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 a proactive approach to maintain equipment or a system before a fault occurs. This involves regular inspections and servicing to prevent potential breakdowns.
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 ensure that the machine is switched off and locked out to prevent accidental activation. This protects maintenance personnel from hazardous situations, as the machine cannot be started without the technician's knowledge.
Step 3
What is clutch-pedal free play?
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Clutch-pedal free play refers to the distance that the clutch pedal moves before it engages the clutch mechanism. This is crucial for ensuring proper disengagement and engagement of the clutch.
Step 4
What is meant by the term viscosity index?
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The viscosity index measures how much the viscosity of oil changes with temperature variations. A higher viscosity index indicates that the oil remains more stable in its viscosity despite changes in 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, which can lead to slipping and reduced performance.
Weak or broken springs, causing ineffective engagement or disengagement of the clutch.
Step 6
Why does grease have a very high viscosity?
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Grease has a very high viscosity to ensure that it adheres firmly to moving parts. This property allows it to coat the surfaces effectively and maintain lubrication under pressure.
Step 7
What is cutting fluid?
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Cutting fluid is a liquid used to lubricate and cool the cutting area in machining processes. It typically consists of a mixture of soluble oil and water.
Step 8
Give a reason why the viscosity of a cutting fluid should be low.
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A cutting fluid should have low viscosity to allow easy flow and effective dissipation of excess heat generated during the cutting process. This helps in preventing overheating and ensures efficient cutting.
