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9.1 State THREE types of maintenance procedures used on mechanical systems - NSC Mechanical Technology Fitting and Machining - Question 9 - 2019 - Paper 1
Question 9
9.1 State THREE types of maintenance procedures used on mechanical systems. 9.2 State TWO causes of the malfunctioning of belt drive systems. 9.3 Briefly explain t... show full transcript
Worked Solution & Example Answer:9.1 State THREE types of maintenance procedures used on mechanical systems - NSC Mechanical Technology Fitting and Machining - Question 9 - 2019 - Paper 1
Step 1
State THREE types of maintenance procedures used on mechanical systems.
Answer
- Preventative Maintenance: This involves regular maintenance activities to prevent equipment failures and extend the lifespan of machinery.
- Predictive Maintenance: This type relies on data analysis to predict when maintenance should be performed based on the actual condition of the equipment.
- Reliable Centred Maintenance: A systematic approach focused on maximizing the reliability of equipment while minimizing costs.
Step 2
State TWO causes of the malfunctioning of belt drive systems.
Answer
- Incorrect pulley alignment: If the pulleys are not aligned properly, it can lead to belt slippage and eventual malfunction.
- Overloading the system: Excessive load on the belt drive can cause premature wear and eventual failure.
Step 3
Briefly explain the procedure to replace the chain on a chain drive system.
Answer
- Release the tension on the chain: This can be done by loosening the bolts on the tensioner or removing the cover plate.
- Remove from the sprocket: Carefully take off the chain from the sprocket without damaging the components.
- Check sprocket condition: Inspect the sprockets for wear or damage and replace if necessary.
- Fit the new chain: Install the new chain onto the sprockets and ensure proper alignment.
- Apply proper tension: Adjust the chain tension according to the manufacturer’s specifications.
- Check for proper operation: Finally, run the system briefly to ensure everything functions correctly.
Step 4
State TWO procedures to reduce the wear on a gear drive system.
Answer
- Check and replenish lubrication levels: Regularly ensure the lubricant is at the proper levels to reduce friction and wear.
- Inspect for excessive noise or vibration: Address any unusual sounds immediately to prevent further wear or damage.
Step 5
Step 6
Classify the following material as thermoplastic composites or thermo-hardened (thermo-setting) composites:
Answer
9.6.1 Teflon: Classified as a thermoplastic composite since it can be remolded. 9.6.2 Bakelite: Classified as a thermo-hardened (thermo-setting) composite, as it cannot be remolded once set.
Step 7
Name any TWO factors that influence the coefficient of friction between two surfaces.
Answer
- Surface Roughness: The texture of the surfaces in contact affects how they grip each other.
- Type of Material: Different materials have distinct coefficients of friction depending on their intrinsic properties.