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Question

In a shaping process, the number of double strokes per minute is 30 and the quick return ratio is 0.6. If the length of the stroke is 250mm the average cutting velocity in mm/min.

A
3.0
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B
4.5
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C
7.5
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D
12.0
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Solution

The correct option is D 12.0
Double strokes per min =30
Quick return ratio: M=0.6
Stroke length: L=250mm
Average cutting velocity
=L.N(1+M)
=30×250(1+0.6)=12.0m/min

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