The drilling time (in minute) is
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:A hole of 20 mm diameter is to be drilled in a steel block of 40 mm thickness. The drilling is
performed at rotational speed of 400 rpm and feed rate of 0.1 mm/rev. The required approach
and over run of the drill together is equal to the radius of drill. The drilling time (in minute) is
(A) 1.00
(B) 1.25
(C) 1.50
(D) 1.75
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