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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 Automotive - 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 Automotive - 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 processes, especially when using a centre lathe. It is more effective than standard oil for several reasons:
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Chip Removal: Cutting fluid helps prevent the shavings or metal chips from sticking and fusing to the cutting tool. This is vital as it keeps the tool and workpiece clean, leading to smoother operations.
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Heat Management: It carries away the heat generated during the turning process, minimizing temperature rise which can adversely affect both the workpiece and tool lifespan.
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Surface Finish: The introduction of cutting fluid improves the quality of the finish on the turned surface, reducing the need for additional finishing processes.
These advantages make cutting fluids essential in maintaining tool efficiency and workpiece integrity.
Step 2
Describe what will happen if the engine oil in a vehicle is not changed regularly.
Answer
Failing to change engine oil at regular intervals can have several negative impacts:
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Gum and Sludge Formation: Over time, engine oil can accumulate gum, acids, and lacquer, which can coat engine components, leading to reduced lubrication efficiency.
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Viscosity Loss: Oil loses its viscosity, leading to ineffective lubrication which increases friction and wear on engine parts.
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Metal Deposits: As oil degrades, it can deposit metal particles from the engine into the oil, exacerbating wear and potential damage to the engine.
In summary, neglecting regular oil changes can significantly diminish engine performance and longevity.
Step 3
Step 4
Name THREE properties of grease.
Answer
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Water Resistance: Grease must be resistant to water to maintain its effectiveness in lubrication.
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Rust/Corrosion Resistance: It is essential for grease to inhibit rust and corrosion to protect mechanical parts.
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High Melting Point: Grease should have a high melting point to withstand elevated temperatures without losing its properties.
Step 5
State TWO functions of a clutch plate and pressure plate in the clutch and pressure plate assembly.
Answer
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Friction Generation: The clutch plate provides the necessary friction between it and the pressure plate to engage or disengage power from the engine to the transmission.
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Connection of Flywheel: The pressure plate connects the flywheel to the gearbox shaft, allowing for efficient power transfer.