Draw a chain-drive system. Include an idler sprocket and show the tight and slack sides of the chain.

Here are the solutions to the next set of questions:

1.3.3 Current flow
An ammeter is used to measure current flow.

1.4 Draw a chain-drive system. Include an idler sprocket and show the tight and slack sides of the chain.
Since I cannot draw, I will describe the components and their arrangement:
A chain-drive system consists of a driver sprocket (connected to the input shaft), a driven sprocket (connected to the output shaft), and an endless chain connecting them. An idler sprocket is typically placed on the slack side of the chain to maintain tension and guide the chain.

• The tight side of the chain is the section under tension, pulling the driven sprocket. This is usually the upper run when the driver sprocket rotates clockwise and the driven sprocket is to its right.
• The slack side of the chain is the section with less tension, returning to the driver sprocket. This is usually the lower run in the same configuration. The idler sprocket would press against this side.

QUESTION 2

2.1 Explain backlash between TWO gears.
Backlash is the clearance or play between the teeth of two meshing gears. It is the amount by which a tooth space exceeds the thickness of the engaging tooth, allowing for smooth operation without binding.

2.2 Name the tool that is used to check the backlash between gears.
A dial indicator is commonly used to check backlash between gears.

2.3 List TWO symptoms of each of the following gear drives:

2.3.1 Too much backlash.

1. Excessive noise and vibration during operation.
2. Inaccurate positioning or indexing of the driven component.

2.3.2 Too little backlash.

1. Gears bind or jam, leading to increased friction and heat.
2. Accelerated wear on gear teeth surfaces due to constant contact and pressure.

2.4 List FIVE implications of non-conformance with the manufacturer's specifications when setting equipment with simple control systems.

1. Reduced efficiency and performance of the equipment.
2. Increased wear and tear on components, leading to premature failure.
3. Potential safety hazards for operators and surrounding equipment.
4. Inaccurate or inconsistent output from the control system.
5. Higher maintenance costs and increased downtime.

2.5 List the steps to follow when returning a machine back to operation after maintenance is completed.

1. Perform a thorough visual inspection to ensure all tools, parts, and debris are removed.
2. Lubricate all necessary components according to manufacturer specifications.
3. Conduct functional tests to verify all systems are operating correctly.
4. Calibrate sensors and actuators to ensure accurate readings and responses.
5. Perform a safety check to confirm all guards and safety devices are in place and functional.

2.6 Explain FOUR functions of a control system.

1. Measurement: The system gathers data from sensors about the process variables (e.g., temperature, pressure, speed).
2. Comparison: The measured values are compared to a desired setpoint or reference value.
3. Correction: Based on the comparison, the control system determines the necessary action to bring the process variable closer to the setpoint.
4. Actuation: The system sends signals to actuators (e.g., motors, valves) to implement the corrective action and influence the process.

QUESTION 3

3.1 Name FOUR types of non-friction bearings.

1. Ball bearings
2. Roller bearings
3. Needle bearings
4. Tapered roller bearings

3.2 List THREE methods to check for faults on a bearing.

1. Visual inspection for signs of wear, discoloration, or damage.
2. Noise analysis (listening for unusual sounds like grinding, squealing, or clicking).
3. Temperature monitoring (checking for excessive heat generation).

3.3 State ONE cause of each of the following signs of belt failure in a belt-drive system:

3.3.1 Cracks
Ageing of the belt material or exposure to ozone or excessive heat.

3.3.2 Abrasion
Misalignment of pulleys or contact with foreign objects.

3.3.3 Excessive stretch
Overloading the belt beyond its design capacity or incorrect tensioning.

3.3.4 Loss in speed
Belt slippage due to insufficient tension, oil contamination, or worn pulleys.