Which machine is used to polish soft metals including copper and brass as well as plastics?

Which machine is used to polish soft metals including copper and brass as well as plastics?

• A. Polishing or buffing machine
• B. Metal polish
• C. Emery cloth
• D. Twist drill bit

Answer: (A)

Polishing and buffing rely on a rotating soft wheel and polishing compounds to refine the surface, removing micro-scratches and producing a smooth, shiny finish. This method is ideal for soft materials like copper, brass, and many plastics, where gentle abrasive action can bring out a high gloss without removing too much material or causing heat damage. A polishing or buffing machine provides the right setup—soft wheels, appropriate speeds, and compounds—to achieve that refined look on these materials. Metal polish is a polishing compound, not a machine, so it won’t perform the finishing action by itself. Emery cloth is an abrasive material used for shaping or roughing, not for final polishing. A twist drill bit is used for drilling, not finishing.

Polishing and buffing rely on a rotating soft wheel and polishing compounds to refine the surface, removing micro-scratches and producing a smooth, shiny finish. This method is ideal for soft materials like copper, brass, and many plastics, where gentle abrasive action can bring out a high gloss without removing too much material or causing heat damage. A polishing or buffing machine provides the right setup—soft wheels, appropriate speeds, and compounds—to achieve that refined look on these materials.

Metal polish is a polishing compound, not a machine, so it won’t perform the finishing action by itself. Emery cloth is an abrasive material used for shaping or roughing, not for final polishing. A twist drill bit is used for drilling, not finishing.