This document describes the design and fabrication of a pneumatic drill jig. The pneumatic drill jig uses compressed air to quickly clamp components for drilling, reducing setup times. It provides rigid clamping through a piston rod and locator that are pushed upward by compressed air entering the cylinder through a valve. When the valve closes, the piston returns downward to release the clamped component. This pneumatic clamping allows for mass production with reduced operator effort and increased machining accuracy and productivity compared to manual clamping. The main advantage is quicker clamping through compressed air, while the disadvantage is requiring a separate compressor.

1. FABRICATION OF PNEUMATIC DRILL JIG
SYNOPSIS:
This project work deals with the design and fabrication of pneumatic drill jig. This
pneumatic drill jig shows the reduction in labor time, machining time, etc. this type of jig
is used for mass production for motor cover, bearing cap and other mechanical and
automobile equipments.
This pneumatic drill jig is provided with pneumatic clamping arrangement. This type of
clamping arrangement seals the setting time, making time, punching time etc. when
compressed air is taken from a convenient medium to provide pope clamping force and
good gripping to the component. As the quantity to produce is large the proposed
pneumatic drill jig fulfills the mass production requirement in the shop. Clamping can be
done by releasing the pressured air using valves.
WORKING PRINCIPLE:
The component is placed in between the jig plate and locater which is on the piston rod.
When the valve is opened, the compressed air from the compressor will enter into the
cylinder through a hole at the bottom of the cylinder. The piston inside cylinder is made
to push in the upward direction. When the piston moves the locater clamps the
component rigidly. Now the component is ready for drilling operation.
When the two way valve is close the piston will return to bottom position to release the
clamps. When we close the valve the piston will come in very high force in downward
direction, so these are chances for damage of piston. This can be repeated with the same
procedure as described above.

2. ADVANTAGES:
 The use of air cylinder reduces operator effort
 Operator effort was reduced considerably and the job made much easier and faster
 Air clamping device is quicker in action more constant in clamping proper and
more convenient than hand operated clamps and save human energy
 Increases the versatility of machining performed
 Reduces waste motions which cause fatigue to worker
 Considerable savings in time are possible from the use of air clamps
 The average ratio of clamping time for a component between manual operation
and air operation is approximately 4:1
 Increases machining accuracy because the work piece is automatically located
without any alignment to the machine tools
 Increases the productivity due to increasing the speed, feed and depth of cut. This
becomes possible due to higher clamping rigidity
 Decreases expenditure on quality control of the machine parts
 This method is used for large production quantities pressures are uniform and are
controlled by operator with minimum fatigue
DISADVANTAGE:
Need separate compressor.
APPLICATION:
It can be installed in all machine shops.

3. DRAWING FABRICATION OF PNEUMATIC DRILL JIG