blocker and polisher Interview Questions and Answers

1. What is the primary function of a blocker in the finishing process?

   • Answer: The primary function of a blocker is to remove major imperfections and level the surface of a workpiece, preparing it for subsequent polishing steps. This includes removing scratches, tool marks, and other significant surface irregularities.

2. What is the primary function of a polisher in the finishing process?

   • Answer: The primary function of a polisher is to achieve a high-gloss, mirror-like finish by removing fine scratches and imperfections left by the blocking stage. It refines the surface to a very smooth and reflective state.

3. What are the different types of blockers available?

   • Answer: Blockers can be manual (e.g., using sanding blocks), pneumatic (using air-powered tools), or robotic (using automated systems). They also vary in the type of abrasive used (e.g., sandpaper, abrasive compounds).

4. What are the different types of polishers available?

   • Answer: Polishers also come in manual, pneumatic, and robotic variations. They utilize different types of polishing compounds and pads, ranging from rough to fine abrasives, to achieve different levels of shine.

5. Describe the process of selecting the appropriate grit of sandpaper for blocking.

   • Answer: Grit selection depends on the severity of the imperfections. Start with a coarser grit (lower number, e.g., 80-120) to remove major flaws and progressively move to finer grits (higher number, e.g., 220-400) to refine the surface before polishing.

6. How do you determine when the blocking stage is complete?

   • Answer: Blocking is complete when the major imperfections are removed, and a relatively even surface is achieved. The surface should be free of significant scratches or tool marks, ready for the polishing stage. Visual inspection and tactile assessment are key.

7. What types of polishing compounds are commonly used?

   • Answer: Common polishing compounds include diamond compounds, rouge, white polishing compound, and various proprietary blends. The choice depends on the material being polished and the desired finish.

8. Explain the importance of proper pressure application during blocking and polishing.

   • Answer: Too much pressure can lead to uneven removal of material, creating new imperfections or damage. Too little pressure results in slow progress and inefficient work. Consistent, moderate pressure is crucial for achieving even results.

9. Describe the importance of lubrication during blocking and polishing.

   • Answer: Lubrication reduces friction, prevents overheating, and promotes a more even finish. Lubricants can be water, oil-based solutions, or specialized polishing fluids depending on the material and process.

10. How do you prevent burn-through during polishing?

    • Answer: Burn-through occurs when too much material is removed in one area. This is prevented by using appropriate pressure, lubrication, and progressively finer abrasives. Regular inspection of the workpiece is also essential.

11. What safety precautions should be taken while using power tools for blocking and polishing?

    • Answer: Always wear appropriate safety glasses, hearing protection, and a dust mask. Secure the workpiece firmly to prevent movement. Follow manufacturer's instructions for the specific tool being used.

12. How do you clean and maintain your blocking and polishing tools?

    • Answer: Clean tools after each use to remove abrasive residue. Store tools properly to prevent damage. Replace worn-out or damaged pads and abrasives as needed.

13. What is the difference between a random orbital polisher and a rotary polisher?

    • Answer: A random orbital polisher uses a rotating and orbiting motion, reducing the risk of swirl marks. A rotary polisher uses a simple spinning motion and is more aggressive, but also more prone to creating swirl marks if not used properly.

14. Explain the concept of "cutting" and "finishing" in polishing.

    • Answer: "Cutting" refers to the aggressive removal of material using coarser compounds, while "finishing" uses finer compounds to refine the surface and achieve a high gloss.

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