No construction process takes place without a tool, be it an electrical or battery device. Many builders are grateful to the creators of the screwdriver for the speed of screwing and unscrewing the screws. But what to do if these same actions need to be done with a nut? Workers and here will not remain without attention of manufacturers of the tool. For this purpose, a wrench was created - a device that is in demand both in construction and in everyday life.
When choosing a wrench, you must consider the power, the number of revolutions, engine, weight, and the time of use of the device.
How to choose a wrench so as not to overpay and go to the service center in a month? This question arises for each customer, because the tool is divided into certain classes in terms of power, number of revolutions, torque, type of performance, engine and even weight. The time of using the device also plays a significant role, because the most powerful and professional wrench will not be able to work constantly, and cheaper models are designed for operation no more than 2 times a week.
The main purpose of the wrench
The device is an electric wrench.
The name itself perfectly describes the possibilities of the wrench - working with nuts and thread. It greatly simplifies and speeds up the process of tightening or loosening the nut. He will be an indispensable assistant in the fight against "thick" nuts or rust; he will perfectly cope with his function in a hard-to-reach place. A special feature of the wrench is its ability to control the twisting force, so the power thrust will always be calculated correctly.
The wrench looks like a drill, but highlights its special nozzle for the nut, which is located on the drill. With its help, the tool fixes the nut in a certain position and only after that begins rotational movements. Not only motorists choose a device, but also ordinary people when making repairs. Metallic, wooden or plastic constructions require reliable and strong fastening. This is where this tool comes in handy.Back to table of contents
Pneumatic wrench is convenient to use, as it has a large torque.
Depending on the direction of rotation, the axis of the holder is distinguished by a straight and an angular wrench. The angle device is designed to work in the most inaccessible places that are difficult to reach, but the twisting force is much less than that of a straight wrench. If we consider the tool from the side of the drive, we can distinguish such models as:
- unstressed and shock.
By far the most convenient will be the battery device due to its autonomy and independence from the power supply. Ease of use is the absence of cords, and a set of nozzles will help to cope with any task. It works on the principle of pulse rotation, so the owner has the opportunity to regulate the necessary rotational power (100 Nm - 500 Nm) and switch the direction of movement.
Pneumatic wrench is lightweight and high torque.
The tool works on an autonomous pneumatic power source.
Impact wrench is used in difficult situations, for example, when working with a rusted nut.
If you need to make a little effort, then choose the direct type of performance, but the impact wrenches are indispensable in the most difficult situations (especially when the nut rusted). To unscrew it, you need to exert maximum effort. If you need to work with complex frameworks and structures, it is better to choose a hammerless tool. These models are designed to tighten the nuts or remove them (in the presence of the reverse). But impact wrenches are used in cases when it is necessary to precisely control the thrust force. Some devices of this type are equipped with electronic control systems.
The most silent and powerful tool is an electric wrench, but for its operation an AC network is needed. Small and light, with a small level of noise, they are used in the work of professionals. Only the torque is in the range from 40 to 6000 Nm, and the direction of twisting can be set separately (clockwise or against its movement). In the discharge of the most powerful models is the hydraulic type of the tool. Its operation is ensured by the oil flow, which is under pressure from the pump. The torque range is 200-6500 Nm. A distinctive feature is the ability to work at the lowest temperatures. The tool is not afraid of dirt.Back to table of contents
Main instrument characteristics
When choosing a pneumatic type tool, always pay attention to the manufacturer. Sometimes this criterion becomes the main one. This is not always justified, because the brand is just a well-known brand, and the buyer needs a wrench for a specific task, therefore the first criteria for selection should be:
Technical characteristics of pneumatic wrenches.
- rotational speed;
- maximum effort;
- operating pressure;
- air flow;
- presence of reverse;
- size of the landing square;
How to choose a wrench among so many parameters? Some identify the most important for their work and focus only on them. For example, if the tool will be used only in everyday life several times a year to unscrew or twist the simplest and most uncomplicated thread, then you can safely choose a lightweight and low-power device with a landing square in half an inch. Head size - from 8 to 36 mm, tightening torque - up to 1023 Nm.
Nevertheless, its design depends on the functionality of the pneumogunker. A tool that is designed for large nuts, and the force must apply proportionate, so the engine must be powerful. And the more powerful the device, the larger its dimensions. Small models are designed to work with small sizes, often found with the angular placement of the shank. By torque, you can determine the force with which the device can tighten the nut. Choosing this product characteristic, find out what you need to do with a pneumatic wrench: unscrew small and medium-sized nuts and bolts or work with great details.
The advantages of pneumatic wrenches.
There are cases when replaceable heads of different size are needed, then it is better to pay attention to a foreign manufacturer. If you need a key size of 10-27 mm, then the landing square should be chosen half an inch, and the shock heads of the square should be 8-36 mm. A key size up to 41 mm will require a 3/4 inch square, and the torque of the wrench should be chosen more powerfully (up to 1900 Nm). With the large size of the nuts wrench cope with a landing square of 1 inch and a torque of 5000 Nm. As for the torque control, it is not present on all models, and in some (China) is unreliable, as it quickly fails. This is one of the “sick” places of the wrench, because none of the manufacturers can guarantee the accuracy of its work.Back to table of contents
Tips before you buy
Long-term operation is provided to those tools that work on the oil recommended by the manufacturer. A quick wear rubber parts - the consequences of a banal non-compliance with the rules of use. A pneumatic wrench is required to operate the compressor, and a clean and dry air mixture must come to the device. This can be achieved using a filter.
Be sure that the compressor must be suitable for pneumatic wrench. This is checked by the ratio of working pressure and compressed air consumption, and the performance of the compressor can not be lower than that of the working tool. Do not forget that all models of the instrument require constant lubrication or the presence of a lubricator. Proper selection and operation is the key to a long and efficient tool life.