Finishing Cut in Machining
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Questions and Answers

What tends to increase the shear angle according to the Merchant equation?

  • Larger rake angle (correct)
  • Cutting speed
  • Smaller rake angle
  • Shear strength

    • Which factor dominantly consumes cutting power in machining?

  • Chip velocity
  • Shear power required for deformation in shear zone (correct)
  • Friction power
  • Shear strength

    • What is the equation for cutting and thrust forces during a machining operation?

  • $F = S \times A$ (correct)
  • $A = F + S$
  • $P = F + v$
  • $P = F \times v$

    • Which factor plays a role in overcoming deformation in the shear zone during machining?

    <p>Shear strength</p> Signup and view all the answers

    What is the small portion of total cutting power consumed for during machining?

    <p>Chip curling</p> Signup and view all the answers

    Which parameter is responsible for the power required to deform the material in the shear zone?

    <p>$S$ (shear strength)</p> Signup and view all the answers

    What is the specific energy of the workpiece material?

    <p>2.8 N/mm</p> Signup and view all the answers

    If the mechanical efficiency of the machine tool is 80%, what would be the metal removal rate?

    <p>18.75 kW</p> Signup and view all the answers

    What is the power drawn by the lathe during this operation?

    <p>19.44 kW</p> Signup and view all the answers

    What is the metal removal rate in J/s for the given operation?

    <p>17500 J/s</p> Signup and view all the answers

    If the metal removal rate is doubled, what will be the new power drawn by the lathe?

    <p>22.5 kW</p> Signup and view all the answers

    What happens to the power drawn by the lathe if the specific energy of the workpiece material increases?

    <p>Increases</p> Signup and view all the answers

    What is the primary purpose of a roughing cut in machining?

    <p>Removing large amounts of material from the workpiece</p> Signup and view all the answers

    Which of the following is a key characteristic of finishing cuts in machining?

    <p>Low feeds and depths, high cutting speeds</p> Signup and view all the answers

    What distinguishes finishing cuts from roughing cuts in machining?

    <p>Low material removal rates in finishing cuts</p> Signup and view all the answers

    How do roughing cuts contribute to the machining process?

    <p>Leaving some material for finish cutting</p> Signup and view all the answers

    Which type of cut focuses on creating the final dimensions and tolerances of a part?

    <p>Finishing cut</p> Signup and view all the answers

    In the context of machining, what does 'high feeds' refer to?

    <p>Rapid advancement of the cutting tool</p> Signup and view all the answers

    What type of material is suitable for drilling using Quick-Helix drills?

    <p>Aluminum alloys and copper</p> Signup and view all the answers

    What is the helix angle of Quick-Helix drills?

    <p>40°</p> Signup and view all the answers

    For which type of hole does the drill exit the opposite side of the workpiece?

    <p>Through hole</p> Signup and view all the answers

    What is the point angle of Quick-Helix drills?

    <p>100°</p> Signup and view all the answers

    Which material is NOT suitable for drilling using Quick-Helix drills?

    <p>Hardened steel</p> Signup and view all the answers

    What does a Blind Hole refer to?

    <p>A hole where the drill does not exit the work on the opposite side</p> Signup and view all the answers

    What is the purpose of using a collet chuck?

    <p>To grip small-diameter workpieces</p> Signup and view all the answers

    Which jaw movement feature distinguishes the four-jaw independent chuck from the three-jaw universal chuck?

    <p>Each jaw can be moved independently</p> Signup and view all the answers

    In a lathe, what type of work is typically held by a three-jaw universal chuck?

    <p>Cylindrical or hexagonal work</p> Signup and view all the answers

    How are the jaws of a three-jaw universal chuck designed to move?

    <p>All jaws move together</p> Signup and view all the answers

    What feature of a faceplate allows for clamping the workpiece?

    <p>Contains T slots for bolts</p> Signup and view all the answers

    What is the main advantage of using a four-jaw independent chuck over a three-jaw universal chuck?

    <p>Reversible jaws for different sizes and shapes</p> Signup and view all the answers

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