Question
Download Solution PDFWhich type of drilling machine does a carpenter use?
This question was previously asked in
ISRO SAC Technician B Fitter 21 Oct 2018 Official Paper
Answer (Detailed Solution Below)
Option 2 : Breast drilling machine
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Download Solution PDFExplanation:
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.
Last updated on May 28, 2025
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