Which machine would you use to produce a bright finish on soft metals and plastics by polishing?

• A. Polishing or buffing machine
• B. Angle grinder
• C. Hacksaw
• D. Piercing saw

Answer: (A)

To get a bright, mirror-like finish on soft metals and plastics you need a finishing process that uses fine abrasives and a gentle, controlled action. A polishing or buffing machine does exactly that: it spins a soft cloth or felt wheel with a polishing compound to smooth tiny scratches and bring out a high shine, while keeping heat under control to avoid damaging delicate plastics. This makes it the best choice for achieving a bright surface. An angle grinder is intended for cutting or heavy grinding and can scratch, overheat, or mar the finish. The hacksaw and piercing saw are cutting tools with no polishing function, so they won’t produce the desired bright finish.