CPT Equipment Operation & Maintenance 2 — Questions and Answers
Question 1: What is the primary purpose of a bench grinder's tool rest in a prosthetic lab?
- To support the workpiece at a consistent angle for safe grinding (Correct answer)
- To catch metal shavings during operation
- To adjust the grinder speed automatically
- To prevent sparks from reaching flammable materials
Correct answer: To support the workpiece at a consistent angle for safe grinding
The tool rest supports the workpiece at a safe, consistent angle to prevent it from being caught by the wheel.
Question 2: When operating a drill press for prosthetic component fabrication, which action should be taken before changing drill bits?
- Reduce the speed to minimum
- Lock the chuck with a chuck key and power off the machine (Correct answer)
- Apply lubricant to the new bit
- Increase the table height to maximum
Correct answer: Lock the chuck with a chuck key and power off the machine
The machine must be powered off and the chuck locked before bit changes to prevent accidental startup and injury.
Question 3: Which maintenance task should be performed on a vacuum-forming machine's heating element at regular intervals?
- Lubricate with machine oil
- Inspect for oxidation and clean with a dry cloth (Correct answer)
- Replace with a new element monthly
- Coat with silicone spray to prevent sticking
Correct answer: Inspect for oxidation and clean with a dry cloth
Heating elements should be inspected for oxidation and cleaned with a dry cloth to maintain even heat distribution.
Question 4: A band saw blade in a prosthetic lab breaks during use. What is the first corrective step?
- Replace the blade immediately while the machine winds down
- Power off the machine and wait for all motion to stop before opening guards (Correct answer)
- Reverse the blade direction to relieve tension
- Increase blade tension to prevent further breakage
Correct answer: Power off the machine and wait for all motion to stop before opening guards
Always power off and wait for complete stop before opening any guards or accessing a broken blade.
Question 5: In a prosthetic fabrication lab, what is the recommended frequency for inspecting abrasive grinding wheels for cracks?
- Monthly
- Annually
- Before each use (Correct answer)
- After every 10 hours of operation
Correct answer: Before each use
Grinding wheels should be visually inspected and ring-tested before each use to detect cracks that could cause catastrophic failure.
Question 6: What type of personal protective equipment is mandatory when operating a lathe for prosthetic socket fabrication?
- Hearing protection and leather gloves
- Safety glasses and no loose clothing or gloves (Correct answer)
- Face shield and cut-resistant gloves
- Dust mask and chemical-resistant apron
Correct answer: Safety glasses and no loose clothing or gloves
Safety glasses are required, but gloves are prohibited on a lathe because they can catch rotating parts and pull the hand in.
Question 7: When storing lamination resins and solvents in the prosthetic lab, which condition is most important to maintain?
- High humidity to prevent static buildup
- Cool temperature away from ignition sources (Correct answer)
- Direct sunlight for temperature stability
- Proximity to ventilation fans for quick evaporation
Correct answer: Cool temperature away from ignition sources
Flammable resins and solvents must be stored cool and away from ignition sources to prevent fire or explosion.
CPT Equipment Operation & Maintenance 2
What is the primary purpose of a bench grinder's tool rest in a prosthetic lab?