Blind hole 20 mm diameter, 60 mm deep are being drilled in steel stock, drilling spindle speed is 500 rpm, feed 0.3 mm/rev, point angle of drill is 1180. Machining time ( in minutes ) per hole will be (a) 0.40, (b) 0.42, (c) 0.44, (d) 0.46, (e) 0.48

Blind hole 20 mm diameter, 60 mm deep are being drilled in steel stock, drilling spindle speed is 500 rpm, feed 0.3 mm/rev, point angle of drill is 1180. Machining time ( in minutes ) per hole will be (a) 0.40, (b) 0.42, (c) 0.44, (d) 0.46, (e) 0.48

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 3RQ: Explain how the size of an upright drill press is determined.

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Concept explainers

Machining Processes and Machine Tools

Machining is represented as the process in which an excessive amount of substance is eliminated from the particular element in the form of pieces. In machining, cutting tools such as rotary tools, lathe, drill press, grinder, chop saw, welders, and many more are applied to get the desired shape. As compared to other manufacturing processes, machining is precise and versatile.

Question

5. Blind hole 20 mm diameter, 60 mm deep are being drilled in steel stock, drilling spindle speed is
500 rpm, feed 0.3 mm/rev, point angle of drill is 1180. Machining time ( in minutes ) per hole will
be ..
(a) 0.40, (b) 0.42, (c) 0.44, (d) 0.46, (e) 0.48

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