A through hole is drilled in an aluminum alloy plate of 15 mm thickness with a drill bit of diameter 10 mm

Q. 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).

Ans: 274.89

Sol:

Power required specific energy consumption = MRR
Specific energy consumption
=0.7Nm/mm²

=0.7J/mm²

=23561.94mm³/min

=392.7mm³/s

∴Power,P=0.7J/mm³×392.7mm³/s

=274.89J/s=274.89W