Project ForgeManufacturing Engineering
Machining Processes
GATE 2016
Medium
In a turning operation, the length of job is 900 mm, diameter of job is 200 mm, feed rate is 0.25 mm/rev, and optimum cutting speed is 300 m/min. The machining time (in min) is __________.
7.5 min(± 0.15 accepted)
Explanation
Spindle speed N = 1000V/(πD) = 1000×300/(π×200) ≈ 477.5 rpm. Machining time = L/(f·N) = 900/(0.25×477.5) ≈ 7.54 min.
Source: GATE ME 2016 Set-2 (2016)
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