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 a system before a fault occurs. This proactive approach helps to avoid unexpected breakdowns and extends the lifespan of the 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 essential to switch off and lock out the machine to prevent accidental activation of the machine's start switch while maintenance is being performed. This ensures the safety of the technician, avoiding the risk of accidents that could occur if the machine inadvertently starts while it is being serviced.
Step 3
What is clutch-pedal free play?
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Clutch-pedal free play refers to the distance the clutch pedal can move before it engages with the linkage and release bearing. This play is necessary to ensure smooth operation and to prevent unnecessary wear on the clutch components.
Step 4
What is meant by the term viscosity index?
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The viscosity index is a measure of how significantly the viscosity of an oil changes with temperature variations. A higher viscosity index indicates that the oil maintains a more consistent viscosity across a wider temperature range.
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 engagement and performance, leading to difficulty in shifting gears.
Glazed friction linings due to overheating can result in slippage, affecting the vehicle's power transfer.
Step 6
Why does grease have a very high viscosity?
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Grease has a high viscosity to ensure that it effectively coats and sticks to the bearing surfaces, providing adequate lubrication and protection against wear and tear.
Step 7
What is cutting fluid?
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Answer
Cutting fluid is a liquid used to lubricate and cool the tool and workpiece during machining processes. It typically consists of a mixture of soluble oil and water to enhance cooling and lubrication.
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, ensuring effective heat dissipation from the machining area, which helps to prevent overheating and damage to both the tool and workpiece.
