Working with a good tool is always exciting: the screws and screws are swirling fast, like clockwork. Therefore, starting to carry out installation work in the apartment, it does not hurt to think about a quality screwdriver. How to choose this tool in the farm and find out the product features
Content
The most demanded tool for installation, construction or household situations that arise in apartments is often and unexpectedly, is a screwdriver.
Screwdriver design and operating principle
Screwdriver is a small tool reminiscent of the appearance of the gun. Screwdriver construction consists of:
• Enclosures
• Handles
• cartridge
• Start buttons.
The working body of the tool is a clamping chuck securing the tooling, which screws the fastening elements. Dimensions of the diameter of the cartridge can reach 13 mm, which makes it possible to use a different tool for the diameter of the shank, therefore, the larger the diameter of the cartridge, the more efficient the screwdriver is.
Since the screwdriver is electrical equipment, the following basic elements are located in the body cavity:
• DC motor
• planetary reductor
• Pulse regulator.
The control element of the screwdriver is the start button, which supplies the voltage to the pulse-width regulator. As part of the pulse regulator there is a switch that changes the speed of the motor. For these purposes, a powerful transistor is used to start the motor. The degree of opening of the transistor determines the PWM (pulse width modulator).
In the screwdriver scheme, a DC motor is used, with permanent magnets arranged in a circle. The anchor of the electric motor is made of electrical steel with considerable magnetic permeability. In the grooves of the armature there is a winding that opens onto the collector plates. Contact with collector plates is due to engine brushes. The torque is transmitted using a planetary gear. The gear unit includes:
• gears receiving rotation from the motor shaft
• outer sleeve, which transmits
• A disk with spring-loaded fingers.
When choosing a screwdriver, the main attention is given to the values of the torque and speed parameters.
The screwdriver device and the operation scheme for most models are identical.
More detailed information for those wishing to know thoroughly, from what elements the screwdriver consists, is presented in the video.
Having learned the anatomy and the features of the screwdrivers, the question naturally arises: "How to choose the battery screwdriver suitable for work".
The main differences are in the types of screwdrivers, which are divided into household and professional. The division into such types is inherent in any models and will depend on the power of the tool, the size of the cartridge and the nutrient element (battery base).
Cordless base of screwdrivers
A special feature of screwdrivers is the nutrient elements of the tool. If you plan to use the tool permanently, Li-Ion batteries are the most suitable option for work.
Nutrient elements of the instrument are divided into several types:
• Li-Ion batteries
• Ni-Cd batteries
• Ni-Mh rechargeable batteries
• Electrical.
The most common nutrient element are Li-Ion batteries. These batteries are designed for 3000 cycles of charge-discharge and are designed for continuous use. Battery battery is lightweight and fast recharging. It is not recommended to recharge and discharge the battery completely. Let's say that a good screwdriver is equipped with a Li-Ion battery with a voltage of 10.8 V. By the way, a battery-powered 18-volt screwdriver is able to work in shock mode.
Ni-Cd batteries are rated for 1500 charge-discharge cycles. The capacity of Ni-Cd batteries is about 5 years. The batteries are charged using a charger for a screwdriver. The charger is in most cases included with the instrument. Storage of this type of battery is preferable in a discharged form.
Less common than rechargeable batteries such as lithium-ion (Li-Ion) and nickel-cadmium (Ni-Cd) are rechargeable Ni-Mh batteries. The number of cycles of such batteries is about 1500 charge discharges. Unlike the two above-mentioned battery types, Ni-Mh batteries do not have memory to charge. The lack of charge memory effect after long-term storage of the battery assumes complete discharge and charging again.
How to choose a good screwdriver
When choosing a screwdriver, the main criteria are:
• Operating conditions
• mobility and ease of operation
• power and performance.
With an infrequent use of a screwdriver when working in an apartment or a country house, it is preferable to buy a cordless screwdriver. With constant daily use of the tool, it is certainly better to purchase a professional electric screwdriver.
If you need to move over considerable distances during the installation, it is preferable to buy a battery tool that does not depend on the presence of the mains.
A compact set for a screwdriver, consisting of attachments and bits, a battery of many hours of operation will solve the issue of comfortable carrying out work completely.
The power and performance of the screwdriver allows you to perform works of increased complexity. To perform boring work, it is better to give a network screwdriver. For comparison: a network screwdriver with a shock mode of operation has a lower cost than similar on batteries.
However, network screwdrivers weigh more than rechargeable. Using a electric screwdriver with a torque of up to 15 Nm. it is possible to make screwing-out of self-tapping screws or household screws: to change the lock at the mother-in-law or to collect new furniture from a friend. Professional screwdriver with illumination, and even in the hands of a good master, achieves a torque of 130 Nm, but this should be sought.
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