When shopping for this kind of item, it is important to understand how it works and what the typical uses are for the machine. An air compressor simply takes a volume of gas (from the atmosphere) and packs it into a smaller space, thereby building up pressure in a self contained tank. This means that the contents will freely flow out once a valve is opened, since the pressure inside the canister is greater than the air outside. This is what makes it perfect for a great variety of applications.
This includes putting air into car tires, blowing off a work bench or painting a wall. All of these items can be easily accomplished through the use of an air compressor and some simple attachments.
The units for this machine are measured in psi (or pounds per square inch), with the higher the number, the greater volume of gas is contained in the cylinder. It can be adjusted to shut off when reaching a preset value and many models can be connected to a valve to dial down the pressure as well.
The many different manufacturers offer units that have a different capacity, and some come with a double set of tanks to store the air. In addition, these tanks can be oriented in a horizontal or vertical position, depending on the application.
Most of the units come with a self contained motor which is also brushless, meaning that there is no lubrication required. The maintenance free style is best for consumers who are only going to use it for simple tasks such as putting air into their tires. However, for industrial use, a large motor and storage tanks is recommended since this will suffice to supply an entire department. Most of the motors will run on either 110 volts or 220 depending on the location and can be installed permanently in some areas.
The size of the unit will depend mainly on how many people will require access and what types of usage it will see. A small portable model will be perfect for the light duty seen by the common homeowner.
This can be a small cylinder, or the lightweight pancake style design seen more prevalently today. For contractors, a large unit might be needed since they will be employing nailing guns, air tools and possibly some painting as well.
There are also fixed and mobile models to choose from. A stationary type will be most likely permanent due to its size and power, while the mobile models have to be portable enough to easily fit on the back of a work truck. A good machine will be able to deliver a constant supply of air without labouring heavily. This has to be taken into account before purchasing because a larger model will obviously be a larger outlay.
An air compressor is one of the most versatile tools in the shop and can mean the difference between getting the job done quickly and struggling to finish.
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