Shlify Mastery

Overview of eccentric grinding machines. Principle of operation, use, care. Test results.

The Black Decker KA 220 E car, being affordable, has three important advantages: eccentric, vibration and triangular abrasive form. Easy handling and power complement the capabilities of this model suitable for all types of grinding

The grinding disk can simply be replaced. The possibility of processing curved surfaces depends on the choice of its hardness

Grinding machines with handle for palm are well suited for handling small surfaces. Just do not press the car too much so that there are no deep traces

Dust sunsited into the holes located in a circle in the abrasive and grinding disk, and then falls into the dust collector

For polishing marble, painted surfaces, metal apply a special paste with a foam or felt disk. Give the surface to dry and then complete the polishing disk from sheep wool at low speed to avoid overheating

In order for when installing an abrasive disk, combine its perforations with holes on the grinding disk, there is a small trick. Before installing a disk, bend it with your fingers: so you will quickly find the place of coincidence of the entire two holes, and it will be enough

Regular cleansing from dust will help save the tool in excellent working condition.

These portable electrical instruments have obtained their name due to two varieties of the movement of the grinding circle orbital and rotational. The effectiveness of these machines is due to the combination of their multifunctionality with ease of handling. So, our impressions of the work of ten tested models ...

Eccentric grinding machines, quite widespread among professionals, on the general market appeared only in 1989. The first model was Boschpex115. By taking a competing position in relation to tape, rotating or vibrating grinding machines, they quickly attracted attention to the range of their capabilities. These tools are suitable for both black and polishing both smooth and convex, and even concave surfaces.

Operating principle

There are two types of eccentric grinding machines. The first harder for palm-lung, small size, allow you to grind the most hard-to-reach places. The second sessional handle is particularly effective when processing large surfaces, the grinding disk is connected using a ball bearing with another disk attached at the end of the drive shaft and performing a turbine function with a suction action. A pendulum movement moves from the motor to the grinding disk, while the centrifugal force provides a rotational movement. Their alignment makes the abrasive circle move along the ellipse path, thus constantly shifting traffic. The quantitative ratio of rotational and eccentric movements depends on the force of pressure to the tool; And the productivity is from the magnitude of the grain of the abrasive and the amplitude of the eccentric movement.

The built-in turbine sucks dust into a special dust collector through the holes in the abrasive and the corresponding holes in the grinding disk. The dust collector is a rigid plastic cassette or paper or tissue bag. It is also possible to external absorption, for which a synchronously enabled vacuum cleaner can be used (model Synchro30A AquaVAC company). The absorption of dust allows you to avoid clogging and heating the surface being processed, and also extends the service life of the abrasive and leaves the visible grinding area.

The mounting of the abrasive on the grinding disk "Velcro" allows you to quickly and simply remove it or change it, it does not allow it to shift and protects against the rupture.

All the modes tested by us (with the exception of Makita) are equipped with a brake system that does not allow a grinding disk with an abrasive rotation to rotate. It can be a simple rubber casing, ABC brake (both on the BlackDecker model), or an electronic controller (NETABO). The goal of all these devices alone unwanted defects and scratches on the surface being processed.

Using

When rubbed surfaces with wax, you need to keep the car in your hands hard, so that it turns out an uniform and thin layer. The sponge, which is reinforced on the disk of the sanding machine eccentric, evenly distributes along the surface of the wax layer and at the same time the friction creates a heat that promotes the penetration of wax to the tree eccentric grinding machines is suitable for all types of grinding works, both rough and finishing. The speed and magnitude of the abrasive grain should vary depending on the polished material. Speed ​​on all tested models (again, with the exception of Makita) varies with an electronic regulator. Ana model Peugeot about this signs LEDs.

Small speeds are necessary for coarse processing and grinding of painted surfaces, and high-for solid wood and finishing works. Before starting work, try to process a test sample of a suitable material. Before turning on the machine, attach it to the treated surface: then it will start working smoothly, and will not turn on immediately to the full power.

With the rough cutting of the item should not be too pressing on the car, you just need to behave. Then the disk rotates freely and removes the sufficient layer. On the contrary, if you press the tool, the rotation of the abrasive disk slows down, and the weakened oscillatory movements favors more thin and uniform finishes.

Move the grinding machine is better than two hands, slowly and smoothly. We must try not to tilt it and not grind the surface away from ourselves. Move the car, as you comfortably (in front of the back, circles, cruciform); The grinding disk moves to any side, therefore it is not necessary to move it in the direction of wood fibers.

So that irregularities appear on the treated surface, each time it is better to go several times, and not try to process it immediately. You should be neat so as not to run too much the edges of the surface. For challenging work, use the external stop, located above the vertical axis machine. This will give the tool better equilibrium.

