Manufacturing and Production Machine Operation and Maintenance 2 — Questions and Answers
Question 1: What is Total Productive Maintenance (TPM)?
- A reactive maintenance strategy focused only on fixing breakdowns
- A comprehensive maintenance approach involving all employees to maximize equipment effectiveness (Correct answer)
- A maintenance program exclusively for CNC machining centers
- A government-mandated equipment inspection and certification program
Correct answer: A comprehensive maintenance approach involving all employees to maximize equipment effectiveness
TPM is a company-wide maintenance philosophy that involves all employees—especially machine operators—in maintaining and continuously improving equipment effectiveness.
Question 2: Vibration analysis in predictive maintenance is primarily used to detect which type of problem?
- Chemical contamination in lubricants
- Electrical faults in control panels
- Mechanical imbalance, misalignment, and bearing wear (Correct answer)
- Temperature fluctuations in coolant systems
Correct answer: Mechanical imbalance, misalignment, and bearing wear
Vibration analysis detects mechanical issues such as imbalance, misalignment, and bearing wear in rotating machinery before catastrophic failure occurs.
Question 3: Which maintenance strategy typically results in the HIGHEST unplanned downtime costs?
- Predictive maintenance
- Preventive maintenance
- Total Productive Maintenance (TPM)
- Reactive (breakdown) maintenance (Correct answer)
Correct answer: Reactive (breakdown) maintenance
Reactive maintenance waits until equipment fails, resulting in unplanned downtime, emergency repair costs, potential secondary damage, and lost production.
Question 4: What is a maintenance work order primarily used for?
- Ordering spare parts directly from suppliers
- Documenting, authorizing, and tracking specific maintenance tasks (Correct answer)
- Approving changes to the production schedule
- Recording employee training and certification records
Correct answer: Documenting, authorizing, and tracking specific maintenance tasks
A maintenance work order documents, authorizes, and tracks specific maintenance tasks, including labor hours, parts used, and task completion status.
Question 5: What does MTTR stand for in maintenance performance metrics?
- Maximum Time to Repair
- Mean Time to Repair (Correct answer)
- Minimum Total Technical Response
- Machine Total Throughput Rate
Correct answer: Mean Time to Repair
MTTR (Mean Time to Repair) measures the average time required to diagnose, repair, and return a failed machine or component to operation.
Question 6: Which daily maintenance task is most critical for a CNC machining center?
- Replace all cutting tools at the start of each shift
- Recalibrate the entire coordinate reference system
- Clean chips and debris, and check lubricant and coolant levels (Correct answer)
- Reprogram all stored tool paths and offsets
Correct answer: Clean chips and debris, and check lubricant and coolant levels
Daily CNC maintenance includes cleaning chips from the work area and checking lubricant and coolant levels to prevent wear, corrosion, and contamination.
Question 7: In manufacturing maintenance, what does a Pareto analysis help identify?
- The optimal lubrication schedule for all machines
- The 20% of failure causes responsible for 80% of downtime (Correct answer)
- The total cost of spare parts inventory
- The sequence of preventive maintenance tasks
Correct answer: The 20% of failure causes responsible for 80% of downtime
Pareto analysis identifies the vital few causes (roughly 20%) that account for the majority (roughly 80%) of equipment failures or downtime, allowing teams to prioritize corrective actions.
Manufacturing and Production Machine Operation and Maintenance 2
What is Total Productive Maintenance (TPM)?