Rotex 125 Sander - vibrations in RO mode (button left) and speed 1 - 2

svaens

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Aug 2, 2016
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Hi all,

Thank god there's a useful forum like this with an obviously keen community. Thanks to you, and sorry if my first post is talking about (potential) problems instead of success.

As the title hopefully describes, I've (recently) bought a Rotex 125 FEQ sander.

My problem, or question, is regarding its use in RO mode (that is the random orbit mode without the driven rotation) and on low speed:

I find the vibrations to be extreme in this mode and at this speed. It only is manageable (usable) as you increase the speed past 3 (with 6 being the smoothest).

Confused/Surprised by this, I started looking for possible causes. I don't know if I imagine this, but it almost seems as if there is a slight vertical (perpendicular to the wood surface) movement when I try to track the black plastic part of the sanding pad. But maybe that is a trick of my eyes, considering there is that horizontal eccentric movement.

Regardless of if my eyes are deceiving me, my hands are surprised.

Admittedly I do not have a proper festool (or otherwise) dust collector, but have rigged up my regular house vacuum cleaner to the tool.
But the vibration is as severe and surprising if using no vacuum (if that should be better).

The question is, is that normal? Can anyone else who has a festool Rotex 125 FEQ tell me their experience with using it in this setting?

I've posted two temporary videos:

=youtu.be

The first video shows the tool running close-up;
a) first in dual rotation mode, on speed 1, showing what looks like to me somehow vertical movement
b) second, the sound of the tool in RO mode, speed 1 (a surprising amount of vibration)
c) third, the wobble of the tool in dual rotation mode, speed 6.

All this could be normal. I do not necessarily intend it as criticism of the tool. It is simply because I am unfamiliar with this power tool, that I want to make sure it is "normal" for this tool. This is a private use tool, and I am not someone to throw money around (not having enough of the stuff). So I do not want to keep a tool if it is somehow defect 'out-of-the-box'.

But if this is normal, and (as they say) I just have to get used to the tool, then that is fine, and I will do my best. It's just that I have watched this video with Larry Smith


and, yes OK, he is using the 150, but still.... it looks so much smoother than how it feels for me!

Thanks in advance for any and all replies.

Sean

 
It is normal for sanders to become a bit irregular when you dial them down below 3. You take so much power away they're getting trouble overcoming the friction with the wood. I never use them below 3 or 4, full speed is most of the time the best option, unless the material is really delicate, and in that case the Rotex isn't the proper sander anyway.
 
Alex said:
It is normal for sanders to become a bit irregular when you dial them down below 3. You take so much power away they're getting trouble overcoming the friction with the wood. I never use them below 3 or 4, full speed is most of the time the best option, unless the material is really delicate, and in that case the Rotex isn't the proper sander anyway.

Hi Sean,

  Welcome to the forum!
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    ............. and overcoming the suction from a vac that can't be turned down.

Seth

 
Sean, I don't get to read this forum much nowadays but came across your thread. I have the ro150 and of course it can be erratic at first but if you haven't already discovered, I can put your mind at rest on certain points.
Sometimes the pad when twisted to fit the bayonet mount isn't perfectly flat esp the softer/ intermediate pads. The hard pad I've found to be near flat to the rotation so less buffeting and more stable, you will get used to it over time.
If you use lower grits in RO mode at lower setting as mentioned it will drag so suit the grit to the job and with experience with the machine it will fall into place.
 
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