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GATE 2023 PI – Question 58

Manufacturing Processes II · Machining · 2 marks · Numerical answer

Straight turning uses feed rate 100 mm/min, spindle speed 1600 rpm and ASA tool signature 8–8–5–5–7–25–0. Find geometric peak-to-valley surface roughness in µm to two decimals.

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Correct answer: 7.10 to 7.40

Explanation

Feed per revolution is f = 100/1600 = 0.0625 mm. The ASA signature gives end cutting-edge angle 7°, side cutting-edge angle 25° and zero nose radius. The two straight cutting edges give $h=f/(\cot7^\circ+\tan25^\circ)=0.007258$ mm. Therefore **h ≈ 7.26 µm**.

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