How to choose a grinder? Overview of all types: eccentric, vibratory, belt and others
Wood sanding is difficult to call a pleasant procedure. Tiring monotonous movements, dust, constant control of the processed surface. all this does not add to the fascination of the process, especially when it comes to large amounts of work. Grinders greatly simplify life in this matter.
Each type of grinder is designed for specific tasks: where one will show unsurpassed results, the other will be helpless. For example, eccentric grinders will not cope with the processing of inner corners, in contrast to their less advanced counterparts. vibrating models. In this article we describe the main types of sanding machines. Explain the principle of their work, the scope of application and other nuances that will help determine what kind of grinder to buy for specific carpentry needs.
Immediately say that such options grinders, such as abrasive attachments on the drill, screwdriver or angle grinder (angle grinder), we have left out of the brackets of our conversation. They are suitable for rough sanding surfaces, but will never produce a normal result when sanding wood surfaces accurately.
Sanding wood is a responsibility
How to choose a wood sander. tips
Sanding wood is a time-consuming process that can be made much easier by using the right tools. For woodworking, belt sanders, oscillating or eccentric sanders, as well as delta sanders are best suited.
The right choice of device depends on the type of work performed and the characteristics of workpieces: shape, size, sanding corners and hard-to-reach areas, type of coating, etc. д.
Different tools are better suited for individual jobs, viz:
- Belt sander is better chosen for sanding large and flat surfaces;
- the eccentric sander makes it convenient to work convex and concave small wooden surfaces;
- oscillation model has a similar application, with the possibility of processing corners thanks to the rectangular soleplate;
- the delta sander is ideal for work on surfaces with complex shapes that are inaccessible to most sanders, while the small area of its soleplate is usually recommended for small wooden surfaces.
Which models are available??
designed to be used in combination with various materials. For woodworking, choose models with the largest platform size and a huge stroke reserve. They allow you to successfully treat even the corners of floors and walls. Mini versions are comfortable when used in inaccessible places, have a small platform and low power. For work on metal SSM used in machine shops, as well as in the manufacture of doors, fence constructions.
With the equipment you can remove old paint, remove scratches, corrosion and oxidation. Triangular or delta-like foot is indispensable for the restoration of old furniture and furnishings. With its help it is comfortable to peel off the paint window frames and doorframes. Models with optional accessories can work with a round nozzle, substitute for eccentric counterparts.
Selection criteria grinder
Now let’s move on to the question. what grinder to choose. Everything will depend on what you want to do. As practice shows, craftsmen always buy two varieties: for rough cleaning and finishing. Therefore, the best option. a pair in the form of an eccentric and a belt machine. If the task is to sand furniture objects, then you can not do without the oscillating tool here.
If there is no desire to work with the tape version, then you can recommend two eccentric with different size of the eccentric itself. Fortunately, manufacturers offer several variants. For example, if the eccentric is 6-8 mm, then such a tool is used for roughing. If the parameter is 2-4 mm, then it is used for finishing. True, it should be noted that a good eccentric sander is not cheap.
If the budget does not allow you to buy an expensive and high-quality tool, buy an angle machine. But to it you will have to buy either an orbital, or vibratory. The second one is cheaper than the first one, but less productive. In addition, the latter is considered a universal tool in terms of grinding wood.
Keeping the above features in mind, let’s look at specific models that have the most positive reviews and are liked by our experts for their features. Let’s start with the professional products with 900-1200 Watt, which are designed for intensive use.
First place, the experts gave the “Makita 9404”, which is endowed with power of 1010 watts and can rotate the grinding belt at a speed of 440 m / min. The size of the equipment is 610×100 mm, so that a large area is covered at once. The power tool is held by two handles. On the back there is a nozzle and a waste collector. On the right side there is a wheel to adjust the speed. The start button can be locked so that you don’t have to keep the trigger pressed all the time. After a belt change, the belt position is adjusted automatically. Feedback from owners is that the machine can be turned over, placed on a table or the floor, turned on, and used as a machine, processing small parts, holding them in their hands.
We have found the belt sander to be the best in terms of endurance during intensive use. Numerous testimonials confirm that the machine has been in use 5 days a week for 4-5 years by repairmen or carpenters. Thus owners change only consumables in the form of a tape, brushes and a carbon sole.
- high power of 1010 W;
- the belt runs at a speed of 440 m/min;
- there is a speed control;
- immediately captures 100 mm in width.
- from the weight of 4.7 kg faster arm fatigue;
- Sometimes the bag slips off;
- It is difficult to buy a belt smaller than 180
- The back handle has no anti-slip pads.
Metabo BAE 75
In second place is a professional sander BAE 75 from “Metabo”. Electric tool is endowed with power 1010 W, as well as the leader of the review, but it has already rubberized handles, so it is much more comfortable to hold. The belt speed of 450 m/min is slightly better than the competitor, but the tooling size is smaller here. 533×75 mm. One blade with 80 grit is already included in the package. The machine has a dust canister with the company logo, as well as an adapter for connecting a vacuum cleaner. The manufacturer has taken care of a little detail in the form of an allen key, so that owners can easily replace the sanding belt. The machine weighs 4.7 kg. Smooth start-up ensures a precise start without jerk effect.
