Home › Previous year questions › GATE 2025 PI › Question 50GATE 2025 PI – Question 50 Manufacturing Processes II · Machining · 2 marks · Numerical answer
Drill a 10 mm through-hole in 30 mm mild-steel plate at 600 rpm and feed 0.3 mm/rev. Approach and breakthrough distances are 3 mm each. Find drilling time (two decimal minutes).
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Show answer and explanation Correct answer: 0.19 to 0.21
Explanation Total axial travel is 30+3+3 = 36 mm. Axial feed speed is $600(0.3)=180$ mm/min. Thus $t=36/180=\mathbf{0.20}$ minute.
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