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How and which one to choose an eccentric sander. Characteristics, brands and useful features.
Choosing a tool - an eccentric grinder
When using an eccentric sander, you can grind and polish wood, metal, organic glass and various varnished surfaces, and also remove paint from any material.
This commonly heard tool is suitable for most tasks solved in the workshop. After all, a clean, smooth surface is not only a design move, but also a serious requirement for some repairs, for example, preparing the surface for painting.
Do-it-yourself car body polishing
Over time, the paintwork becomes dull and loses its shine. As a result of physical and chemical exposure to the external environment, microcracks, chips and scratches appear on it. This spoils the appearance of the car and shortens the life of paint and body parts. It is possible to restore the original shine and smooth surface without partial repainting. Sometimes polishing the body is enough to eliminate paint defects. Like polishing a windshield with your own hands, this operation does not require serious experience or expensive equipment.
Features of vibrating grinders
Observing the principle of operation, an eccentric sander is not entirely different from an orbital sander or a grinding wheel. This means that, together with the known movements of the vibratory grinder, it makes rotational movements of the grinding wheel. The result of this grinding method is the highest productivity and especially a smooth working surface.
The secret of the good properties of the processed surface lies in the composition of movements consisting of rotations and vibrations: the rotational movement ensures the removal of material, and with the help of vibration a smooth surface is created. In this case, the round sanding plate is movably attached to the drive shaft and rotates around its own axis parallel to the working surface freely, or under pressure. Maintaining pressure increases the chip removal performance, so even rough grinding work can be done.
Technical characteristics of eccentric sanders
A significant parameter that influences performance is the diameter of the vibration circle, which is also called working, ground, in other words, eccentric stroke. The higher the stroke, the higher the performance. The force with which the user presses on the tool during operation also affects the result of grinding.
Please note that the highest chip removal performance is not necessary. For example, when working with painted or varnished surfaces, accuracy is more important. Data on the diameter of the vibration circle indicates the accuracy with which it is possible to work.
When sanding smoothly, strong pressure slows down the rotation of the sanding pad, which ensures a particularly good final result. The basic rule says: the smaller the circle, the cleaner the grind, and vice versa. Thus, a small vibration circle is not only suitable for spotless grinding, but a large one (in combination with a massive motor) is for processing large surfaces with the highest chip removal performance.
Attention! The higher the speed of the grinder , the faster and at the same time rougher the surface treatment. Solid tools are characterized by the highest performance.
Brake system for grinders.
Eccentric machines from some manufacturers will first be applied to the surface being treated and then turned on. The sanding pad brake, or simply put, an automatic braking system, prevents the formation of grooves when the pad is placed on the material, if the machine is already turned on.
The diameters of the sanding pads for eccentric sanders , 115, 125 and 150 mm, are the most convenient. Often, the very name of the instrument contains an indication of the size of the plate. Sanding pads with a diameter of 115 and 125 mm are especially good for processing concave and convex surfaces, and also various curves. The 150mm plates, on the other hand, are not just suitable for rough work and are designed for huge flat surfaces. As a result, with a larger diameter of the grinding plate, depending on the grain size of the grinding wheels and the vibration circle, the grinding performance is higher. If you need precise work in narrow places, a machine with a plate of the smallest diameter is preferable.
Most eccentric sanders have a dust extraction function. It can be done using several methods: through the sole, using a dust extractor, or alternatively using a hose and a dust bag. Of course, models where you can disconnect the dust collector or change its position.
Sander polishing technology
Working with a tool is in many ways similar to polishing yourself, but most of it is done automatically - you need to carefully monitor this. Processing of the car begins with installing the desired polishing wheel and accelerating the device to 1200-1500 rpm. Then the disk is simply pressed against the surface of the body and moves along its plane. The process requires constant monitoring:
- Uneven pressure is more dangerous than strong pressure (leads to uneven nail polish removal).
- Strong pressure is more dangerous than weak pressure (it can cause severe abrasion of the paintwork).
The car body heats up during processing, so you can’t stop in one place. Local overheating can lead to cracking and peeling of varnish and paint, so heat must be carefully controlled. The high speed of operation of a car polishing machine leads to rapid clogging of the circles - it is necessary to periodically change them so that paint residues do not spread across the surface of the car. Periodically, you need to turn off the tool and carefully inspect the treatment area, remove the resulting dust with napkins, while at the same time wetting the surface with water or cleaning liquid.
Polishing is done with a fine-grained abrasive, but even ordinary dust can act as such. For this reason, and also because the car heats up during polishing, the treatment should be carried out in a closed room, protected from dust and sunlight. When heated above 90°C, acrylic enamels can completely lose their shine, and when sanding a car under the sun, such heating is not uncommon.
Lesson No. 24 Orbital and eccentric sanders, what is the difference. Overview of risks (painting)
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The Russian automotive industry offers a wide selection of grinding accessories. They can be included in the standard equipment of the machine or purchased additionally. Accessories include various types: abrasive, self-adhesive or clamping, on a cardboard or rag base, and additionally of various grain sizes. The smaller the grain size, the rougher the processing.
For polishing, eccentric grinders are equipped with special polishing wheels. Of course, also special wheels for processing wood and coatings, a cotton cloth for removing rust and coarse dirt, a cloth for rubbing in polish, a polishing sponge for rubbing in wax, a special felt cloth for polishing “to a shine,” etc.
Method of fastening consumables.
Replaceable sheets are attached to the sole of eccentric sanders. They are attached to the working plane of the tool using a clamp or Velcro. Models with clamp mounts are cheaper and more versatile, as it is easier to select consumables. But Velcro fastening is faster and more convenient.
