Which of the following is basically a polishing operation ?

Explanation:

​Buffing:

• Buffing is similar to polishing, with the exception that very fine abrasive is used on soft disks made of cloth or hide.
• The abrasive is supplied externally from the stick of the abrasive compound. Polished parts may subsequently be buffed to obtain an even fiber surface finish.

Additional Information

Lapping

• It is used to produce finished surfaces. It gives a very high degree of accuracy and smoothness.
• It is used in the production of optical lenses, metallic bearing surfaces, measuring gauges, surface plates, and other measuring instruments.
• Machine lapping is recognized as a fast lapping process.
• In machine lapping, pressure up to 0.02 N/mm2 for soft material and 0.5 N/mm2 for hard material is applied.

Honing 

• It is a finishing process, in which a tool called hone carries out a combined rotary and reciprocating motion while the workpiece does not perform any working motion. The surface finish of the cylindrical hole is maintained by honing.