Which ID operation is used to create a smooth finish on a workpiece interior?

Which ID operation is used to create a smooth finish on a workpiece interior?

• A. Reaming
• B. Boring
• C. Honing
• D. Drilling

Answer: (A)

Finishing an internal diameter to a smooth surface and precise size is achieved by reaming. After drilling or boring leaves the hole with minor imperfections, a reamer—thicker than the hole and guided along its axis—removes a small amount of material with light, controlled cuts. This tightens the diameter tolerance and significantly improves the interior surface finish compared with drilling or boring alone. Honing can produce an even finer finish but is used for specialized, ultra-precise bores; drilling and boring mainly establish size and straightness rather than the final surface quality. So, for a smooth interior finish in a typical machining sequence, reaming is the right choice.

Finishing an internal diameter to a smooth surface and precise size is achieved by reaming. After drilling or boring leaves the hole with minor imperfections, a reamer—thicker than the hole and guided along its axis—removes a small amount of material with light, controlled cuts. This tightens the diameter tolerance and significantly improves the interior surface finish compared with drilling or boring alone. Honing can produce an even finer finish but is used for specialized, ultra-precise bores; drilling and boring mainly establish size and straightness rather than the final surface quality. So, for a smooth interior finish in a typical machining sequence, reaming is the right choice.