Construction and working of drilling machine

Working Principle of Drilling Machine:

It is a machine which is used to drill the holes on the components or workpiece with the help of drill bits. The drill bits are also called as Multi-point cutting tools which can have their rapid impact on the Material Removal Rate(MRR) i.e. a single point cutting tool(like the one used in a lathe machine) can removes the material slowly whereas a multi-point cutting tool removes the material at a faster rate and thereby increases MRR. When the power is given to the motor, the spindle rotates and thereby the stepped pulley attached to it also rotates. On the other end, one more stepped pulley is attached and that is inverted to increase or decrease the speed of the rotational motion.

Now, a V-belt is placed in between the stepped pulleys so as to drive the power transmission. Here a V-belt is used instead of a flat belt, in order to increase the power efficiency.

Now the drill bit also rotates which was placed in the chuck and which was in connection with the spindle. As the Pulleys rotates, the spindle also rotates which can rotate the drill bit.

Now, by the rotation of hand-wheel, the spindle moves up and down in the vertical direction in order to give the necessary amount of feed to the work and this drill bit is used to make the holes on the component placed in the machine vice.

Construction of Drilling Machine:

The parts are as follows.

1. Base(Bed):

The base is made up of Cast Iron which has the capability of high compressive strength, good wear resistance and good absorbing capability(i.e. absorb the vibrations induced during working condition) and for these reasons, it acts as a base to the drilling machine.

2. Column: It is exactly placed at the center of the base which can act as a support for rotating the Swivel table and holding the power transmission system.

3. Swivel Table: It is attached to the column which can hold the machine vice in the grips and thereby, the workpiece is fixed in the machine vice to carry out the drilling operation. The Swivel table can move up and down by means of rotational motion and can be locked to the column by means of locking nut.

4. Power Transmission system:

It consists of motor, stepped pulley, V-belt and the Spindle. The power transmission is explained in the working of the drilling machine.

5. Hand wheel:

By the rotation of hand-wheel, the spindle moves up and down in the vertical direction in order to give the necessary amount of feed to the work.

Here, the rotational motion is converted into linear motion by means of a Rack and Pinion mechanism

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