Spur gears are the most common type of gear that have straight teeth projected outward from a circular wheel. They interlock easily by placing the gears next to each other with the teeth meshing and wheels on the same plane. When one gear rotates, it causes the interconnected gear to rotate in the opposite direction. Spur gears can be used to increase or decrease speed and torque and are often used in machines, vehicles, appliances, and mechanisms to transfer motion between parallel shafts or gears of different sizes.

1. What are spur gears
A spur gear generally is the most common and simplest kind of gear. It has a
wheel with teeth that are projected straight outward. Since the teeth of this
type of gear are straight, the outside of a spur gear is a circle that is flat and
faces outward uniformly. In general, this gear appears the same from both sides
as the teeth are uniformly straight all through.
Spur gears are connected easily by just placing them next to one another such
that the teeth interlock. This is carried out while making sure that the gears are
positioned edge to edge and the wheels of the gears are on the plane, even
though in a few cases the gears can be perpendicular.

2. When you rotate the main gear, the teeth on it automatically thrust forward
plus any interlocking teeth as well. Given that the two gears are placed on
parallel axes, the connected gear will rotate in an anticlockwise direction while
the main gear rotates in a clockwise direction. The gears will continue to rotate
as long as the interlocking teeth keep the two wheels in motion. The spur gears
of dissimilar sizes can be connected and in so doing allows the slower motion of
the bigger gear to be converted to faster motion of the minor gear.
The function of all gears is to convert the speed of the motor to a revolving
force, or torque required to make any device work. Spur gears are used in
different machines for a wide range of functions.

3. Even though they are quite easy to design, many different, discrete kinds of spur
gears are available. Any person who has an interest in mechanical engineering as
well as anyone who is going to carry out a project which involves the application
of any kind of gear should familiarize himself with these gears and how they are
used.
These gears are utilized to increase or reduce the torque and power of an
object. They are utilized in clothes dryers, washing machines, construction
equipment, mills, blenders and fuel lamps. In power stations, the so-called
'trains' of the spur gears convert different forms of energy like hydroelectric
power or wind to electric energy.

4. They are as well used to augment or reduce speed of a given object. For
instance, in mechanical clocks, spur gears are used to regulate the speed of
second hand, minute hand and the hour hand. They are also used in hand-held
eggbeaters to increase the speed of the eggbeater so that it can be more
effective.
The advantage of these types of gears is that they are simple to design and
cheap to make. They can be created from any hard material such as steel or
even plastic, although they have many disadvantages when it concerns their
functionality. They usually make much noise when two gears rotate together
since the teeth strikes one another quickly.

5. Spur gears can generate a whining noise when on high speed which makes
them inappropriate to be used in devices where noise is a concern. Another
downside is that you must set up a spur gear on a parallel shaft that creates
a particular design restriction.
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