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GATE 2024 PI – Question 18

Manufacturing Processes II · Machine Tools · 1 mark · Multiple choice

For simple indexing with a dividing head on a horizontal mill, select crank movement that creates 12 equal disc divisions.

  1. 3 turns + 5 holes on a 15-hole circle
  2. 5 turns + 4 holes on a 16-hole circle
  3. 3 turns + 5 holes on an 18-hole circle
  4. 5 turns + 4 holes on a 20-hole circle

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Correct answer: (A) 3 turns + 5 holes on a 15-hole circle

Explanation

Using the standard 40:1 dividing head, crank turns per division are $40/12=3+1/3$. One-third of a 15-hole circle is five hole spacings, giving **A**. The standard 40:1 head ratio is implicit in the question.

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