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| Nail Gun |
It is a type of tool which drives nail into wood or some other type of material. It is usually operated by Compressed air (Pneumatic), Electromagnetism or by flammable gases i.e. Butane, Propane. If you're involved in wood working projects or want to fit
something on wall then a hammer is a perfect tool: cheap, simple and entirely
effective. But if you are building a two-story house, installing hardwood
floors or running your own furniture repair shop, you may require a nail gun. These powerful machines launch nails at high speed, fully
embedding them in a piece of wood in only a fraction of a second. Obviously,
such a machine can save you hours of toil and sweat. They take almost every
task out of nailing.
In other detailed designs, we will know how these popular
machines launch nails at such outstanding speeds. As it turns out, there are a
wide variety of nail guns available in markets.
See designs below.
1. Spring-loaded Design
Basically a nail gun has only two jobs:
- It needs to concentrate a great deal of hammering force into a single mechanized blow, which can be repeated very quickly.
- It needs to load a new nail after the previous nail is ejected.
There are many number of models available in markets that could handle these tasks. Since we can't look at every single model, we'll investigate a few representative designs.
The simplest nail guns use ordinary springs to generate the hammering force.
In this design, the motor (powered by a battery or household AC current) rotates two drive axles. The front axle moves a small scooper plate a metal disc with a curved groove cut into it, and the rear axle moves a gear train, which turns a small triangular metal cam. Now what happens when you pull the trigger:
1. The triangular cam turns, pushing down one end of a lever.
2. The lever pivots, pushing up on the hammer. As the hammer pushes up it compresses two springs.
3. The hammer has a small knob attached to one end. As the lever pushes the hammer up, the turning scooper plate catches hold of this knob. At the same time, the rotating cam releases the lever, which releases the hammer. The hammer is now held in place by the scooper plate.
4. As the scooper plate turns, it lifts the hammer higher and finally releases it.
5. The two compressed springs drive the hammer downward at high speed. If a nail is in position, the hammer launches it from the gun.
2. Electromagnetic Design:
One effective hammering
device is a solenoid. A solenoid is a simple sort
of electromagnet used in many machines. If you know How
Electromagnets Work, then
you know the basic
idea behind electromagnetic devices: Running electricity through a
wire generates a magnetic
field. You can amplify this magnetic field by winding the
charged wire in a coil. Just like a permanent magnet, an electromagnetic
field has a
polar orientation -- a
"north" end and a "south" end. If you put two
magnets together, the
same pole repel each other,
but the opposite poles are attracted each other.
In an electromagnet, you can
alter the orientation of the poles. If you reverse the flow of
the current, the north and
south ends of the electromagnet switch places. A solenoid is
an electromagnetic coil
which has a sliding piston inside
it. In a nail gun, the piston is
made up of magnetic
material. When you apply current one way through the coil, the
electromagnetic field repels
the magnetic piston, pushing it out. But when you reverse
the current, the
polar orientation switches and the electromagnet draws the piston
back
in. Some solenoids have
a spring mechanism to draw the piston back in. An
electromagnetic nail gun
uses such a solenoid as a hammer. When you pull the trigger:
1.
When electric current runs in a circuit through the electromagnet
so that the piston extends downward, the piston is attached to a sturdy blade.
2.
The blade makes contact with the nail, forcing it out of the gun.
3.
The piston hits an electrical switch at the bottom of
the cylinder.
4.
This switch when throwing reverses the electrical current running
through the electromagnet. The electromagnet draws the piston back in for
another hit.
Solenoids are effective and
reliable, but they have limited power output. A
solenoid gun may not be able to
drive a nail through hard substances, at least not
in a single blow.
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