Machining Processes: Drilling and Hole-Making
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Questions and Answers

What is the depth-to-diameter ratio used for?

  • Determining if it is deep-hole drilling (correct)
  • Increasing hole accuracy
  • Reducing tool life
  • Measuring the diameter of the drill

    • What are gundrills typically made of?

  • Cast iron
  • Brass
  • Alloy-steel-tubing shank with a solid carbide or carbide-edged tip (correct)
  • Stainless steel

    • What is the purpose of a taper shank on drills?

  • To hold the drill in a taper in the end of the machine tool spindle (correct)
  • To increase the drilling speed
  • To reduce the depth-to-diameter ratio
  • To deliver cutting fluids to the cutting edge

    • When are gang-drilling machines often used?

    <p>In mass production when several related operations must be done on a single part</p> Signup and view all the answers

    What is the major feature of a gundrill?

    <p>Delivery of coolant through the tool at extremely high pressures</p> Signup and view all the answers

    What has resulted in improved hole accuracy, longer life, self-centering action, and increased feed-rate capabilities in recent years?

    <p>New drill-point geometries and TiN coatings</p> Signup and view all the answers

    What can happen if a high-speed steel (HSS) drill is not reground properly after wear?

    <p>The original drill geometry may be lost</p> Signup and view all the answers

    What is required to hold straight-shank drills with sizes up to 3/8 -in. diameter?

    <p>Some type of drill chuck</p> Signup and view all the answers

    What can accelerate early tool failure and degrade the hole-drilling process?

    <p>Poor surface conditions</p> Signup and view all the answers

    What type of drills are usually used for sizes up to 3/8 -in. diameter?

    <p>Straight-shank drills</p> Signup and view all the answers

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