Define preventative maintenance - NSC Mechanical Technology Fitting and Machining - 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 Fitting and Machining - 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 before a fault occurs. This type of maintenance helps in avoiding unexpected breakdowns and ensures the consistent operation 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 because it prevents the accidental activation of the machine during maintenance. This ensures the safety of the technician and minimizes the risk of workplace accidents.
Step 3
What is clutch-pedal free play?
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Clutch-pedal free play refers to the distance the pedal moves before the slack is taken from the linkage and the release bearing. This adjustment is important for ensuring proper clutch operation.
Step 4
What is meant by the term viscosity index?
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The viscosity index measures how much the viscosity of an oil changes with temperature fluctuations. A higher viscosity index indicates that the oil retains its viscosity better over 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 reduce clutch effectiveness, leading to slippage.
Weak or broken springs can affect the clutch's engagement and disengagement, necessitating replacement.
Step 6
Why does grease have a very high viscosity?
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Grease has a very high viscosity to ensure that it remains solid at ambient temperatures and forms a lubricant film over bearing surfaces, providing effective lubrication.
Step 7
What is cutting fluid?
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Cutting fluid is a mixture of soluble oil and water, used in machining processes to cool and lubricate the cutting tool and workpiece.
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 it to easily flow and effectively dissipate excess heat generated during cutting operations.
