GATE ME 2014 Set 2 — Question 64
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Manufacturing Processes → Machining & Machine Tools → Conventional Machine Tools
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Question
A hole of diameter is to be drilled in a steel block of thickness. The drilling is performed at rotational speed of and feed rate of . The required approach and over run of the drill together is equal to the radius of drill. The drilling time (in minute) is
Correct answer
(B) 1.25
Solution
Given:
Diameter () =
Thickness () =
Rotational speed () =
Feed rate () =
Approach + Overrun () = Radius () = Total travel length () = Drilling time () =
Correct option is (B).
Diameter () =
Thickness () =
Rotational speed () =
Feed rate () =
Approach + Overrun () = Radius () = Total travel length () = Drilling time () =
Correct option is (B).
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