Model overview
As mentioned above, all Sturm models are divided into two large groups: battery and mains. Battery-type equipment prevails - electric screwdrivers can have a power of 12, 14.4 or 18 volts. Their demand is due to their compactness and mobility.
The Sturm CD31181, CD3118C and CD30181 electric screwdrivers have a nickel-cadmium battery in their construction. They are perfect for housework, since they do not have much power, but the manufacturer has provided two rotation speeds, the ability to adjust the speed, reverse.
The grip has a rubber grip for better grip. In a fully charged state, such a tool can work for 60 minutes. Models are supplied with an additional battery, so it can be changed at any time and continue with the task at hand.
The Sturm CD3014C and CD3112C electric screwdrivers are characterized by small dimensions and low weight. They are very comfortable, but with the same speed. It is possible to adjust the number of revolutions.
The Sturm CD3010L is equipped with a lithium-ion battery. Thanks to such a battery, the charge is held longer, even during a break there is no energy loss. For the convenience of the user, a battery charge indicator is provided on the case. The Sturm CD3010L electric screwdriver can be praised for having electronic rpm and reverse control. The power button can be blocked, so accidental start is completely excluded. The user will be pleased with high-quality and correctly directed illumination.
It is impossible to ignore the Sturm ID2130, which in the entire product line of the company is one of the most compact and lightweight. Speed and RPM can be adjusted
Selection Tips
Before buying, the user should know that all Sturm screwdrivers can be divided into two large groups:
- professional;
- household.
They differ in performance, as those designed for professional use have more power and wider functionality.
When drilling dense surfaces in professional screwdrivers, the number of revolutions approaches the 1300 mark, and for those that can only work with wood, plastic and metal, this figure reaches 600 rpm.
The advantage of technology with little functionality is its cost, while more expensive screwdrivers differ in that they can solve much more complex problems. Battery models differ not only in the type of built-in battery, but also in its capacity. A professional screwdriver of this type should fully replenish the charge in an hour, while a tool for everyday tasks will take about 7 hours.
On expensive models, sometimes there are up to 22 possible adjustments, including - speed, number of revolutions, direction of movement of the drill, backlight, etc.
You should definitely pay attention to screwdrivers, which provide the ability to switch between impulse and impact modes.
Characteristics of various models
There are a large number of different models of screwdrivers on sale in any home appliance store. The choice of a suitable model is not easy, since there are many manufacturers of such equipment and they all release several new products annually. To choose the right tool, you need to familiarize yourself with the main types of these devices.
Instrument power supply methods
The power supply of such a tool can be mains or rechargeable.The advantage of models with a connection to a network of two hundred and twenty volts is that they do not require charging and, as a rule, are more powerful than battery ones.
On the other hand, battery powered devices are mobile and can be used in many places, regardless of the availability of power. In addition, modern rechargeable batteries are designed for intensive operation without recharging for a period of at least an hour. Such devices do not have a long network cable that always gets tangled underfoot. Such mobile tools are loved by both professionals and ordinary home craftsmen.
Battery types
The power supply elements of screwdrivers are based on various types of batteries. You need to understand them, since the efficiency of work depends on it. There are four main options on the market now:
- The lithium-ion (Li-lon) battery is the most expensive of all, and this is its only drawback. It does not sit down longer than the others, does not charge for long and after each charge does not lose capacity (there is no so-called memory effect). It is such a battery that is used in professional models of screwdrivers.
- Nickel - metal hydride (Ni - MH) batteries have the same advantages and disadvantages, but are more environmentally friendly. Therefore, more and more manufacturers are switching to this type of power supply.
- The most modern batteries are made with lithium polymer (Li - Pol) batteries. Their disadvantage is their short service life. But manufacturers claim that it will soon be overcome, and such batteries will surpass the competition.
- Also, the battery in the service of screwdrivers is an inexpensive nickel-cadmium (NiCd) battery. He has the longest term of use - up to five years. However, it weakly holds a charge, and due to the memory effect, its operation time decreases. But for a short home repair, it is perfect.
Some other characteristics.
Modern models of mobile screwdrivers are equipped with 12, 14, 4, and 18 volt batteries. The power of the instruments is related to this parameter. The torque for versions with an 18 V battery for a screwdriver and 14.4 volts can be the same. However, the power of a tool with an 18 volt battery will be higher and the ability to work before the charge starts to drop will be longer. Therefore, a lower voltage tool is sufficient to assemble furniture at home.
The number of operating modes ranges from one to three. For home, it is better to choose the golden mean - models with two speeds:
- First up to 400 rpm for torque-related work.
- The second up to one thousand three hundred - for drilling.
- Increased to three thousand rpm, the three-speed models are designed for professionals.
For a professional tool, there are batteries with an increased battery capacity of more than 2 A / h, for a home tool, less capacious batteries are produced. This characteristic will tell you how long the device can work without recharging.
Models and cost
The assortment of TM "Ermak" includes more than ten types of screwdrivers.
Let's consider the most popular ones.
- DSHA-12K. An inexpensive rechargeable model that will be an excellent household helper. It includes one removable 12 V battery with a capacity of 1.3 A * h. The screwdriver operates at an idle speed of up to 550 rpm, produces a maximum torque of 9 N * m. It has a minimum set of functions: reverse, blocking of pressing the button, electronic speed control. The cost of the model is about 2500 rubles.
- DSHA-18-2. A more powerful model that suits those who are engaged in construction professionally. The set of this device includes two batteries, the voltage of each of which is 18 V. The screwdriver is capable of operating at idle speed up to 1250 rpm, the maximum torque is 18 N * m. The weight of the device is 1.7 kg. The cost of the model is about 3500 rubles.
- DShE-400.It is a networked model that can be used not only for screwdriving but also for drilling holes in various materials. The device operates at speeds up to 750 rpm. Provides a torque of 15 N * m. Its weight is 1.25 kg. The set includes a replaceable set of brushes. The cost of the model is 1,700 rubles.
Advantages and disadvantages.
Ermak screwdrivers have a number of advantages.
- Wide range of. The device of this brand can be chosen by both a professional builder and an amateur for home use.
- The cost of the equipment is quite low. The Ermak screwdriver can be bought by almost everyone.
- The quality of the goods is quite high, the manufacturing process of the devices is controlled at every stage.
- The screwdrivers are guaranteed for 12 months from the date of purchase.
- All devices are equipped with keyless chucks that fit standard bits.
But the Ermak screwdrivers also have their drawbacks:
- models are not equipped with a battery charging indicator;
- when a battery fails, it is very difficult to find a new one.
Views
The Ermak trade mark offers two types of screwdrivers.
- With work from the electrical network. Such devices work only if there is a 220 volt outlet in the immediate vicinity of the place of work. On the one hand, this is not entirely convenient, since it is quite difficult to work with such a device on the street, and the cord often interferes, but on the other hand, you do not depend on the battery power and you do not need to spend time charging the battery.
- Battery operated. Cordless screwdrivers do not require a permanent connection to the outlet. Such a device can be operated even where there is no electricity, simply by charging the battery in advance. The devices are manufactured with nickel-cadmium batteries with a capacity of up to 1.3 A * h or lithium-ion batteries with a capacity of up to 1.5 A * h.
