truss according to the specifications provided on the answer sheet. The drawing should include detailed measurements and conform to the required scale, ensuring accuracy and adherence to the drawing guidelines.