The Rotex dual mode sander has a gear-driven rotary motion and a random orbital motion; both motions have their advantages. The gear-driven rotary motion is appropriate for aggressive material removal and polishing, the random orbital motion is designed for fine sanding.
Gear-Driven Rotary Orbital Motion
The rotary motion uses a geared mechanism to spin the pad, in combination with an orbital motion. The combination of these two motions removes material at almost three time the rate of a normal eccentric sander.
With this pattern, the sanding action is almost as aggressive as a belt sander or a grinder. The Rotex creates a random scratch pattern that virtually erases itself during sanding unlike a belt sander or grinder, which leave deep linear or circular scratches that are hard to sand out with the next grit up. The result is a sanded surface that is far superior to what you can achieve with a belt sander or a grinder using the same grit.
Bottom-line: Sanding with the Rotex in rotary orbital motion saves a lot of time since material is removed in an aggressive, yet smart way, providing the best surface during each sanding step.
Random Orbital Motion
In the random orbital mode the sanding pattern is eccentric. The centripetal force resulting from the crankshaft offset causes the pad to spin. This is a weak force and the pad rotation can be stopped if too much hand pressures is exerted on the sander. Due to the eccentric motion and the rotation, the tiny orbits are stretched into long curved loops, which, when interlaced, tend to eliminate any signs of swirl marks.
Learn More About Rotex Sanders
Learn more about the Rotex RO 125 EQ and Rotex RO 150 FEQ online at the Festool USA website or from your local Festool dealer.