Eccentric and Orbital Sanders

Criteria for choosing an orbital (eccentric) sander

Each eccentric orbital sander is designed to work under specific conditions, has specific processing characteristics and can only withstand the cyclic loads specified by the manufacturer. Therefore, in order to choose the right grinder for yourself, you must be guided by the following criteria:

1. Rotational speed and vibration amplitude. For cleaning and coarse grinding, rotation speeds of 10,000 rpm or more are used. with a large vibration amplitude. This increases productivity, but affects the surface quality. Fine grinding is performed at speeds of 2000 ÷ 4000 rpm, while it is desirable to have a smaller eccentric amplitude. As a universal, you can use an eccentric sander with speed control and an amplitude of 2-3 mm.
2. Performance. This parameter depends entirely on the size of the sole and the selected processing modes. The larger the abrasive area and the rotation speed, the higher the productivity. In entry-level eccentric sanders, grinding wheels with a diameter of 125 mm are used, and the diameters of wheels for professional general purpose grinders are usually 150 mm.
3. Duty cycle and production load. The ability of a grinder to perform work in a long cycle without interruption and to operate full work shifts for many months depends on the components and materials used in its manufacture. This is the main difference between household and professional power tools. For this reason, the latter can be several times more expensive than its amateur counterpart, which has similar power and engine speed.
4. Operating conditions. If it is intended to carry out grinding work in special conditions (high humidity, fire hazard, high dust content, etc.), the choice of a suitable eccentric sander requires special attention. Manufacturers produce power tools with increased security and indicate the parameters of its operation in the passports. One of the options for such cases is the eccentric air grinder, which has no electrical parts and can work in almost any conditions.

Additional criteria include ergonomics, vibration and noise levels, and the cost and availability of consumables. Information about all this can only be gleaned from user reviews or on the appropriate forums.

Specifications

The defining operating parameters of belt sanders include their power, rotational speed and width of the abrasive, as well as the mass of the device.

Power is one of the most important technical characteristics and directly affects a number of operational capabilities of the device. The power depends on the engine speed, energy consumption, weight of the unit and the time of its continuous operation. Modern machines have a power from 500 W to 1.7 kW. The lowest power is possessed by a mini-device Makita 9032, for its modest size it is called an electric file. The model is equipped with a very narrow belt and is able to work effectively in hard-to-reach places. Most household appliances are produced with motors from 0.8 to 1 kW, while for intensive work it is better to use 1.2 kW models. Professional stationary machines have a power of 1.7 kW or more and are characterized by high energy consumption.

For working with small parts, as well as a tool for beginners, a device with a speed of 200 to 360 m / min is suitable.Such a machine will not remove more material than is required and will grind more slowly and evenly.

• Machine weight is also an important factor in the usability of the unit and the quality of the sanding. Weight characteristics are especially important when performing vertical processing of doors, window frames and slopes, when the device has to be held for a long time. The mass of the unit directly depends on the engine power, and the more powerful the motor is installed on the LSHM, the heavier the product. So, medium-sized household models usually weigh in the range of 2.7-4 kg, while the weight of serious professional samples often reaches 7 kg. When working with heavy equipment, you must be extremely careful: when starting, the machine standing on a horizontal surface can jerk suddenly from the hands and injure the operator. In this regard, the unit must first be started up, and only then put on a working base.
• The width of the belt is interrelated with the power of the motor and the rotation speed: the wider the width of the abrasive, the higher the power and the lower the speed, and vice versa. The most common tapes are 45.7 and 53.2 cm long and 7.7, 10 and 11.5 cm wide.The length multiplicity step is 0.5 cm.However, there are also models with non-standard lengths, which causes certain difficulties when choosing consumables materials.

The device and principle of operation of a belt sander

To begin with, it is worth talking about the design features of the heroine of our review. Externally, the grinder is a rectangular body, in the lower part of which there are two movable shafts. A tape with abrasive material is attached to these rollers.

The most "sophisticated" models are equipped with a bag for collecting sawdust, dust and other debris generated during the grinding process

In the process of operation, the shafts begin to rotate at a certain speed - this leads to the movement of the belt, removing all irregularities to a perfectly smooth state.

The owner only needs to slowly, with a certain degree of pressure, slide over the material being processed

The procedure is quite simple and does not require special knowledge from the operator. The presence of linear grinding helps the most (eccentric or vibration machines do not have this feature). You can move the equipment in any direction with almost identical results.

How to choose?

When choosing a multifunction grinder, there are a number of important considerations to consider. Usually, the choice of tool is carried out based on the specific type of work that they have to perform. But this grinder is therefore called "multifunctional", because due to the presence of various attachments, it can perform a wide range of construction and household work. Therefore, such a tool is universal and highly demanded.

