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Today the construction market is represented by a wide range of tools, which provide a mechanism for measuring the tightening force. At the same time, an electronic screwdriver with a dynamometer is in special demand among specialists. It is adjustable, therefore it provides high-quality tightening of fasteners without the risk of breaking and damaging the mechanism.
Such screwdrivers are divided into three main types:
- torsion;
- limit;
- indicator.
Torsion screwdrivers are activated by bending a fixed arrow with a handle on which a special scale is located. Their measuring range is from 0 to 20 kg. m, drive size 1/2 inch. The error of such devices does not exceed 20%. The screwdrivers are easy to use as they can work in two directions. The advantages of the tool include an affordable cost, the disadvantages are the exclusion of the possibility of using in hard-to-reach places and low accuracy in measuring the moment. These devices are recommended for fixing fasteners that do not require high precision.
The limiting type screwdrivers are characterized by preliminary adjustment of the trigger torque. They are equipped with a special lock, scale and ratchet mechanism. This tool can control tightening forces from 0.5 to 150 kg. The units are available in a variety of drive sizes: 1, 3/4, 1/2, 3/8 and 1/4 inches. Screwdrivers function in two directions, their error rarely exceeds 8%.
Limit screwdrivers manage to tighten a lot of bolts in a minimum amount of time. The advantage of the tool is that you can work with it in hard-to-reach places without monitoring the indicators of the arrows.
As for the indicator type, it has a triple function. The ratchet mechanism is responsible for locking, twisting and unscrewing. The design of the screwdriver is provided with a panel with a button for turning on and measuring torque, an LED indicator, a buzzer and a button for recalling the last operations from memory. In addition, the multifunction display allows you to edit and set parameters. At the push of a button, the instrument returns to standard operation.
Thanks to indicator screwdrivers with built-in dynamometer, it is possible to monitor the behavior of the fasteners. Manufacturers also complement the design with a scale on which one or two arrows (setting and signaling) can be placed. One of the arrows is usually set when choosing the value of the tightening torque, and the second - to fix the current indicator. The fasteners are tightened when both arrows are aligned. This device is designed for double-sided operation and is used when tightening elements with both left and right threads.
The main advantage of indicator devices is that their error is up to 1%. In addition, the tool is easy to customize for any unit of measurement: kg / cm, kg / m, Nm / cm, Nm / m, ft / lb. Screwdrivers of this type can compensate for temperatures and keep the data of the last operations in memory. Upon reaching the tightening torque, the device emits sound and light indication. The disadvantage of the device is its high cost.
To expand the capabilities of torque screwdrivers, they are additionally equipped with special nozzles that allow you to work in hard-to-reach places where the head cannot reach the fasteners. The most commonly used nozzles are ratchet, horn and cap type.They differ in landing area and profile size. Thanks to such devices, a tool with a dynamometer becomes universal. Therefore, each master is recommended to have a complete set of interchangeable nozzles in a complete set with screwdrivers.
What it is?
The torque screwdriver is a modern tool that is equipped with a built-in torque gauge. Such a device is indispensable when performing high-quality tightening of threaded connections. Most often, the device is used during the installation of building structures, industrial equipment and in the field of car service. The main advantage of such screwdrivers is that they completely eliminate breakdowns and problems with the operation of the tightening elements. The tool has the ability to set the required speed, protecting the equipment from damage during tightening.
The device of a torque screwdriver can be different, it is determined by the functionality and scope of the tool. The standard design consists of a robust spring housing, a removable nozzle, an adjustment knob and a locking pin. In addition, the tool is supplemented with a measuring scale, with which it is possible to control the actuation forces. Such devices are compact and are very popular both in professional workshops and in everyday life.
