Photo AI
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 fluids play a crucial role in machining operations by providing several advantages over oil:
-
Prevention of Metal Chips Sticking: Cutting fluid effectively prevents shavings or chips from sticking and fusing to the cutting tool, which enhances the machining process.
-
Heat Removal: The fluid carries heat away from the turning surface, generated during the machining operation, which helps to lower tool wear and improve tool life.
-
Surface Finish Improvement: It helps to flush away metal shavings and improves the quality of the finish on the turned surface. The cooling effect also aids in achieving tighter tolerances.
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 severe consequences, including:
-
Formation of Deposits: Over time, gum, acids, and lacquer can form, coating the internal surfaces and reducing lubrication efficiency.
-
Reduced Viscosity: The oil may lose its viscosity, causing excessive heat transfer which results in friction in the lubrication, leading to significant engine wear.
-
Metal Contamination: Metal particles may deposit in the oil, resulting in increased wear on engine components due to inadequate lubrication.
Step 3
Step 4
Name THREE properties of grease.
Answer
Grease possesses several critical properties:
- Water Resistance: It must remain effective in the presence of water and must not mix with it.
- Rust/Corrosion Resistance: Grease should protect surfaces from rust and corrosion.
- High Melting Point: It must maintain its integrity at high temperatures, ensuring effective lubrication even under high stress or temperature conditions.
Step 5
State TWO functions of a clutch plate and pressure plate in the clutch and pressure plate assembly.
Answer
- Provide Friction: The clutch plate and pressure plate work together to provide the necessary friction for engaging and disengaging the engine from the drivetrain.
- Connect the Flywheel to the Gearbox Shaft: They facilitate the connection of the flywheel to the gearbox shaft, allowing for smooth gear shifts and transmission of power.