When choosing a tool, you need to pay attention to some indicators

• Nutrition. Standard models of grinders work from the mains, that is, from a regular outlet. But access to electricity during construction can be difficult - in this case, you should opt for battery models of the grinder. These models have a power supply that is charged from the mains, so the tool can be used in a power outage.
• Power. For a standard grinder, a power of 200 to 350 W is sufficient. For this tool, the speed of revolutions does not play a big role. But if a very thorough cleaning of the surface from a large amount of rust or paint is required, then a high power tool will not interfere.

Soft start function. Today, many manufacturers supply their instruments with this function. This makes the sander more comfortable and safer, as even high RPM tools will pick up speed gradually.

Together with this function, a speed stabilizer is usually installed - a useful quality that you should pay attention to when choosing a machine. In this case, you can independently adjust the speed of rotation of the tool depending on the type of work or the material to be processed.

Convenience

The key to high-quality and safe work is the ease of use of the tool. When choosing a multifunction sander, you need to make sure that the tool fits well in your hand. The weight of the device is also an important aspect. It is difficult to work with a heavy and oversized tool for a long time, and even more so to carry out tasks on weight.

Brand. There are a large number of different manufacturers of multifunctional grinders on the market today. But not all manufacturers were able to recommend themselves positively. Below is an overview of the best models of grinders, their main pros and cons are considered, and most importantly, the rating was compiled on the basis of feedback from real buyers who noted the pros and cons of various models.

How to choose a tool

When choosing a grinder, you should pay attention to several important parameters. Here are the main ones:

Here are the main ones:

Power. The more powerful the electric motor of the device, the more efficiently it works and the more loads it can withstand

However, it is important to remember that a powerful motor leads to a large consumption of electrical energy, and in the case of rechargeable devices, it quickly discharges the battery. Therefore, it is best to give preference to a model with an average power.

It will be quite enough for full-fledged work, and it will not consume much energy.

Rotational speed. Directly depends on the power of the electric motor (although there are exceptions). The faster the moving parts of the device rotate, the more surface it processes per unit of time and the greater the productivity.

Width of the tape. On sale you can find machines with a very different width of the working surface - from 2-3 to 15-20 cm. The first ones are suitable for processing workpieces firmly fixed on a workbench or in a vice. The second is for working with large surfaces (for example, sanding parquet or wood wall covering). Also, devices with a large belt width are easier to turn into stationary ones - when they are fixed, a large working surface area provides maximum comfort during the operation of the equipment.

The length of the tape. Typically, the abrasive belt of grinders has a length of 40 to 60 cm (depending on the model of the tool). The shorter the length, the higher the rotation speed and the higher the productivity. However, it must be remembered that short belts wear out faster and require more frequent replacement.

The weight. Everything is simple here - the lighter the power tool, the more convenient it is to work with it. However, the lightest devices usually have a rather weak motor - after all, the bulk of the mass falls on it and depends primarily on the amount of winding.

Reviews of real owners. Often, tool manufacturers do not indicate in official sources the shortcomings of their products, the nuances of its use, problems arising during operation. This is understandable - they need to sell as many of their products as possible. Therefore, in order to form an objective opinion about the grinder, it is worth reading the reviews of those who already have one, as well as studying the reviews and reviews of independent experts on the chosen tool.

Usually the most reliable and durable grinders are from trusted brands. However, decent options can also be found among Chinese power tools. True, in this case it is very easy to run into a "pig in a poke" - the quality of the "Chinese" products can differ greatly even within the same batch. Therefore, it is better not to risk it and buy a grinder from a trusted company that has proven itself well.

FAQ

Safety rules when working with a wood sander

When working with an electric hand tool, it is necessary to follow the safety rules that are reflected in the Operating Instructions for a particular model, as well as the following recommendations:

• Only a tool that is in good condition may be used.
• When working with a grinding machine, you must use personal protective equipment (overalls, gloves).
• When performing work, you should:
• the machine should be moved evenly along the workpiece;
• do not overheat the tool, because this can lead to its breakdown;
• additional forces (clamping, pressure on the handles) will not improve the quality of processing, but can lead to overheating and failure.
• If possible, connect the tool to a vacuum cleaner or install a dust collector, this must be done.
• After completing the work, it is necessary to clean the grinding machine from dust and put it in storage.

