Production Engineering Machining: Drilling Processes Quiz
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Questions and Answers

What is the primary purpose of a drilling operation?

  • To shape the workpiece into a desired form
  • To enlarge a hole using cutting tools with only one cutting edge
  • To make a circular hole by removing metal from the workpiece (correct)
  • To produce a smooth surface finish on the workpiece

    • What is the difference between drilling and boring?

  • Drilling is used for shaping the workpiece, while boring is used for creating smooth surface finishes
  • Drilling uses cutting tools with only one cutting edge, while boring uses multiple cutting edges
  • Drilling is done on turning machines, while boring is done on drilling machines
  • Drilling removes metal to produce a circular hole, while boring enlarges an existing hole (correct)

    • What are the principal parts of a twist drill?

  • Chisel edge, web, and margin
  • Lip, heel, and point angle
  • Drill point or dead center, body, and shank (correct)
  • Cutting edge, flute, and clearance

    • What material are most twist drills made of?

    <p>High speed steel</p> Signup and view all the answers

    What is the purpose of a center punch before drilling?

    <p>To make an indentation at the center for the drill point to start</p> Signup and view all the answers

    Study Notes

    Drilling Operations

    • Primary purpose is to create holes in various materials for construction, manufacturing, or geological exploration.
    • Used to extract resources, install fasteners, or allow for the passage of fluids or wires.

    Drilling vs. Boring

    • Drilling involves creating holes in a material, usually starting from a smaller diameter and progressing to a desired size.
    • Boring is a finishing process that enlarges an existing hole with high precision, often achieving greater accuracy than drilling.

    Principal Parts of a Twist Drill

    • Point: The cutting end of the drill that penetrates the material, typically angled to facilitate initial entry.
    • Flutes: Spiral grooves along the drill's body that help to remove chips, allowing efficient cutting.
    • Shank: The non-cutting end that is held in the drill chuck, varies in diameter and length depending on applications.

    Material of Twist Drills

    • Most twist drills are made from high-speed steel (HSS), known for its durability and heat resistance.
    • Some drills are coated with materials like titanium or carbide for enhanced performance and longevity.

    Purpose of a Center Punch

    • A center punch creates a small indentation on the surface of the material before drilling.
    • Helps to guide the drill bit accurately, preventing it from wandering and ensuring precise hole placement.

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    Description

    Test your knowledge of drilling operations, the difference between drilling and boring, the geometry of twist drills, types of drilling machines, methods of holding tools on drilling machines, and other related operations.

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