The German company Einhell Germany AG (pronounced "Einhell") has been specializing in the development and production of tools for construction and repair work, garden and recreation for more than half a century. Studying the product line of the company, it is not difficult to notice one feature: a large part of the manufactured tools is characterized by radical specialization. Simply put, such tools are suitable only for a single operation and for no more.
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For example, to unscrew or screw in bolts and nuts. This tool is called: the Einhell TE-CW 18 Li cordless wrench. The full name of the product sounds longer, TE-CW 18 LI BL Brushless-Solo, but the last words here indicate simply the scope of delivery.
At first sight
A tightly packed body, a strong weighty design with a bright color (a bright color will not allow the tool to get lost in a pile of parts and keys). The black rubber inserts are positioned wisely, effectively preventing the wrench from slipping in your hand.
But we still have to note the design flaw: too small the length of the engine-gearbox compartment, or, otherwise, too short a reach. The photo shows that the coupling with the mounting square is almost flush with the front of the battery. Because of this, it is impossible to reach the nut or bolt located in the recesses without an extension nozzle.
The working area is illuminated by three LEDs located along the diameter of the rubber coupling. A very thoughtful way. The LEDs are not too bright, do not blind, but rather illuminate. After pressing the start button, these LEDs continue to work for 6 seconds.
Management
There is no speed range switch for the wrench. The very principle of operation of the tool does not provide for different speed ranges. All engine operation parameters are controlled by electronics.
But there is a reverse-well, where without it? Let's just say that unscrewing nuts and bolts is sometimes more time — consuming than screwing. Especially when the bolts and nuts, as they say, "stuck".
The removable battery is fixed with a latch. There is no ejector spring that would facilitate the process of disconnecting the battery.
Operation
In this chapter, instead of boring repetitive recommendations, we decided to analyze one question. What, in fact, is the difference between a wrench and a screwdriver? The answer is: nothing! And this is the wrong answer.
A screwdriver is a tool designed for screwing and unscrewing screws, screws, self-tapping screws and other fasteners. Its main feature is the ability to work at different spindle speeds and with different torque, which is regulated by a rotary coupling with divisions. Thus, a screwdriver is a universal tool. And any universality leads to what? That's right, to reduce each indicator individually.
For example, aircraft designers have long realized that it is impossible to combine the functions of a passenger carrier, an aircraft for extinguishing fires, a fighter and a bomber in one aircraft. And the tool designers are worse than that? Nothing. They realized it, too. As a result, they developed a wrench (or boltovert). Which differs from a screwdriver in the absence of three features: the wrench does not have the usual chuck, it does not have a choice of speed range and torque adjustment, and, finally, it can not be switched to drill mode. Now the positive differences: the wrench has much more torque than the screwdriver. Bigger at times!
And, to top it off, the kick function. It is an indispensable attribute of the right wrench. This function is present only in rare models of screwdrivers, but there its effectiveness, of course, is several times lower than that of a wrench (do not forget the rule of universality).
Why is the impact function so necessary for a wrench? The fact is that tightly tightened and / or rusted joints can be unscrewed only in one way: by frequent tangential (rotational) blows that are applied in a plane perpendicular to the axis of rotation. These blows can be compared to the blows of a hammer on a wrench. But who can hit a key 3,000 times a minute with a hammer? Nobody. A wrench can. 3000 beats per minute — this is the passport frequency of the impact mechanism of our wrench. It is almost the same as the spindle speed (2900 rpm). To show the principle of operation of the tangential impact mechanism, we used a piece of a training video from another manufacturer.
Moreover. Hammer blows on a wrench are very difficult to perform with the exact force required in this particular situation. If you hit too hard — you'll rip off the bolt's cap. Unlike a hand with a hammer, the wrench independently adjusts the impact force by changing the number of revolutions of the clutch. This is the responsibility of the electronics, which compares the current speed of the spindle with the resistance of the unscrewed fastener. Thanks to this technology, the risk of breaking the cap or thread on the nut is significantly reduced.
Care
The engine and battery are the two main components of our wrench. They require attention and care. The wrench must not be stored in a damp and / or unheated room, and during storage, the reverse switch must be moved to the neutral (middle, locking) position. Regular recharging of the battery is also recommended.
Screwdriver: battery
The battery is equipped with a function to check the remaining charge. In order to use it, just press an inconspicuous button, and the red LEDs will light up to indicate the amount of energy remaining in the battery.
Conclusions
The Einhell TE-CW 18 impact wrench differs from a conventional screwdriver in its narrow specialization and, as a result, high performance. Thanks to them, the wrench deserves the title of an indispensable tool in both domestic and professional use. He will always find a job, whether it is the installation of metal structures or a car service. Any production company is probably interested in a tool that is not tied to a socket or compressor. It is obvious that the increase in the mobility of the employee proportionally increases the efficiency of his work.
Positive:
robust, reliable construction
high power
high efficiency of the impact mechanism
illumination of the working area from three directions
Cons:
short" flight " of the clutch
the need for a separate purchase of a battery with a charging station
