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8.1 Describe in detail the effectiveness of cutting fluid as compared to oil when turning a work piece on a centre lathe - NSC Mechanical Technology Fitting and Machining - Question 8 - 2017 - Paper 1
Question 8
8.1 Describe in detail the effectiveness of cutting fluid as compared to oil when turning a work piece on a centre lathe. 8.2 Describe what will happen if the engin... show full transcript
Worked Solution & Example Answer:8.1 Describe in detail the effectiveness of cutting fluid as compared to oil when turning a work piece on a centre lathe - NSC Mechanical Technology Fitting and Machining - Question 8 - 2017 - Paper 1
Step 1
Describe in detail the effectiveness of cutting fluid as compared to oil when turning a work piece on a centre lathe.
Answer
Cutting fluid plays a crucial role in machining operations, particularly in turning work pieces on a centre lathe. It prevents the shavings or metal chips from sticking and fusing to the cutting tool, which is essential for maintaining the tool's effectiveness. This is achieved through a lubrication mechanism that significantly reduces friction and heat.
Additionally, cutting fluid carries away heat generated during the turning process, which helps in prolonging the lifespan of both the tool and the work piece. It also flushes away shavings and metal chips, ensuring a cleaner working environment and better visibility. Importantly, cutting fluid improves the quality of the finish on the turned surface, leading to better mechanical properties and surface integrity.
Step 2
Describe what will happen if the engine oil in a vehicle is not changed regularly.
Answer
Failing to change the engine oil regularly can lead to the formation of harmful substances such as gum, acids, and lacquer. These materials accumulate and can coat the internal surfaces of the engine, which negatively affects performance. The oil loses its viscosity over time, hindering its ability to efficiently transfer heat and protect engine components.
Moreover, metal particles can deposit in the oil due to wear and tear, potentially leading to serious engine damage. Ultimately, neglecting regular oil changes can result in reduced engine efficiency, increased friction, and even catastrophic engine failure.
Step 3
Step 4
Name THREE properties of grease.
Answer
- Grease must be water-resistant and should not mix with water.
- It should be rust and corrosion resistant, ensuring longevity in application.
- Grease should possess a high melting point and a low freezing point to maintain its consistency and performance across varying temperatures.
Step 5
State TWO functions of a clutch plate and pressure plate in the clutch and pressure plate assembly.
Answer
- To provide friction between the clutch and pressure plate, allowing for smooth engagement and disengagement.
- To connect the flywheel to the gearbox shaft, facilitating the transfer of power from the engine to the transmission.