Define preventative maintenance - NSC Mechanical Technology Welding and Metalwork - Question 8 - 2017 - Paper 1
Question 8
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 Welding and Metalwork - Question 8 - 2017 - Paper 1
Step 1
Define preventative maintenance.
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Answer
Preventative maintenance can be described as maintenance of equipment or systems before a fault occurs. This involves routine checking and servicing to prevent 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 that its start switch cannot be activated without the technician's knowledge, preventing accidental start-up during maintenance which could lead to injuries.
Step 3
What is clutch-pedal free play?
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Answer
Clutch-pedal free play refers to the distance the pedal moves before the slack is taken from the linkage and the release bearing engages. This is crucial for proper 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 oil's viscosity changes as temperature varies. A higher viscosity index indicates that the oil's viscosity changes less with temperature.
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 ineffective clutch engagement.
Weak or broken springs may fail to apply the necessary pressure for proper operation.
Step 6
Why does grease have a very high viscosity?
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Grease has a high viscosity to ensure that it adheres to and lubricates bearing surfaces effectively, reducing wear and efficient lubrication.
Step 7
What is cutting fluid?
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Answer
Cutting fluid is a lubricant applied in machining processes, typically a mixture of soluble oil and water, used to cool and lubricate the cutting surface.
Step 8
Give a reason why the viscosity of a cutting fluid should be low.
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Answer
A cutting fluid should have a low viscosity to allow easy flow and efficient dissipation of excess heat during machining, improving tool performance and longevity.