Our experts and other users in the reviews liked the presence of a special bed to this sander, which not only allows you to use the tool upside down, but also ensures the grinding of workpieces at the desired angle. The position of the stop can be changed and is secured with a screw on the left.
The third place is taken by the grinder from INGCO with 1200 Watt. The device is equipped with a belt with 610×100 mm dimensions. On the right side there is a connection for a dust bag or vacuum cleaner. Two rubberized handles make it easy to hold. The start button can be fixed with a small button, which is practical for long works. Feedback from owners shows that the machine does not get hot when sanding for long periods of time. It also works well with hardwoods (hornbeam, oak, ash). All of its major components are made of metal and assembled without backlash. Consumables, including brushes, are easy to replace thanks to open-access fasteners.
We have found this sander to be the best in terms of power that does not droop under load. 1200 watts allows for belt speed up to 500 m/min. All this contributes to the increased productivity, so the machine is suitable for sanding large volumes of wood (steps, walls, floors, etc.). д.).
- Protected outlet of the power cord against deflection;
- dust bag and adapter for vacuum cleaner;
- lockable power button;
- rubberized handles.
Bosch GBS 75 AE
In its blue tool range, Bosch produces the GBS 75 AE belt sander with 750 watts of power. Despite the relatively low power, it can develop speed up to 330 m / min, which can only compete with models with an indicator of 1000 watts, so the product is placed in the category of professional. RPMs can be adjusted for different wood densities. Belt dimensions are 533×75 mm. All knots for grinding belt rotation are made of metal, which extends their service life. The model weighs 3.4 kg. Judging by the reviews of the owners, it is enough to work in the horizontal position without additional pressure from the operator. The set comes with a parallel and angular stop, as well as the frame, which expands the capabilities of the grinding power tool.
We considered the best sander because of the design of the dust bag. The bag is put on the spigot and fixed on the additional bracket with a This ensures that the shape is always spread out and more dust enters the tank.
- the rotation speed is adjustable;
- The front roller and the whole bottom part is made of metal;
- well thought-out ergonomics;
- Parallel and angular stop.
This machine is indispensable for cabinetmaking, window production, floorboard, blockhouse or softwood linings. The belt sander has a power rating of 940 W and reaches a feed speed of up to 380 m/min. Belt size 610×100 mm facilitates rapid processing of large areas. The dimensions of the machine itself is 354x175x168 mm, so it is not difficult to transport it with you to the place of work. Customer feedback shows that the grinding tool is comfortable to hold thanks to the handles covered with rubber pads. The dust canister is equipped with a plastic lifting bar that allows to quickly open the bag for cleaning. To use the machine upside down, you will need to attach a special trapezoidal plate.
Grinders are produced by almost all companies involved in the production of electric hand tools, both in our country and in other technically advanced countries of the world. The most popular among users are the following brands:
World-famous Japanese company specializing in the manufacture of hand-held electric tools.
German brand “Bosch” is known for its reliability in all areas where the company operates.
Domestic manufacturer, successfully competes with famous foreign brands.
Well-known manufacturer of professional tools from USA.
Designation and principle of operation of belt grinders
LShM is widely used not only in industrial production, machine shops, carpenter’s workshops, but also in home workshops.
The drive motor transmits torque to the drive roller, from which the abrasive ring belt is set in motion. The sanding depth and surface roughness depends on the abrasive particle size in the sandpaper. The finer the fraction, the less rough the machined surface will be.
Eccentric grinders (orbital)
The centric grinding machine (CMP) works on the principle of combining vibration and rotation. It can be said that one machine combines the vibratory and disc grinders. The result of this combination is excellent surface quality combined with high productivity. Working platform of CMP is a round disc (“plate”).
Excentric grinders are considered universal. They are suitable for rough sanding (scraping) as well as for fine polishing of large workpieces.
The thickness of the removed wood layer can be adjusted by pressing the platform harder or weaker. The performance can also be adjusted by changing the diameter of the vibration circuit (eccentric stroke). The smaller the size, the lower the performance, but the better the finish. And vice versa. Therefore, for the primary grinding machine set a large circle vibration, and for the final (polishing). small.
Modern ESHMs have a motor power output of 200 Watts to 900 Watts. powerful models are also more productive. They are able to work with larger soles, with a diameter up to 150 mm.
The rotational motion of the grinder with adjustment can be performed at speeds of 4000-14000 rpm. If there is no adjustment, then this figure is reduced to 12000 rpm. The speed of the oscillating movement is only about half. The higher the speed of the machine, the coarser the sanding can be, but the higher the performance.
The size of the sanding pad is also very important. The most popular grinders have a diameter of “plate” 115 mm, 125 mm and 150 mm. Usually already in the name of the tool there is a number indicating the size of the sole. Large “plates” are designed for processing large flat areas, so they are equipped with machines with high power and productivity. A machine with a small platter will take longer to sand, but can accurately work in narrow and hard-to-reach places.
A video review, where several grinders from different manufacturers were tested “for professional suitability”, can help in the choice: