The GATE Grind

GATE 2021 ME (ME1) – Question 18

Machining and Machine Tool Operations · Machining operations, machine tools, cutting tools and tool geometry · 1 mark · Multiple choice

The correct sequence of machining operations to be performed to finish a large diameter through hole is

  1. Drilling, boring, reaming
  2. Boring, drilling, reaming
  3. Drilling, reaming, boring
  4. Boring, reaming, drilling

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Show answer and explanation

Correct answer: (A) Drilling, boring, reaming

Explanation

Drilling first creates the initial hole. Boring enlarges and corrects its location and geometry. Reaming removes a small finishing allowance for size and surface finish.

Therefore the correct sequence is **drilling → boring → reaming (A)**. Finishing before enlargement would destroy the finished surface.