What kind of sandpaper is needed for sanding machines

In grinding machines, sandpaper is used of various types, technical characteristics and forms of release. By the form of release, sandpaper is classified as follows:

• tape - used in belt-type models, as well as scraper equipment;
• circle - used on "grinders", on the reverse side there is a layer of "Velcro", which makes it easier to use;
• triangles and rectangles - used on vibration-type machines;
• roll and sheet - used for various purposes, if necessary, cut to the required dimensions (platform or platform size).

By the type of base used for manufacturing, sandpaper is classified:

• paper-based - cellulose is used without chemical additives;
• on a fabric basis - it is more durable than paper counterparts;
• on a combined basis - cellulose and fabric are used in the manufacture, which reduces the cost and at the same time increases the strength indicators;
• with the use of Velcro - used in the manufacture of quickly wearing discs used with "grinders" and vibration-type machines.

The following abrasive materials are used: ceramic chips and silicon carbide, electrocorundum and garnet, as well as aluminum oxide. The marking of sandpaper, depending on the grit of the abrasive and the type of use, is as follows:

cop. In the group of grinding machines, the most popular models are:

In addition, abrasive mesh and abrasive wheels are used for grinding, as well as various types of grinding discs for wood, made on the basis of the above abrasive materials.

The best angle grinders with a disc diameter of 230 mm

For a cutting depth of up to 70 mm, angle grinders are used with a disc diameter of 230 mm. These heavy models are rarely used at home, the area of ​​application is cutting thick-walled metal and metal products, paving slabs, curbs, concrete processing. To accomplish these tasks, the power has been increased, there are systems for protecting the tool from overloads, a smooth running mode, and an adjustment of the number of revolutions.

Makita 9069

The Makita 9069 angle grinder has a power of 2000 W, the maximum number of revolutions is 6600. The weight of the model is 4.2 kg, with dimensions of 528 * 189 * 177 mm. This is a simple and reliable angle grinder with a minimum set of functions. There is a locking start switch, multi-stage protection against dust ingress.

+ Pros of Makita 9069

1. Comfortable grip, hands don't slip.
2. There are three holes for attaching the second handle.
3. Armor and winding armoring.
4. Elastic power supply wire, does not interfere with work.
5. Powerful enough for cutting thick-walled metal and stone.

- Cons of Makita 9069

1. No soft start, you need to hold the tool firmly.
2. There is no protection against jamming.
3. At the point of contact of the brushes with the body, heating occurs.
4. The plastic of the case has an unpleasant odor that disappears over time.

Output. This sander is designed for professionals. It is used for all types of work, but when cutting metal, you need to monitor the load. The tool is not suitable for sanding wood pieces.

Bosch GWS 20-230 H Professional

The Bosch grinder GWS 20-230 H Professional 0.601.850.107 is designed for significant loads, the power of the tool is 2000 W at 6600 rpm. Dimensions are 550 * 170 * 150, weight - 5.1 kg. Easily processes metal products, for concrete and stone you need to connect a dust extractor, since there is no protection against dust during long-term operation.

+ Pros of Bosch GWS 20-230 H Professional

1. Start without jerking, although there is no smooth start.
2. Large power reserve.
3. Ergonomic grip, hands do not get tired after long-term use.
4. The set includes 8 discs.

- Cons Bosch GWS 20-230 H Professional

1. The flange of the gearbox is not metal, it may not withstand the load.
2. There is no smooth power regulation.

Output. Requirements for the operation of this model - the installation of only high-quality disks. Otherwise, beating may occur, there will be an uneven cut. Scope - industrial metal cutting, processing of concrete, brick, paving slabs. A handy tool for dismantling, construction and repair of private and commercial facilities. Has a great resource.

DeWALT DWE 490

DeWALT DWE 490 angle grinder belongs to the class of professional tools. Its power is 2000 W, the number of revolutions is 6600. Dimensions - 490 * 151 mm with a weight of 5.2 kg. The body is made of high quality plastic, it can withstand short-term mechanical stress.

+ Pros of DeWALT DWE 490

1. Comfortable grip, weight is well distributed between the grip points.
2. Rubberized power cord, does not tan in the cold.
3. The case does not heat up under prolonged loads.
4. Quick-detachable protective cover.
5. Bright color, visible from afar, which is convenient when performing a complex of works.
6. The discs are being finalized up to 20% of the original diameter.

- Cons of DeWALT DWE 490

1. There is no smooth start, jerks are possible at the start.
2. There is no speed control.
3. Spare rubber pads are needed for the handle.

Output. This grinder can be used for mass metalworking, forming large-scale strobes, cutting stone, concrete. Installation of a dust extraction unit is recommended.

Tape

Model Description

If the surface is large, relatively flat, it is better choose belt sander a typewriter. It is designed to handle:

• solid wood,
• varnished boards,
• veneered panels.

