Screwdriver "Makita"
Description, general information
produces various power tools, including screwdrivers. The company began its history at the beginning of the 20th century, and to this day it continues to delight consumers with its high-quality products. Let's look at the general features and characteristics of the models of this company.
Makita screwdrivers are very powerful. The average speed for various models is about 2300 rpm, which is a good indicator compared to other brands. The weight of most instrument models is within 1.5 kg. Its small mass means that such a tool will be comfortable to work with. The manufacturer also took care of the convenience of working in poorly lit rooms, making most models backlit with LEDs. Separately, it is worth highlighting the type of handle for holding these tools on weight. As a rule, they are made with rubber, and therefore they are convenient to hold in the hand, and accordingly, the work process is much easier.
The disadvantage of these screwdrivers is the strong vibration of the handle during operation, as well as their short-lived batteries. In addition, the price of this company’s products is quite high, which is important for domestic consumers.
Diagram, device of a Makita screwdriver
Let's look at the design of a screwdriver on a specific model 6271D. The diagram of this model is presented in the figure below.
Scheme 1
The diagram shows:
- Shift lever
- Housing assembly
- Nameplate
- Screw
- Spring
- Reverse shift lever
- Start button
- Contact terminal
- Screw
- Keyless chuck
- Gearbox assembly
- Electric motor
- Screw
- Housing assembly
- Charging node
- Battery
A modern screwdriver is a high-tech device. Important design elements:
- Removable battery
- Rubberized handle grip
- Powerful electric motor
- Metal planetary gearbox
- Soft start button
- Reverse switch button
- Torque regulator
These are the main components of the screwdriver design, which are included in the basic package of any screwdriver model.
Disassembling a Makita screwdriver
To disassemble the screwdriver you will need a Phillips screwdriver and a little personal time. To disassemble the screwdriver completely, you need:
- unscrew the housing mounting screws;
- remove the composite start button mechanism;
- remove the electric motor together with the gearbox;
- disconnect the gearbox from the engine by unscrewing the bolts holding them together.
To disassemble the screwdriver battery, you need to unscrew the bolts connecting the case, or separate the adhesive-based connections of the case using a soldering iron. Inside the battery there are several nickel-cadmium batteries that have a certain capacity and carry a charge. If the battery is repaired, they must be replaced with new ones.
The cartridge is changed using a screwdriver and a hex key. First, you use a screwdriver to unscrew the mounting screw in the cartridge, rotating it clockwise. Then the hexagon is inserted, the reverse button is turned on, it is clamped, and then the cartridge gives in easily.
Description, general information
produces various power tools, among which are screwdrivers. The company began its history in the 20th century, and to this day it continues to amuse consumers with its high-quality products. It is necessary to consider the general features and properties of the models of this office.
Makita screwdrivers are very powerful. The average speed for different models is about 2300 rpm, which is a good indicator compared to other brands. The weight of most instrument models is 1.5 kg. Its low weight means that in fact, such equipment will be comfortable to work with. The manufacturer also took care of the convenience of working in poorly lit rooms, making most models backlit with LEDs. Separately, it is worth highlighting the type of handle for holding these tools on the weight. You, they are made of rubber, so they are comfortable to hold in your hand, and accordingly, the work process is much easier.
Read also: Changing the point of connection to electrical networks
The disadvantage of these screwdrivers is the powerful vibration of the handle during operation, as well as their short-lived batteries. Already today, the cost of the products of this company is quite high, which is important for the Russian consumer.
Malfunctions of the Makita screwdriver
The most common screwdriver breakdowns are as follows:
- The screwdriver does not turn on. Everything is clear here. The first thing you need to do is inspect the battery, as well as the contacts and connections in the case, and the wiring. A multimeter will help you check.
- The reverse button does not work. This means that you will not be able to either tighten or remove screws and bolts. Here you should check the resistance of the button with a multimeter by placing test leads on the input and output wires of the button.
