Engineering, 18.03.2020 19:03 hjoe523

A gun drilling operation is used to drill a 9/64-in diameter hole to a certain depth. It takes 4.5 minutes to perform the drilling operation using high-pressure fluid delivery of coolant to the drill point. The current spindle speed = 4000 rev/min, and feed = 0.0017 in/rev. In order to improve the surface finish in the hole, it has been decided to increase the speed by 20% and decrease the feed by 25%.
How long will it take to perform the operation at the new cutting conditions?

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A gun drilling operation is used to drill a 9/64-in diameter hole to a certain depth. It takes 4.5 m...