Belt sanders are characterized by the highest efficiency, used in workshops, rarely for household work.

Due to their high productivity, belt grinders can process large areas in a short amount of time with excellent results. The treated surface is smooth and homogeneous. Since belt sanders are primarily used for linear motion, they are ideal for sanding along wood grain.

The disadvantage of belt sanders is the design of the base, which does not allow reaching hard-to-reach corners. The edge of the belt is not the edge of the sole at the same time, so surfaces such as near a wall are inaccessible to a belt sander. In this case, a deltoid model is needed.

Video - tape machine Bosch PBS 75A

Which tape model should I choose?

To choose the right belt sander, you should pay attention to the following parameters:

• The speed of movement of the working part - the higher the speed, the faster and more precisely the surface is polished.Depending on the model, the speed can vary from 200 to 420 rpm.
• The size of the belt affects the speed and precision of grinding. The larger the size, the faster the grinding occurs, but the accuracy decreases.
• Power - The higher the power, the better the tool can handle hard, difficult surfaces (hard hardwood - oak). Thanks to the high power, the tool can work longer without overheating.

Power selection

• draw frames with engine power up to 1000 W are designed for light work,
• models with motor power over 1400 W perform well under short-term but heavy loads.

Model overview

Below is a rating of tape machine models recommended by experts. Distinctive characteristics are highlighted for each model.

1. Graphite 59G394. Small front roller diameter (16mm) and optional tilt-angle handle make sanding easy in tight spaces.
2. The Makita 9920 is a powerful, professional draw frame with electronic speed control for optimum performance. Thanks to the automatic lateral adjustment of the belt, the surface can be sanded to the very edge.

Rating of the best models

Below are several models of grinders that are distinguished by decent quality and high reliability.

Bort BBS-801N

The Bort BBS-801N is an inexpensive but good belt sander.

Here are its main technical characteristics:

• Electric motor power 800 W.
• Rotation speed 260 meters per minute.
• Abrasive width 7 cm.
• The length of the tape is 45.7 cm.

• Total weight 3.1 kg.
• The length of the power cord is 3 m.
• Powered by a household electrical network with a voltage of 220 V.

Smooth adjustment of rotation speed is possible. For this, there is a special handle on the body.

Package Included:

• 1 tape.
• 1 dust container.

The device has two handles, which makes it quite convenient to work with. Each of them is made of a polymer composition that prevents the palms from sliding.

The weak point of the Bort BBS-801N is that the cord is not long enough. Its length is only 3 m, and this is not enough when processing large areas. However, the problem can be easily fixed by using an extension cord or by extending the cord with an additional piece of cable.

The average cost of a model in Russian stores ranges from 3,000 to 4,000 rubles.

BOSCH PBS 75 A

BOSCH PBS 75 A is a professional grinder from a well-known electronics manufacturer from Germany. Despite its "brand name", it is quite inexpensive - from 5,000 to 6,000 rubles.

Here are the main technical characteristics of this model:

• Electric motor power 710 W.
• Rotation speed 350 meters per minute.
• Abrasive width 7.5 cm.
• The length of the tape is 533 cm.

• Total weight 3.4 kg.
• Power cord length 4 m.
• Powered by a household electrical network with a voltage of 220 V.

Another advantage of the model is a long four-meter cord, which makes the movement of the person working with the tool much more free.

BOSCH PBS 75 A, in spite of the low power of the electric motor, is capable of reaching a high speed of rotation of the working surface, which significantly increases the efficiency of the use of the tool.

This model also has an automatic dust collector. Safety measures have also been thought out - the power supply button can be blocked if they do not work with the power tool for some time. This allows you to exclude the spontaneous start of the technique due to accidental clicks.

Package Included:

Makita 9910

Makita 9910 is a belt sander from a well-known Japanese manufacturer of power tools.

Here are its main technical characteristics:

• Electric motor power 650 W.
• Rotation speed 270 meters per minute.
• Abrasive width 7.6 cm.
• The length of the tape is 45.7 cm.

• Total weight 2.7 kg.
• Power cord length 3.5 m.
• Powered by a household electrical network with a voltage of 220 V.

The dust collector is made of cloth material. This makes it very easy to empty and wash.

The model is very light and has comfortable ergonomic handles with a coating that prevents the palms from sliding. This makes working with the Makita 9910 very comfortable. The front handle is a hand rest that allows you to achieve the maximum possible pressure on the work surface.

The cord is of medium length. Nevertheless, it allows you to solve most of the tasks that arise in the course of work and almost does not hinder movement.

Package Included:

In Russian retail Makita 9910 costs from 6,000 to 7,000 rubles.