GATE ME 2019 Set 1 — Question 25
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Manufacturing Processes → Machining & Machine Tools → Conventional Machine Tools
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Question
The length, width and thickness of a steel sample are , and , respectively. Its thickness needs to be uniformly reduced by in a single pass by using horizontal slab milling. The milling cutter (diameter: , width: ) has teeth and rotates at . The feed per tooth is . The feed direction is along the length of the sample. If the over-travel distance is the same as the approach distance, the approach distance and time taken to complete the required machining task are
Correct answer
(D) 14 mm, 21.4 s
Solution
Given:
Length of workpiece () =
Depth of cut () =
Cutter diameter () =
Number of teeth () =
Rotational speed () =
Feed per tooth () =
.
Converting to seconds: .Thus, the approach distance is and the time taken is .
Length of workpiece () =
Depth of cut () =
Cutter diameter () =
Number of teeth () =
Rotational speed () =
Feed per tooth () =
1.Approach distance ():
For slab milling, .2.Total length of travel ():
Over-travel () = Approach distance () = ..
3.Table feed rate ():
.4.Machining time ():
.Converting to seconds: .Thus, the approach distance is and the time taken is .
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