Anyone know the reason for this? Rotex 150 spinning fast.

[e_oggie]

Hi! We have exactly the same problem. I talked with Tooltechnic Systems Service and they suggested that I'd better bring the machine to them.
They couldn't locate the problem only by description. I'll write back when I have more info.

 

[semenza]

Hi! We have exactly the same problem. I talked with Tooltechnic Systems Service and they suggested that I'd better bring the machine to them.
They couldn't locate the problem only by description. I'll write back when I have more info.

Hi Oggie,

Happy first post !  [smile]

Hope you get the problem solved , and please let us know how it turned out.

Seth

 

[e_oggie]

Thanks, Seth!

Meanwhile, I found this brief explanation:

Wear

When a random orbital pad spins too fast there can be burnishing even if the sandpaper is not contaminated. The rubber pad brake used in Festool random orbital sanders is engineered to hold back the spin rate of the pad. This allows for an optimum pattern of movement where the grit particles on the abrasive actually reverse direction and "pirouette" in small loops as they travel in their circular orbit. It is quite a dance.

Each crystalline grit particle has a chance to cut on all of its facets and the resultant scratch pattern consists of very short strokes that interlace in all directions. After many hours of use, the pad brake rubber will eventually wear and allow the pad to spin faster. When the pad eventually spins too fast, the grit particles will not have a chance to reverse direction and only one half or less of their surfaces will be cutting… or actually plowing.

http://blog.festoolusa.com/post/2007/11/01/The-Battle-Against-Swirl-Marks.aspx

 

[e_oggie]

Hi! As I wrote e few days ago we had the same problem - the random orbital pad spun too fast. We took it to the Tooltechnic Systems Service people and they identified the problem right away.
The rubber pad brake was worn out and didn't hold back the spin rate of the pad. It took 2 min. and around 10 euro (the cost of the rubber pad) to have it replaced. The Festool technician said to me that one should expect wearing out of the rubber pad, especially while working in the grinding mode. This issue is addressed by Festooll in the newer model by placing the pad break onto the sanding pad.