8.1 Define preventative maintenance - NSC Mechanical Technology Welding and Metalwork - Question 8 - 2017 - Paper 1
Question 8
8.1 Define preventative maintenance.
8.2 Why is it important to ensure that a machine is switched off and locked out when doing maintenance on belt drives?
8.3 Wha... show full transcript
Worked Solution & Example Answer:8.1 Define preventative maintenance - NSC Mechanical Technology Welding and Metalwork - Question 8 - 2017 - Paper 1
Step 1
Define preventative maintenance.
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Answer
Preventative maintenance can be described as the routine maintenance of equipment or systems aimed at preventing faults and avoiding unexpected failures.
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
Locking out a machine ensures the safety of the technician by preventing the accidental activation of the machinery while maintenance is being performed. This helps to avert potential accidents or injuries.
Step 3
What is clutch-pedal free play?
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Answer
Clutch-pedal free play refers to the amount of distance the clutch pedal travels before it engages with the linkage and the release bearing. Proper free play adjustment is vital for effective clutch operation.
Step 4
What is meant by the term viscosity index?
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The viscosity index is a measure of how much the viscosity of oil changes with fluctuations in temperature. A higher viscosity index indicates that the oil is less sensitive to temperature changes.
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 that compromise performance.
Weak or broken springs that can lead to improper function of the clutch assembly.
Step 6
Why does grease have a very high viscosity?
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Grease has a high viscosity to ensure that it can effectively coat and stick to bearing surfaces, providing proper lubrication and reducing wear and tear.
Step 7
What is cutting fluid?
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Answer
Cutting fluid is a mixture typically made of soluble oil and water, used to cool and lubricate the cutting tool during machining processes.
Step 8
Give a reason why the viscosity of a cutting fluid should be low.
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A cutting fluid should have a low viscosity to allow for easy flow, which enhances cooling and ensures effective dissipation of excess heat generated during machining.
