Define preventative maintenance.
Why is it important to ensure that a machine is switched off and locked out when doing maintenance on belt drives?
What is clutch-... show full transcript
Worked Solution & Example Answer:Define preventative maintenance - NSC Mechanical Technology Automotive - Question 8 - 2017 - Paper 1
Step 1
Define preventative maintenance.
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Answer
Preventative maintenance can be described as the maintenance of equipment or systems prior to the occurrence of a fault. This proactive approach helps maintain efficiency and extends the lifespan of machinery.
Step 2
Why is it important to ensure that a machine is switched off and locked out when doing maintenance on belt drives?
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Answer
It is crucial to switch off and lock out a machine during maintenance to prevent accidental activation. This ensures the safety of maintenance personnel by eliminating the risk of injury caused by unintended machine start-up.
Step 3
What is clutch-pedal free play?
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Clutch-pedal free play is defined as the distance the clutch pedal can be pressed down before it engages the clutch mechanism. It is the initial movement of the pedal before the engagement of the clutch linkage and release bearing.
Step 4
What is meant by the term viscosity index?
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The viscosity index refers to a measure of how much the viscosity of an oil changes in response to variations in temperature. A higher viscosity index indicates that the oil maintains a more stable viscosity across a range of temperatures.
Step 5
Give TWO reasons why the clutch plate in a motor vehicle's clutch assembly is replaced.
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Answer
Worn friction linings can lead to poor clutch performance, necessitating replacement.
Weak or broken springs can cause engagement issues, which also requires a replacement of the clutch plate.
Step 6
Why does grease have a very high viscosity?
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Grease typically exhibits high viscosity to ensure that it adheres well to the bearing surfaces, providing effective lubrication and reducing the likelihood of wear and tear in machinery.
Step 7
What is cutting fluid?
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Answer
Cutting fluid is a lubricant used during machining processes, primarily made up of a mixture of soluble oil and water. It aids in cooling the cutting tool and workpiece while reducing friction.
Step 8
Give a reason why the viscosity of a cutting fluid should be low.
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Answer
A lower viscosity in cutting fluid allows for easier flow, which is essential for effective cooling and the dissipation of excess heat during machining operations.
