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Drilling 1

The document discusses the drilling machine, its principal parts, working principle, and common operations. The drilling machine has a head containing an electric motor and spindle. The spindle holds and rotates the drill bit. The adjustable table supports and positions the workpiece. Common drilling operations include drilling holes, boring, reaming, tapping, counterboring, spot facing, and countersinking. Drilling machines are used to produce holes in metallic and non-metallic materials using rotating drill bits and linear feed motion.

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Jaydeep
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89 views2 pages

Drilling 1

The document discusses the drilling machine, its principal parts, working principle, and common operations. The drilling machine has a head containing an electric motor and spindle. The spindle holds and rotates the drill bit. The adjustable table supports and positions the workpiece. Common drilling operations include drilling holes, boring, reaming, tapping, counterboring, spot facing, and countersinking. Drilling machines are used to produce holes in metallic and non-metallic materials using rotating drill bits and linear feed motion.

Uploaded by

Jaydeep
Copyright
© Public Domain
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Assignment No.

Demonstration on Drilling Machine


Drilling machine:

Drilling machine is a machine tool designed for drilling holes in metallic and non-
metallic materials. The cutting tool is a multi-point cutting tool, known as drill.

PRINCIPAL PARTS OF THE DRILLING MACHINE:

1. Head: Head contains the electric motor, v pulleys and v belt which transmit rotary
motion to the drill spindle at a no. of speeds.
2. Spindle: spindle is made up of alloy steel. It rotates as well as moves up and down in
a sleeve.
3. Drill chuck: It is held at the end of the drill spindle and in turn it holds the drill bit.
4. Adjustable table: It is supported on the column of the drilling machine and can be
moved vertically and horizontally. It also carries slots for bolts clamping.
5. Base: It supports the column, which, in turn, supports the table, head etc.
6. Column: It is a vertical round or box section, which rests on the base and supports the
head and the table.
WORKING PRINCIPLE AND OPERATION OF DRILLING MACHINE
Drilling machine is used to produce holes in the work piece the end cutting tool used
for drilling holes in the work piece is called the drill. The drill is placed in the chuck and
when the machine is ‘ON’ the drill rotates. The linear motion is given to the drill towards the
work piece, which is called feed. In order to remove the chips from the hole, drill is taken out
from the hole so the combination of rotary and linear motion produces the hole in the work
piece.

DRILLING OPERATIONS:
The following are the most common operations performed on the drilling machine:
1. Drilling: it is an operation of producing a circular hole in a work piece by forcing a
drill in the work piece.
2. Boring: it is an operation of enlarging a hole that has already been drilled. Single
point cutting tool is used in boring.
3. Reaming: Reaming is done with reamers. It is done to generate the hole of proper size
and finish after drilling
4. Tapping: It is an operating of producing internal threads in a hole by means of a tap.
5. Counter Boring: It is an operation of enlarging the entry of a drilled hole to
accommodate the bolt head etc. Counter boring tool does it.
6. Spot Facing: It is an operation done on the drilled hole to provide smooth seat for bolt
head.
7. Counter Sinking: It is an operation to bevel the top of a drilled hole for making a
conical seat. A counter sunk drill is used in this operation.

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