What materials and tools are needed to polish the body?
If you have time and patience, you can polish your car only with a rag and polish. However, high-quality processing requires special equipment and auxiliary materials. You will need:
- felt fabric;
- napkins;
- white spirit or special degreaser;
- rubber scraper;
- protective tape;
- polishing felt wheel;
- grinding discs (for abrasive polishing);
- mandrel for attaching wheels to a grinder;
- protective glasses;
- polishing machine.
Before polishing, you need to wash the car body. Otherwise, abrasive dirt particles may damage the paintwork during processing.
Tip : Do not polish your car with a cordless sander. The battery charge does not last long, after which you will have to take a break to recharge. During this time, the polishing composition will harden and lose its properties.
It is better to polish your car in a closed, well-lit room. The air temperature must comply with the recommendations of the polish manufacturer.
Additional features of eccentric sanders.
Some models allow changing the sole. For example, installation of soles with a diameter of 115 and 125 mm, created for various volumes and types of work.
ergonomics. Some domestic manufacturers equip their tools with special vibration pads on the handles that reduce vibration. For massive models, you will like the additional handle on the body for more comfortable work. Usually there are variations with only a round handle on top and a rounded body that can be grasped with one hand. They do not have an additional handle. and the possibility of joining it is not provided. The handles have the shape of a clamp, arc or bar.
Of course, additional handles can be partially folded out (for example, when sanding along the edge of a surface), moved to different positions, and also rotated around the body.
smooth starting or maintaining a constant number of revolutions significantly simplifies the work)'. You can easily and simply find the number of revolutions and vibrations taking into account the material. Particularly comfortable are the full-wave electronics, which provide smooth speed control. And the function of setting a low number of revolutions allows you to process heat-sensitive materials.
Before turning on the eccentric grinder, you should carefully study the manufacturer's instructions in detail.
For polishing surfaces, it is better to use a model equipped with control electronics, which allows you to adjust the oscillation frequency. What exists is that during such work the oscillation frequency must become less than during grinding. If the user polishes the surface at “high speed”, the engine, as it is also called, will overheat and the material being processed will be damaged.
It is recommended to sand varnished surfaces at low speed. They are very sensitive to high temperatures; to achieve a rational result, you need to ensure that the temperature does not increase. Experts recommend using clean abrasives in such cases and not even pressing too hard on the grinder, so as not to create additional friction.
For grinding plastics, abrasive wheels with a grit level of 240 and higher are used. When processing metal surfaces, the grain size of the abrasive wheel is preferably two or more than 600.
Is the game worth the candle?
The environment, trips out of town and not always high-quality road surfaces lead to cracks, chips and scratches on the body and bumpers. Exposure to direct sunlight will cause paint to fade, resulting in the need to refinish or repair your vehicle's paintwork.
There are a lot of opinions on polishing and minor repairs, and some believe that polishing a car with an angle grinder can lead to even worse results. This opinion can be called erroneous because the correct and precise approach to work and the choice of the right technology will allow you to get an excellent result.
By choosing the right materials, even the most neglected car can be restored to its original appearance. Initially, you need to determine the scope of work and select the appropriate paste and polish, among which there are several types:
- abrasive and non-abrasive - this applies to paste and polish;
- silicone polishes;
- restorative polishes.
Pastes are marked; for abrasive pastes the designations J3, J6, J7, J10 and M3 are used. Polish pastes are in demand. It is worth remembering that the polishing spray is designed to provide the final look and shine.
When preparing the body, fine sandpaper P 2000 is used. It clogs quickly, so it is necessary to frequently wet the surface with water. This fine sandpaper will get rid of deep scratches and paint chips.
Abrasive polishes are used to remove scuffs and scratches from car paintwork. Treatment with this product removes a slight layer of varnish, after which it will need to be restored. At the next stage of work, protective silicone polish is applied. It fills the smallest cracks, micro-scratches and adds shine.
In order not to perform the entire range of work manually, the car is processed with a grinder. When working, special circles are used. For grinding machines, eccentric ones with high runout speeds are chosen. It is better to purchase a professional tool, for example, from brands such as Makita or Bosch.
Choice
Professional models are designed for long-term continuous work. The quality of materials used for their production, the reliability of components and electronics is much higher,
than that of household grinders. Professional-grade tools are designed for multi-shift work in busy conditions, which is why this list is subject to the highest operational requirements. You, they are more than just in size, but their engine is stronger.
the average consumer is designed to work from case to case. They are designed for deployment over a period of 20 hours per month, typically have the least power and weight, lower performance and fewer additional features. The advantages of household systems are the yen applicable to the home handyman and ease of use.
You should look at the manufacturer’s warranty and the availability of service centers where there is an option to repair the instrument, or it is also called technical preventive maintenance. Be sure to decide on the volume and specificity of the work to be done. If the equipment means working every day, it is better to purchase a professional class model.
Household tools will not cope with overwhelming tasks and will fail ahead of time. However, the warranty will not apply to such a machine (if the service turns out that the tool was used in excess of the manufacturer’s recommended regime). The volume of work performed affects the multifunctional features of the tool.
Popular brands and manufacturers of vibratory sanders
- DeWALT
- Black Decker
- Bosch
- Hitachi
- Makita
- Skil
- Metabo
- AEG
Conclusions:
- Using certain models, of course, grind concrete
- Most systems can handle metal surfaces
- The most necessary work is stripping and polishing wood
- The brand of consumables is the key to durability and performance
- If the diameter of the outlet pipe allows, of course connect it using a vacuum cleaner
- Dust can be discharged into a receptacle that is easy to disassemble and clean
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