Project ForgeManufacturing Engineering
Machining Processes
GATE 2020
Medium
There are two identical shaping machines S1 and S2. In machine S2, the width of the workpiece is increased by 10% and the feed is decreased by 10%, relative to S1. If all other conditions remain the same, the ratio of total time per pass in S1 and S2 will be __________ (round off to one decimal place).
0.8(± 0.1 accepted)
Explanation
Time per pass in shaping is proportional to width/feed. T1∝W/f. T2∝(1.1W)/(0.9f)=1.2222×(W/f). Ratio T1/T2=1/1.2222≈0.818, rounding to 0.8.
Source: GATE ME 2020 Session 2 (ME-2) (2020)
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