Eccentric sanders are suitable for quick and perfect sanding. The removal rate is significantly higher than with an orbital sander, because in addition to the lifting movement, there is also a rotary movement of the sanding disc. While most DIY models come with a 125 sanding pad, many professional machines have grinding discs with them 150 mm diameter. This allows you to finish faster when sanding large areas.
A sanding disc brake ensures this, that the sanding disc does not rev up too high when idling and then eats holes in the surface when it is placed on the workpiece. The switchable forced rotation of some professional machines, on the other hand, should always ensure sufficient rotation of the sanding disc and thus high stock removal, even when there is strong pressure on the machine.
There are two designs for random orbital sanders. In the machines presented here, the sanding disc is driven directly by the motor above it. This enables a compact design and integrated dust extraction. The alternative are devices in angular construction. They resemble an angle grinder. The sanding disc is also driven here via an angular gear. There is no self-extraction. A vacuum cleaner must always be connected.
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■ For sanding wood- and painted surfaces are sufficient for devices without electronics. But do you also want to grind heat-sensitive plastics or polish your car?, you need a machine, where the speed can be changed electronically.
■ Soft to medium-hard sanding discs are also suitable for sanding the inside- and outside curves. There are sanding pads of different hardnesses for many devices in the manufacturer's range of accessories.
■ The compact devices with 125 mm sanding discs are ideal for smaller sanding jobs. If you mainly want to sand larger areas, take a machine with a 150 plate.
■ An adjustable or removable additional handle makes it easier to sand along edges.