Introduction to Drilling and Boring Machines
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Questions and Answers

What is the primary purpose of a drilling machine?

  • Producing a cylindrical hole of required diameter and depth on metal workpieces (correct)
  • Performing cutting operations on metal workpieces
  • Polishing the surface of metal workpieces
  • Boring large holes in metal workpieces

    • Where is the drill fitted in a drilling machine?

  • Drill head
  • Column
  • Base
  • Spindle (correct)

    • How is the depth of the hole controlled in a drilling machine?

  • By rotating the drill head
  • By adjusting the speed of the spindle
  • By moving the table up and down (correct)
  • By adjusting the voltage of the electric motor

    • Which part of a drilling machine is designed to rest on a bench, pedestal, or floor?

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

    What is mounted on top of the column in a drilling machine?

    <p>Electric motor</p> Signup and view all the answers

    Why is a drilling machine considered cost-effective for drilling operations?

    <p>It can produce holes at a low cost and in a short time</p> Signup and view all the answers

    What type of drilling machine is designed for handling medium-sized workpieces?

    <p>Upright drilling machine</p> Signup and view all the answers

    Which drilling machine is named so due to its ability to be carried and used anywhere in the workshop?

    <p>Portable drilling machine</p> Signup and view all the answers

    What type of drilling machine is ideal for drilling small holes at high speeds in light jobs?

    <p>Sensitive drilling machine</p> Signup and view all the answers

    Which drilling machine is supplied with a power feed arrangement and can handle holes of up to 50mm diameter?

    <p>Upright drilling machine</p> Signup and view all the answers

    Which part of the sensitive drilling machine can be adjusted vertically to accommodate workpieces of different heights?

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

    What connects the drill spindle and the driving motor in the sensitive drilling machine?

    <p>'V' belt and cone pulleys</p> Signup and view all the answers

    Which part of the upright drilling machine can be raised or lowered to accommodate workpieces of different heights?

    <p>Radial arm</p> Signup and view all the answers

    What is the main reason for the name 'Radial Drilling Machine'?

    <p>The presence of a radial arm that can swing around</p> Signup and view all the answers

    What distinguishes the Sensitive Drilling Machine from other types of machines?

    <p>The hand feed feature for sensing drill progress</p> Signup and view all the answers

    What is the purpose of a countersink?

    <p>To enlarge the top of holes conically</p> Signup and view all the answers

    Which part of a twist drill is responsible for maintaining the alignment of the drill and the straightness of the hole?

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

    How many flutes are typically found on a tap for cutting threads on the inside of a hole?

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

    What is the function of the shank on a twist drill?

    <p>To hold and drive the drill</p> Signup and view all the answers

    How are countersinks different from counter bores?

    <p>Counter bores have a different angle for cutting edges</p> Signup and view all the answers

    What do the flutes on a twist drill allow for?

    <p>Allow chips to escape and make them curl</p> Signup and view all the answers

    Which type of drilling machine is used for reproducing the same pattern of holes in a number of identical pieces?

    <p>Multiple spindle drilling machine</p> Signup and view all the answers

    What should be used while drilling in a deep hole drilling machine?

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

    Which factor is NOT considered when specifying a drilling machine according to the text?

    <p>Weight of the operator</p> Signup and view all the answers

    What is the function of a counter bore in drilling?

    <p>To enlarge the top of a previously machined hole</p> Signup and view all the answers

    Which tool removes a smaller amount of material and gives a better finish in drilling?

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

    What holds the workpiece firmly on the machine table to prevent rotation?

    <p>'T' - bolts and clamps</p> Signup and view all the answers

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