Replace ball bearing ETS 125 EQ

[jeromebg]

Hi,
Just bough a used ETS 125 EQ and if the vibration seems fine the rotation is very very slow as you can see here :

The carbon brushes are fine.

I was wondering if I should change the bearings but was enabled to unscrew the bolt holding the conversion kit.

I also notice that without the pad the motor was rotating much more freely than when attached, so could the collar be the problem ?

Thank you for your help View attachment 1

 

[Huey52]

The outer rotation is not driven per se, as exemplified by being able to easily stop it with excess pressure. It's the multiple micro random-orbits that do the bulk of the sanding.

That initial video speed doesn't seem atypically slow but then it's all about the pressure applied. I try to only let the weight of the sander itself be applied and not further influence by hand pressure.

 

[jeromebg]

Thanks for your reply.
Compared to my ETS 150 EQ/5 it's really slow :

 

[Huey52]

Well, of course the ETS 125 is a "finish sander" so not as powerful as your 150. Perhaps you're applying more hand pressure to your 125 as again it doesn't take much to stop the outer rotation?

 

[jeromebg]

No pressure applied on the 125 unfortunately...

 

[makpacman]

The behavior of your 125 seems normal or at least is the same as mine, and all the properly working 5 inch random orbit sanders I have.

Spinning is sort of counter productive in a random orbit sander. It creates more of a repeatable pattern, not random, and makes the sander more difficult to control.

Fast spinning is a sign I look for when the sander is beginning to wear out.

 

[Michael Kellough]

The collar is supposed to rub the pad enough that rotation stops as soon as you pick the sander up.

You can get the pad to spin more than shown in your video when holding the sander off the work and putting the right amount of pressure (with a stick) in the right place on the pad. Such as when sharpening the stick.

Unfortunately this also created heat and the hooks on the pad will melt and the abrasive disk won’t stick well anymore. Do ask how I know.

 

[jeromebg]

Ok, thanks guys.
So if it's the normal behaviour then everything is perfect...
Thanks for your expertise!