GATE ME 2020 Set 2 — Question 54
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Manufacturing Processes → Machining & Machine Tools → Conventional Machine Tools
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Question
There are two identical shaping machines and . In machine , the width of the workpiece is increased by and the feed is decreased by , with respect to that of . If all other conditions remain the same then the ratio of total time per pass in and will be ________ (round off to one decimal place).
Correct answer
0.7 to 0.9
Solution
The total time for a shaping operation per pass is given by:
where is the width of the workpiece, is the quick return ratio, is the feed, and is the number of strokes per minute.Since all other conditions are identical, .For machine :
For machine : and
The ratio of total time per pass in and is:
.
where is the width of the workpiece, is the quick return ratio, is the feed, and is the number of strokes per minute.Since all other conditions are identical, .For machine :
For machine : and
The ratio of total time per pass in and is:
.
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