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I n a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plate of 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is 118°. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) is
  • a)
    35.1
  • b)
    32.4
  • c)
    31.2
  • d)
    30.1
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
I n a single pass drilling operation, a through hole of 15 mm diameter...
°. Calculate the cutting speed and the drilling time for this operation.

To calculate the cutting speed, we can use the formula:

Cutting Speed (m/min) = π * Drill Diameter (mm) * Spindle Speed (rpm) / 1000

Cutting Speed = π * 15 * 500 / 1000 = 23.56 m/min

Next, we can calculate the drilling time using the formula:

Drilling Time (min) = Drilling Depth (mm) / Feed Rate (mm/rev) / Spindle Speed (rpm)

Drilling Depth = 50 mm

Drilling Time = 50 / 0.2 / 500 = 0.5 min

Therefore, the cutting speed for this operation is 23.56 m/min and the drilling time is 0.5 minutes.
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Community Answer
I n a single pass drilling operation, a through hole of 15 mm diameter...
Total travel = 50 + 2 + 2 + 7.5/tan(59) = 58.5 mm.
time = 60*L/Nf = 35.1 
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I n a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plateof 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is118°. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) isa)35.1b)32.4c)31.2d)30.1Correct answer is option 'A'. Can you explain this answer?
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I n a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plateof 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is118°. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) isa)35.1b)32.4c)31.2d)30.1Correct answer is option 'A'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about I n a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plateof 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is118°. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) isa)35.1b)32.4c)31.2d)30.1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for I n a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plateof 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is118°. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) isa)35.1b)32.4c)31.2d)30.1Correct answer is option 'A'. Can you explain this answer?.
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