Drilling Machine
Drilling machine is one of the most important machine tools in a workshop.
Drilling is a metal cutting process carried out by a rotating cutting tool to make circular holes in solid materials.Tool which makes hole is called as drill bit or twist drill
Drilling Machine:
A power operated machine tool which holds the drill in its spindle rotating at high speeds and when actuated move linearly against the work piece produces a hole.
The different types of drilling machines are:
- Portable drilling machine (or) Hand drilling machine.
- Sensitive drilling machine (or) Bench drilling machine.
- Upright drilling machine.
- Radial drilling machine.
- Gang drilling machine.
- Multiple spindle drilling machine.
- Deep hole drilling machine.
Bench drilling machine:
The simplest type of the sensitive drilling machine is shown in the figure with its various
parts marked. This is used for light duty work.
- These are light duty machines used in small workshops.
- Also called Sensitive drilling machines because of its accurate and well balanced spindle.
- Holes of diameter 1 mm to 15 mm.
- For normal drilling, the work-surface is kept horizontal. If the holes are to be drilled at an angle, the table can be tilted. Different spindle speeds are achieved by changing the belt position in the stepped pulleys.
Working:
- Work piece with the exact location marked on it with the centre punch is clamped rigidly on the work table.
- spindle axis and center punch indentation are in same line.
- Machine is started and drill bit is lowered by rotating feed handle.
- Drill bit touches the work and starts removing material.
Radial drilling machine:
These are heavy duty and versatile drilling machine used to perform drilling operate on large and heavy work piece.
- The arm is supported by a pillar (column). It can be rotated about with the pillar as centre. 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.
- The variable-speed gear box provides a large range of R.P.M. The spindle can be rotated in both clockwise and anticlockwise directions. Angular holes can be drilled on machines having tilting tables. A coolant tank is mounted on the base.
Working:
- Work piece is marked for exact location and mounted on the work table.
- Drill bit is then located by moving the radial arm and drill to the marked location.
- By starting drill spindle motor holes are drilled.
Types of Drilling Operations:
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