Which type of drilling machine does a carpenter use?

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ISRO SAC Technician B Fitter 21 Oct 2018 Official Paper
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  1. Sensitive drilling machine 
  2. Breast drilling machine
  3. Radial drilling machine
  4. Gang drilling machine

Answer (Detailed Solution Below)

Option 2 : Breast drilling machine
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Explanation:

Drilling machine:

  • A drilling machine is a tool used for drilling holes in various materials, such as metal, ceramic wood, or plastic.
  • It can be either portable or stationary.
  • The principal types of drilling machines are:
    • Sensitive bench drilling machine
    • Pillar drilling machine
    • Column drilling machine
    • Radial arm drilling machine (radial drilling machine).

Breast drilling machine:

  • A breast drill is more or less a hand drill in terms of its functioning, but its design does vary a bit.
  • As per the name, a breast drill essentially has a chest plate at the end for extra support and pressure while drilling.
  • With this, you can drill into comparatively harder surfaces when compared to a hand drill.
  • Breast drilling machines are used in carpentry.

Sensitive bench drilling machine:

  • This is used for light-duty work.
  • This machine is capable of drilling holes up to 12.5 mm in diameter.
  • The drills are fitted in the chuck or directly in the tapered hole of the machine spindle.
  • For normal drilling, the work surface is kept horizontal.
  • If the holes are to be drilled at an angle, the table can be tilted.

Radial drilling machines:

  • The radial drilling machine has a radial arm on which the spindle head is mounted.
  • The spindle head can be moved along the radial arm and can be locked in any position.
  • The arm is supported by a pillar (column).
  • It can be rotated about with the pillar as the center.
  • Therefore, the drill spindle can cover the entire working surface of the table.
  • The arm can be lifted or lowered.
  • The motor mounted on the spindle head rotates the spindle.

Gang drilling machine:

  • It consists of a large base supporting a long table.
  • The top of the table is designed in such a way that several units may be mounted on it.
  • Each spindle is driven by its individual directly connected motor.
  • The table has a groove around the outside for the return of the cutting lubricant and may have ‘T’-slots on its surface for ease in clamping the work to the table.
  • This type of machine is generally preferred when the work is to be moved from spindle to spindle for successive operations.
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