An electric tool always stood many steps higher than a manual one. This is reflected in a number of indicators - speed, speed and effectiveness of the action. Thanks to such data, these units are preferred. If you do not keep a record of professional work, then almost every owner in life has such electrical devices. The main ones: screwdriver, jigsaw, drill and grinder.
Each technique has its own advantages, but there is no need to exclude the possibility of breakage. The grinder is considered the most necessary unit. It acts quickly and is applicable to many materials. But the revolutions show the maximum that bribes each user. Before you start using it, it is worth understanding the principle of work.
About design
How to understand the grinder? Understanding the principle of the entire system is not difficult. Power is supplied from 220 W, and then an asynchronous single-phase motor starts. To do this, use the "Start" button. There is a shaft that starts the device to work. One part of it is located outside the enclosure (to attach a disk to it). This is how the material is cut. Depending on the rotation, the force acting on the part changes. As a result of the action, it is the motor power that is important. If it is insignificant, then the device starts to warm up and malfunctions.
If high revs are required, then Bosch is quite suitable. This is a unique design where the manufacturer focused on the motor. And disassembling the Bosch grinder is not so difficult in the event of a malfunction. Cost matters - high power is not observed in cheap models. The gear allows you to fix the angle of 90 degrees. To prevent frequent breakdowns, the case is made of shockproof materials.
Before disassembling the grinder, you will have to carefully study the level of breakdown. The device includes:
- Body.
- Two streams of air.
- Switch.
- Anchor.
- Air deflector.
- Impeller.
- Air distributor
- Radiator housing.
This system allows you to extend the life and evenly distribute the load. There are several air flows that allow for cooling - the main, additional and combined. Such a system is simple and does not require special care.
What tools are needed?
So, we are sorting the Bosch grinder. First, the tool is prepared:
- Electrical tester.
- Screwdriver in line.
- Pliers and tweezers.
- Insulating material.
- A brush that removes dust.
- Rag.
- Needle file and alcohol.
- Stripping paper.
- Special grease.
The brand of the device itself affects which kit will be used when disassembling. For example, before disassembling a Bosch grinder, you will have to take a special screwdriver. Because the manufacturer protects the heads of the bolts for fastening. But in the end, it’s not so difficult to unscrew them. There are enough nozzles on the main key, so there is no need to worry. Before you begin to make repairs, it is worth disconnecting the grinder from the network. This is the first security rule.
Malfunctions and how to understand them
There are symptoms that make it easy to understand that a breakdown has occurred. In addition, the devices are easily repaired with their own hands. The collector is fixed on the rotor and looks like several contacts coming one after another. They are erased due to the action. Grinder brushes are made of a material that quickly becomes worthless. How to understand what needs to be changed? It’s simple: wherever the grate goes, sparks appear during the cutting period. It is also difficult to set the maximum speed when the part opens. If such a breakdown is observed, then the repair must be immediate, otherwise the damage will become serious.
To remove the brushes, you should pay attention to the manufacturer and model, because some are easy to clean, without disassembling the design. The plugs are simply removed, and on other units it is necessary to disassemble the back cover. Therefore, before disassembling the Makita grinder, it is worthwhile to understand where the brushes are located. This will eliminate unnecessary actions.
Brush replacement
There are manipulations that are performed on any electrical unit, regardless of brand and manufacturer. The old brush is removed, its seat is wiped with alcohol, soot is removed. The process of fixing a new spare part is performed in the reverse order. The brush installed in its place has a small gap. But the maximum density is unacceptable. When this rule is not respected, the part quickly fails or the unit heats up when performing an elementary cut.
When the device is assembled, it is worth checking its functioning. Each user will notice that there is no spark, heating is not present. From these signs, it is clear that the launch is correct, and the movement of the disk is not disturbed.
Why does the tool not turn on?
Before disassembling the grinder (angle grinder), you need to be prepared for additional replacements inside. It also happens that it just does not start. Most often we have to talk about the minimum voltage. Therefore, in this situation, a current check is performed. Then you have to disassemble the case, check the wiring inside from the beginning to the feed. The whole procedure is performed in stages. If one part is in order, further damage is sought.
If there is a good signal, this version is excluded. The main part of all power tools has a speed control - it will have to be checked. To do this, the lever is moved to the "maximum" position. If the brushes are broken or there is no power supply to them, the unit will slow down or start up will be completely ruled out. Brushes should not be worn out, electricity supply must go to them in full. If there is any flaw, then the old parts are changed and the installation for start-up is checked.
What else could happen?
Sometimes the spindle lock button fails. It facilitates the process of replacing disks. A problem in this area occurs due to ill-treatment or the need to remove a clamped disc. Repair is not worth it - it is better to install a new part. In addition, often not turning on occurs for other reasons (for example, the brush fuses). Even such difficulties are caused by the bearing clamp.
If the problem is in the brushes, then you need to remove them, clean the nest. If they are worn, then they are replaced. But the bearings are completely dismantled, organized to clean and put in place. If they break or wear - only a replacement. They are sold at the store. Before disassembling the Interskol grinder with suspicion of a failed bearing, you need to bring a part with you. The models are different, and the items may vary in size.
Gear malfunctions
Here is the gear, and such a breakdown happens often. Therefore, the question arises of how to disassemble the grinder gear. And the kind of part depends on its power. Allocate:
- Toothed.
- Helical teeth.
The desired speed is gained at a power of 1100 watts. According to experts, the second option has more strength and a long service life. But the installation of such a gear occurs on large angle grinders, which are used on an industrial scale. How does an inexperienced person understand that the gearbox is broken? The first sign is a change in sound when cutting a part. This is relevant at startup. So, there is a rattle and knock in places. In no case should you continue working, otherwise a more serious breakdown will occur. After that, it is worth analyzing the tool, assessing the damage to the gearbox. Then you have to change the failed part.
What you need to know before repair?
Before you begin the analysis, you will have to really assess the situation and the alleged damage. It is not necessary to analyze everything. It happens that after cutting it was packaged in a box, and the next day it stopped functioning. This can happen because she has accumulated dust. Any permissible error during operation carries with it some kind of breakdown. Therefore, it is necessary to restore the entire period of activity until a malfunction occurs.
Check
Before the first launch, it is worth visually evaluating:
- The integrity of the wire and the performance of the outlet.
- Dustiness of the performed actions (implies internal filling), periodically cleaning is done.
- If the room is humid, then during the use of the unit there will be oxidation of some contacts. This will make normal operation impossible.
- Violation of operational rules will lead to failure.
There is no need to rush. It is better at the first stage to figure out what is the reason for this phenomenon, and only after that to disassemble the device.