An air ratchet is a tool that enables movement in a single direction. These tools are powered through compressed air. Air ratchets double up as commonly used implements such as spanners, turnstiles, jacks, winders. These devices are used by carpenters, plumbers, electricians, and other workers. Air ratchets are often used when working on tractors, heavy machines, and outboard motors. In automobile repairs, the speed and strength that air Ratchets offer make them ideal instruments for internal engine maintenance and tuning, radiator manipulation, as well as fitting and removal of spark plugs. Other common applications of air ratchets include repairs of water pumps, exhaust systems, lawn mowers, and dashboard components. A reversible air ratchet wrench is a mandatory tool in any household or lawn, which may come in handy at just about anytime.

Features and working of an air ratchet   

An air ratchet is a compact hand-held tool that facilitates manipulation of otherwise rigid structures, such as nuts, bolts, and other machine and engine components. Using this device, a bolt or a screw can be turned in a particular direction, and thereafter the handle of the ratchet can be moved back in the opposite direction freely without the screw moving, making the tool ready for the subsequent rotation. The intrinsic mechanical power efficiency of the ratchet is further enhanced through the compressed air.

Since the ratchet most often is required to be used in confined spaces, the body is designed to be slender with a compact head. The body of device as well as the gear teeth is made of reinforced metal, which allows the operator to safely apply force when using the device. All the individual components of the device are precision machined for smooth operation. By rendering all movable parts with ball bearings and incorporation of planetary gears, wear and tear due to friction is minimized. A hardened yoke prevents any chance of spreading. Many air ratchet manufactures subject the components of the ratchet to heat treatment to increase strength and durability. To further enhance the user friendliness of the device, some ratchets have a ‘forward/reverse’ dial to speed up directional changed during operation. In some ratchets, this dial is replaced with a reverse lever for changing the direction.

The air transmission system is the heart of the air ratchet , which is responsible for the torque generated. For longer life of the ratchet, this air should be clean and dry. Certain ratchets have a screened filter for the air inlet that prevents dirt and other contaminants from clogging the airway or otherwise damaging the tool. A soft santoprene elastomer grip offers the user comfort when using the device. Generally, longer the ratchet, greater the torque generated and better the handling. The torque produced by the compressed air system could vary from around 15 ft./lbs. to more than 125 ft/lbs.

The power of the ratchet is normally determined by the amount of air and the force with which it is propelled through the tool. This factor is measured as cubic feet per minute (CFM). The higher is the CFM value, better is the performance of the tool. Under normal conditions, the CFM value of commonly available handheld air ratchets hovers around the 4.0 mark, with a pressure of around 90 pounds per Square inch. The rotational velocity varies from around 160 revolutions per minute (rpm) to more than 240 rpm. Most air ratchets have an air inlet size of around quarter of an inch with the air hose size of approximately 3/8 of an inch.

What to look for in an air ratchet

For heavier, power intensive work, it would make sense to obtain an air ratchet having a greater CFM value. Additionally some air ratchets are shipped with accessory kits, which could include adaptors, oilers, and extra Wrenches of different sizes. Ideally, an air ratchet should combine slimness with resilience. Some air ratchets incorporate a reactionless ratchet technology that eliminates the need for gearing and also absorbs any kickback the tool may be subjected to by unusually tight nuts. Additionally, some ratchets have self-lubricating rotor blades. A 360 degree adjustable exhaust ensures that any forced secondary air is propelled away from the work surface. Popular manufacturers of air ratchets include Astro Pneumatic, Campbell Hausfeld, Chicago Pneumatic, Ingersoll Rand, Mechanics, Porter Cable, and TD Industrial.