There are three degrees of stiffness of the grinding disk. The most soft allows you to process the surfaces on which it is important to keep all the bends. To remove it, it is enough to unscrew only one screw. The models of AEG, Dewalt, Kress, Peugeot and Ryobi have three screws, in our opinion, completely unnecessary. In addition to conventional abrasives representing the entire range of grain, you can mark the tempered steel Sandplate (Sandvik). After special treatment in acid, thousands of small pointed points appear on them. They remove the layer from the treated surface in 12 times faster than the usual abrasive and do not clog.

Care

The dust collector must be shaken as soon as it is filled with approximately a third. Aperdes how to handle the metal, be sure to fully shake the bag: its contents can catch fire from the spark. These grinding machines are well protected from dust and do not require special care. From time to time it is necessary to simply clean the holes for suction of the dust and the surface of the grinding disk with compressed air. Never lubricate holes with oil, otherwise the damasted dust particles will have a detrimental effect on the operation of the machine.

Our conclusion

For thin and delicate work, preference should be given to machines with a handle for palm. First of all, this is a dewalt-light model, compact, which made all technical innovations of its time and is very convenient in work. Makita is also easy and compact, but it lacks an electronic regulator of the speed of rotation of the disk, although it is quite powerful and reliable. From models with a classic handle with its qualities, the Metabo is allocated for its multifunctionality and peugeot for its black surface treatment. Bosch, BlackDecker and Skil offer machines suitable for any work, and at a reasonable price. Very good model AEG, however, the price is discarded a bit. Kress and Ryobi - two cars with the lowest level of all given; Their difference is only that the first model is packed in a suitcase, and the second is not.

Model	Power	Frequency of oscillations (first.)	An amplitude of electric stroke	Electronic regulator	Dust collector	Weight	Length of cord	pros	Minuses
AEG EXE450.	330 W.	7500-10000	7 mm	there is	Fabric bag + adapter for external vacuum cleaner	2.3 kg	2.45 M.	The ability to attach an abrasive plate with a diameter of 150mm; Comfortable top emphasis	Pretty heavy machine; Located on the side of the angle of 70, the device of the outer absorption of dust is not very convenient; Fastening the abrasive disk with three screws.
BlackDecker KA190 E.	330 W.	7500-10000	5mm.	there is	Fabric bag + adapter for external vacuum cleaner	1.8kg	3.20m.	Easily installing in different positions of the handle; the possibility of external suction instead of the initial dust collector; Comfortable top emphasis	Fixing button of the gay in the "On" position unusually located in the front of the handle, which is quite uncomfortable
Bosch Pex12ae.	400 W.	4500-13000	5 mm	there is	Paper bag	1,9kg	2.50 M.	Powerful absorption; comfortable top stop; The height-adjustable handle, which can be pressed to the body of the machine in difficult work; comfortably hold in hand	Adapted for external absorption of dust, for which there is a connecting tube - this makes the burdensive replacement of paper bags
Dewalt DW423.	250 W.	7500-12000	1.3 mm	there is	Plastic cassette	1,45kg	4 M.	Most convenient in work from all the presented models; Dust collector casing oriented 360; Very good dust drawing; START-STOP button; Long cord	The possibility of external absorption of dust; Fastening the abrasive plate with three screws.
Kress Hexe125	250 W.	0-11000	5mm.	there is	Fabric bag	1.7 kg	1.90 M.	The machine with accessories is sold in a plastic suitcase, which ensures safety from damage during transportation; A suction casing is equipped with a brush.	Mediocre dust drawing; Fastening the abrasive disk with three screws.
Makita ABO5000	180 W.	10000.	5mm.	not	not included	1,3KG	2.6 M.	The easiest and most compact machine from all presented; START-STOP button; Outdoor dust absorption through a thin flexible tube	Professional machine, requiring work skill; only outdoor absorption of dust; Non-incoming casing and hex key for changing grinding disks
Metabo Sxe125	220 W.	5000-12000	5mm.	there is	Paper bag + adapter for vacuum cleaner	2kg	1.91 M.	Vario-Consomatic system supporting constant speed; very comfortable top stop; quickly regulated in both sides of the handle; ring-shaped brush; Metal suitcase; professional machine, not too high the price of which makes the purchase of justified	Not too convenient location of the dust collector
PEUGEOT PRX150 E.	710 W.	0-12000	3mm	there is	not included	2,2kg	1.88 M.	Two types of movement: eccentric or rotational; indication of the speed of LEDs; Electronic speed controller	Pretty heavy and bulky car, only outdoor dust suction
Ryobi RS125	250 W.	0-12000	5mm.	there is	Fabric bag	1.7 kg	1.91 M.	Additional handle; Easy machine with good equilibrium, equipped with a casing with a bristle	An additional handle is not regulated; not too comfortable fabric bag; Fastening the abrasive plate with three screws; Insufficiently convenient dust suction device
Skil 7435H1.	310 W.	7000-12000	2,5mm.	there is	Fabric bag + adapter for vacuum cleaner	1.8kg	2.60 M.	The handle, like Bosch, running along the machine body, is convenient for some works; the possibility of transition to the initial outer absorption of dust; Recess for hexagon key on the case; Low price	Not enough convenient location of the upper stop