Project ForgeManufacturing Engineering
Machining Processes
GATE 2019
Hard
A through hole is drilled in an aluminum alloy plate of 15 mm thickness with a drill bit of diameter 10 mm, at a feed of 0.25 mm/rev and a spindle speed of 1200 rpm. If the specific energy required for cutting this material is 0.7 N·m/mm³, the power required for drilling is ___ W (round off to two decimal places).
274.9 W(± 3 accepted)
Explanation
MRR=(π/4)D²×f×N=(π/4)(10)²×0.25×1200≈23562 mm³/min≈392.7 mm³/s. Power=specific energy×MRR=0.7×392.7≈274.9 W.
Source: GATE ME 2019 Session 2 (Set 3) (2019)
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