Home › Previous year questions › GATE 2021 PI › Question 57GATE 2021 PI – Question 57 Manufacturing Processes II · Machine Tools · 2 marks · Numerical answer
A shaper removes the top layer of a 750 × 300 mm plate in one depth of cut, with 750 mm along tool travel. Approach and overtravel are 25 mm each; average cutting speed 10 m/min; feed 0.4 mm/stroke; return/cutting time ratio 1:2. Find machining time in min to one decimal.
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Show answer and explanation Correct answer: 89.0 to 91.0
Explanation Cutting travel = 750+25+25 = 800 mm = 0.8 m. Cutting time = 0.8/10 = 0.08 min/stroke; return time = 0.04 min. Required cycles = width/feed = 300/0.4 = 750. Total = 750×0.12 = **90.0 min**.
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