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9.1 Preventative maintenance of mechanical drive systems is divided into two subgroups - NSC Mechanical Technology Fitting and Machining - Question 9 - 2021 - Paper 1
Question 9
9.1 Preventative maintenance of mechanical drive systems is divided into two subgroups. Name the TWO subgroups. 9.2 State THREE preventative maintenance procedures ... show full transcript
Worked Solution & Example Answer:9.1 Preventative maintenance of mechanical drive systems is divided into two subgroups - NSC Mechanical Technology Fitting and Machining - Question 9 - 2021 - Paper 1
Step 1
Preventative maintenance of mechanical drive systems is divided into two subgroups. Name the TWO subgroups.
Answer
The two subgroups of preventative maintenance in mechanical drive systems are:
- Planned or scheduled maintenance: This involves routine check-ups and maintenance actions scheduled at specific intervals.
- Condition-based maintenance: This approach focuses on performing maintenance when certain conditions indicate that it is necessary, thus preventing unexpected failures.
Step 2
State THREE preventative maintenance procedures to ensure that a gear drive performs well.
Answer
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Checking and replenishment of lubrication levels: Regularly monitoring and adding lubricant to ensure smooth operation of the gear drive.
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Ensuring that gears are properly secured to shafts: This involves tightening and inspecting gear connections to prevent slippage or misalignment.
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Reporting excessive noise, wear, vibration, and overheating for expert attention: Observing and noting any unusual signs in the gear drive mechanism and consulting with experts when necessary.
Step 3
Step 4
State TWO properties of EACH of the following materials:
Answer
9.4.1 Teflon
- Water resistant: This material does not absorb moisture which makes it ideal for various applications.
- Resistant to heat: Teflon can withstand high temperatures without degrading.
9.4.2 Nylon
- Tough: Nylon is known for its durability and strength, making it suitable for tough applications.
- Lightweight: This material offers a good strength-to-weight ratio, making it easy to handle and install.
9.4.3 Vesconite
- Low friction: Vesconite exhibits excellent low friction properties, making it suitable for bearings.
- Wear-resistant: This material is highly resistant to wear and has a long lifespan under normal operating conditions.
Step 5
Step 6
Explain the difference between thermoplastic and thermo-hardened composites.
Answer
Thermoplastic composites can be re-heated and reshaped, allowing for recycling and modification after initial molding. They become pliable upon heating, which makes them easier to work with in forming processes.
Thermo-hardened composites, on the other hand, cannot be re-heated to reshape them once they have been molded and cured. They undergo a chemical change during the heating process that solidifies their structure, making them more rigid and durable but less flexible for future modifications.