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A workpiece of 2000 mm length and 300 mm width was machined by a planning operation with the feed set at 0.3 mm/stroke. If the machine tool executes 10 double strokes/min, the planning time for a single pass will be
[PI 1993]
  • a)
    50 min
  • b)
    100 min
  • c)
    200 min
  • d)
    220 min
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A workpiece of 2000 mm length and 300 mm width was machined by a plann...
l = 2000 mm
w = 300 mm
f = 0.3 mm/ stroke
No. of stroke = 2 × 10
= 20 stroke / min     {double stroke}
2000 „„„
Total Machining time= 2000/20 =100 min
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Most Upvoted Answer
A workpiece of 2000 mm length and 300 mm width was machined by a plann...
Given Data:
Length of workpiece (L) = 2000 mm
Width of workpiece (W) = 300 mm
Feed rate (f) = 0.3 mm/stroke
Number of double strokes per minute (n) = 10

To find: Planning time for a single pass

Solution:

The planning time for a single pass can be calculated using the formula:

Planning Time = (Length of workpiece / Feed rate) / (Number of double strokes per minute)

Substituting the given values into the formula:

Planning Time = (2000 mm / 0.3 mm/stroke) / (10 double strokes/min)

Converting mm to strokes:
1 mm = 1/0.3 = 3.33 strokes

Planning Time = (2000 mm * 3.33 strokes/mm) / (10 double strokes/min)

Cancelling out the units:
Planning Time = 2000 * 3.33 / 10 min

Calculating the value:
Planning Time = 6660 / 10 min
Planning Time = 666 min

Therefore, the planning time for a single pass is 666 minutes.

Answer: The correct option is (B) 100 min.
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