- The speed controller does not work. In this case, the speed will be either constantly reduced or constantly increased. The regulating transistor or brushes may be to blame here. A visual inspection of the parts is required.
Makita screwdriver repair
Repair of Makita screwdriver button
The tool's on/off button is a complex electronic mechanism. It consists of several constituent elements:
- start buttons;
- reverse buttons;
- speed switch buttons;
- engine soft start buttons.
When repairing a button, you first need to disassemble it by unscrewing the screws securing the case and disconnecting the battery. After this, you must check the connections and contacts for contamination and clean them. If cleaning the contacts does not help resolve the problem, the button assembly should be replaced.
Repair of Makita screwdriver charger
When repairing the charger, it is necessary to unscrew the screws holding the housing covers together. Inside there is a printed circuit board with contacts. First you need to check the transformer with a tester. To do this, you need to measure the voltage at the output. Then you should ring the cable to prevent it from breaking. Then the primary and secondary windings of the transformer and the fuse are checked. You need to assemble it in the reverse order.
Makita screwdriver battery repair
When repairing the battery, use a Phillips screwdriver to unscrew the screws securing the case. There are several cans inside the case. Using a visual inspection, it is necessary to inspect them and identify irregularities in geometry, such as swelling, for example. We test the banks using a multimeter for the presence of residual charge. If it is missing, the bank is replaced with a new one.
Repair of the Makita screwdriver gearbox (diagram)
To remove the gearbox, you need to disassemble the housing by unscrewing the screws with a Phillips screwdriver. We take out the start button, the reverse switch button, and disconnect the bolts securing the engine to the gearbox. Then you need to remove the contents of the gearbox (various gears), the speed switch washer. When inspecting an empty gearbox, special attention should be paid to the teeth located around the circumference of the gearbox housing. If they are worn out, the gearbox will not be able to perform its function: the speed switch will not work correctly. To restore the teeth, you need to use small bolts, inserting them in place of the original plastic ones. Reassemble the gearbox in reverse order. The gearbox diagram is shown in the figure below. It shows the general diagram of the gearbox.
Scheme 2
How to install a similar button on a screwdriver.
When repairing the battery, use a Phillips screwdriver to unscrew the screws securing the case. There are several cans inside the case. Using a visual examination, you need to look at them and identify irregularities in geometry, such as swelling, for example. We test the jars using a multimeter to determine the presence of residual charge. If it is missing, the bank is replaced with a new one.
To remove the gearbox, you need to disassemble the housing by unscrewing the screws with a Phillips screwdriver. We take out the start button, the reverse switch button, and disconnect the bolts securing the motor to the gearbox. Then you need to remove the contents of the gearbox (different gears) and the speed selector washer. When inspecting an empty gearbox, special attention should be paid to the teeth located around the circumference of the gearbox housing. For which the design of their wear is intended, the gearbox will not be able to perform its function: the speed switch does not work correctly. To restore the teeth, you need to use small bolts, inserting them into the original plastic ones. The gearbox must be assembled in reverse order. The gearbox diagram is shown in the figure below. He presents a general diagram of the gearbox.
The brushes used for the screwdriver have a graphite base. Their price currently varies between 2 and 5 USD. e. They are located in the electric motor housing and consist of two graphite cubes mounted on iron plates. With intensive work, they wear out and wear out.
When performing repairs at home, there is an option to sharpen them with ratfile from brushes from another tool, for example, a car starter. After recessing, they should be inserted into the brush holder and placed next to the area, assembling the engine.
This chuck is used to clamp bits with a cylindrical shank. This popularly rumored cartridge is easy to install. It installs with almost one hand movement. Used for drills with diameters from one book to 10 mm. This is a movable structural element in the instrument, which is why it often breaks. To disassemble it, you need to read the tips described in the first article on disassembling the cartridge using a hex wrench and a Phillips screwdriver. The cost of this product is about 20 USD. e.
