BITS Pilani Mechanical Engineering Workshop Practice Lecture 9

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Questions and Answers

What is the primary difference between orthogonal and oblique cutting?

  • Workpiece material
  • Motion of workpiece
  • Type of tool material
  • Cutting edge angle (correct)

What percentage of heat is distributed to the workpiece during machining?

  • 20%
  • 10% (correct)
  • 30%
  • 80%

Which of the following factors does not influence tool life?

  • Machine tool geometry (correct)
  • Cutting conditions
  • Workpiece material
  • Tool material

What is the primary function of the chip in metal cutting?

<p>To remove the material from the workpiece (A)</p>
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What type of tool has a single cutting edge?

<p>Single Point tool (A)</p>
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What is the relationship between cutting speed and tool life according to Taylor's expression?

<p>Inversely proportional (B)</p>
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What is the effect of reducing the cutting speed by 50% on the tool life, given n = 0.5 and C = 400?

<p>Tool life increases by 300% (B)</p>
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What is the value of n in the modified Taylor's equation, given that θ1 > θ2 > θ3?

<p>n cannot be determined from the given information (A)</p>
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If the useful tool life of a HSS tool machining mild steel at 18 m/min is 3 hours, what is the tool life when the tool operates at 24 m/min, assuming n = 0.125?

<p>1.5 hours (D)</p>
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What is the unit of the constant C in Taylor's expression?

<p>Dimensionless (B)</p>
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Flashcards

Orthogonal vs. Oblique Cutting

The cutting edge angle distinguishes orthogonal cutting from oblique cutting.

Heat Distribution to Workpiece

Only a small fraction (around 10%) of generated heat goes into the workpiece.

Factors Influencing Tool Life

The geometry of the machine tool itself doesn't directly wear down the cutting tool.

Primary Function of Chip

The chip's main job is to carry away the material removed from the workpiece efficiently.

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Single Point Tool

A single point tool has… you guessed it… only one cutting edge doing the work.

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Cutting Speed & Tool Life

As cutting speed increases, tool life decreases (and vice versa), according to Taylor's equation.

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Tool Life Increase

Tool life increases by 300% when cutting speed is halved.

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Tool Life When Speed Increases

Tool life is halved (reduced by 50%)

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Unit of Constant C

C is a constant representing the cutting speed for a 1-minute tool life, and it is Dimensionless

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