A through hole is drilled in an aluminium 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).

A through hole is drilled in an aluminium alloy plate of 15 mm thickne

1.	A through hole is drilled in an aluminium 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).
A.	274.89
B.	374.89
C.	274.99
D.	274
Answer» B. 374.89

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