The material in this article came out great. Here we outlined what our client can do, the possible problems that arise when using Makita screwdrivers, told us how to remove them with our employees, and separately talked about the various structural elements that make up the base of any screwdriver. The article contains diagrams of the gearbox and the general design of the screwdriver. We hope that the information will be useful to you.
Source
Brushes for Makita screwdriver
The brushes used for the screwdriver have a graphite base. Their cost today varies between 2–5 USD. e. They are located in the electric motor housing and consist of two graphite cubes mounted on metal plates. With intensive work, they wear out and wear out.
When doing DIY repairs, you can sharpen them with a file from brushes from another tool, for example, a car starter. After recessing, they should be inserted into the brush holder and put in place, assembling the engine.
Design and principle of operation
The gearbox is a complex mechanical transmission unit through which the axis of the motor-power unit transmits torque to the cartridge.
Two or three transmission stages are installed in the gearbox.
The design of the “household” dual-mode screwdriver assembly includes:
- The plastic case is a small drum that is mounted on a cartridge. The body itself is fixed motionless, and the chuck shaft is inserted into a clamp on one of the transfer plates;
- 2 or 3 transfer plates (carrier) - a round metal plate, on one side of each there are 3 protrusions for small gears. On the other side of one of them there is a clamp for the chuck shaft, and the other (or 2 others) has another so-called. a “planetary” gear that rotates three small gears;
- 6 or 9 small gears (three each: they can be of the same or different thicknesses) are the so-called “satellite” gears, which are installed and rotate freely on the projections of the transfer plates. With their teeth they interact with the sun gear located between them and with the ring gear, which is located on the inner surface of the housing;
- ring gear - a metal ring with teeth on the inside and small protrusions on one of the rings on the outside. It is placed on these protrusions and ball bearings on the inner surface of the housing.
The parts are lubricated, assembled in series and installed inside the ring gear, which lies inside the housing drum (it has a seal with recesses for ball bearings and gear lugs). After this, the surface of the open satellites is covered with a metal washer, in the center of which there is a hole into which the engine shaft enters with another gear attached to it.
During operation of the screwdriver, the gear wheel on the motor shaft rotates the upper satellites, and they, spinning around their axis and, along the ring gear, respectively, transmit movement to the next carrier. Depending on the number of plates and small gears, the rotation speed will decrease proportionally.
As can be seen from the design of the gear unit, they are divided depending on the number of transfer plates into:
- two-stage.
- three-stage. In this case, another plate with a “planetary” gear and 3 satellites is added to the design.
Reference. The number of speed modes of the device depends on the presence of stages, and this, in turn, will affect its cost.
Another indicator by which gearboxes are divided is the material from which their parts are made.
In the production of satellite gears the following is used:
- plastic. Such structures are relatively lighter, but their reliability is lower than that of their metal counterpart;
- metal. They are durable and with proper care and lubrication they will work like a clock.
Important. The disadvantages of metal parts are a continuation of their advantages - they are heavier than plastic ones and are more expensive. Moreover, if a screwdriver is used without violating the operating rules 2-3 times a year, the master most likely will not feel the difference in what material the gearbox parts are made of.
READ How to Remove a Drill Bit from a Makita Hammer Drill
Makita quick release chuck
This chuck is used to clamp bits with a cylindrical shank. This cartridge is easy to install. It is installed literally with one movement of the hand. Used for drills with a diameter of one to ten millimeters. This is a movable structural element in the tool, so it breaks frequently. To disassemble it, you need to read the tips described at the beginning of the article on disassembling the cartridge using a hex key and a Phillips screwdriver. The price of this product is about 20 USD. e.
The material in this article turned out to be voluminous. Here we described all possible problems that arise during the operation of screwdrivers, told how to eliminate them on your own, and separately talked about the various structural elements that form the basis of any screwdriver. The article contains diagrams of the gearbox and the general design of the screwdriver. We hope that the information will be useful to you.
