Varible Suction Control

Smart sanders, smart choice.

There's something to be said about the difference between a just another sander and one that integrates intelligent electronics. Rotex sanders incorporate Festool's Multiple Material Control (MMC) electronics. MMC Electronics deliver soft-start, step-less variable speed control, constant speed under load, and thermal and overload protection. Each of these functions are designed to provide you with optimal results and protect your power tool investment.

Let's take a moment to look at each of the functions of MMC electronics in more detail.

MMC electronics smart sander

Thermal and overload protection.

What's the easiest way to kill a power tool? Answer: push it beyond its capabilities resulting in a catastrophic failure. Rotex sanders have integrated thermal and overload protection to prevent this from happening. These sanders are smart enough to prevent themselves from being damaged. The motor and other components of the sander are susceptible to failure if pushed beyond their limits. But MMC electronics kicks in before those limits are exceeded to prevent damaging effects. The tool will simply shut off temporarily until it returns to temperatures within its parameters.


Have you ever turned on a power tool and it took off spinning so fast that it jerked in your hand? Well, that doesn't happen with Rotex sanders and other Festool power tools equipped with MMC electronics.

Soft-start means that the motor slowly ramps up to speed when it's turned on. Not only can this help prevent accidental damage to your sanding surface, but it also means less strain on the motor and other components of the sander, resulting in longer service life.

Watch Video of Rotex RO 90 DX

Step-less variable speed control.

Step-less variable speed control is not only an important feature on Rotex sanders, but also on Festool's CT dust extractors.

First, let's consider variable speed dust extraction as it pertains to sanding. To obtain an optimal finish, you want to prevent swirl marks and other sanding imperfections. If you are using a dust extractor that does not employ variable speed technology, the suction force can actually pull the sander down into the material. The results are similar to leaning on the sander rather than allowing the sander do the work. Deep abrasions, swirl marks and other imperfections.

Polishing felt with Rotex

Being able to lower the suction force on Festool's CT dust extractors, you can find that sweet spot where the suction force breaks loose and the sander floats freely on the material while still optimizing dust collection.

Why is variable speed important on a sander? If you are working on a delicate material or with a very fine finish, you may want to lower the speed of the sander to remove material less quickly. Since Rotex sanders are capable of polishing tasks, the speed can also be lower when applying waxes and other compounds.

Constant speed under load.

Lastly, constant speed under load means that the sander accounts for unpredictable changes in the consistency of the sanding material and surface and provides a constant rotational speed. Again, this is designed to provide you with optimal sanding results.

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