Through hole of 12 mm diameter is to be drilled in a steel plate of 20 mm thickness, drilled spindle speed is 20 m/min, feed 0.25 mm/rev and drill point angle is 120°, the amount of material removed at the first 10 sec after full engagement of drill will be mm /sec. (a) 2300, (b) 2400, (c) 2500, (d) 2600, (e) 2700
Through hole of 12 mm diameter is to be drilled in a steel plate of 20 mm thickness, drilled spindle speed is 20 m/min, feed 0.25 mm/rev and drill point angle is 120°, the amount of material removed at the first 10 sec after full engagement of drill will be mm /sec. (a) 2300, (b) 2400, (c) 2500, (d) 2600, (e) 2700
Precision Machining Technology (MindTap Course List)
2nd Edition
ISBN:9781285444543
Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Chapter4: Drill Press
Section4.1: Introduction To The Drill Press
Problem 5RQ: Briefly describe a gang drill press and its benefit.
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