Rotex 150 Discharge

Underused......

perhaps try popping the brushes out and try again on a piece of scrap???

you could have a hair or two that's caught up in the sanding process.

by the way, I haven't tried these yet but I believe they also have brass brush inserts....... probably used more when sparks are generated.
which, on second thought if you had used the rotex, with the nylon brushes on a previous project that might have generated a spark.....it could have melted the ends of some of the brushes,
thus generating that spaulted black look.
I'm not sure how soft the brass brushes would be.
( I didn't look it up in the catalog, just from memory......)

still half asleep, my 2cents at 3 in the morning here ;) ;) ;)

all the best,
Monte

ps. good photo ;D ;D ;D
 
Thanks for the suggestions Monte :)
I wouldn't know where to find the brushes in the rotex.  I popped the front part off, but couldn't see much (it's all enclosed)
I didn't want to go messing with it too much ;)
If there's any hair in there, its not mine (my hair is shaved to about 1cm :D)
I've tried to see where they (the black crumb things) are falling from while sanding, but haven't been able to pin point it :-\
They resemble little pieces of ash.  If I touch them, they smear.
Cheer! :)
 
What Model Rotex is it?  The older model used a replaceable rubber dust/debris seal under the pad.  It would be that rubber piece gettring chewed up around the shaft.  You'll have to remove the sanding pad to see it.

Chris...
 
Well I have both the new and the old 150 and haven't personally experienced this.  Doesn't look good...  If it's nothing obvious you should just send it in for Festool to have a look at it.  Sorry  :(

Chris...
 
Thanks Chris,
Maybe one of the Festool guy's will jump in, with an explanation.
I also haven't seen or heard this before ???
 
Underused.......

opps, forget everything I said above.

Somehow in my mind I thought you were talking about the ras 115.

Goes to show I shouldn't post anything at 3 in the morning.

I'll count sheep next time I can't sleep instead of going online.

Monte  :'( :'( :'(

 
My first suspect would be the rubber collar under the pad, called the pad brake. It keeps the speed of the sanding pad down when used in orbital mode, and it wears down over time. It could be that some grit or other debris has got between the pad brake and the pad, causing the pad brake to shed small particles of black rubber. I'd suggest removing the pad brake, cleaning it and the surrounding area, re-assembling it all, and then trying it out to see what happens. It's designed to be user-replacable, and a new one seems to be either 471911 or 465472

See the illustration and caption from the current US Rotex 150 manual:

Rotex%20150%20Pad%20Brake.jpg


The UK catalogue also says "The sanding pad brake prevents the abrasive disc from scratching the workpiece on initial contact, eliminating gouges and costly re-work."

I have seen a video sowing the increase in speed that happens when the pad brake gets worn, and will try to find a link.

Forrest

 
That is exactly right Forrest. I had an RO 150 and it did shoot out black pieces .

When I replaced the pad I saw the Pad brake was slightly chewed up on the edges.

I think you hit the nail on head with that diagnosis.

Nickao
 
Monte,  I was under the impression Festool uses brushless motors, no?
 
I had some black particles when I was using my RO125 late one night. Couldn't figure out why. It also wasn't being as aggressive as usual. That's when I noticed that I hadn't put the sandpaper on the hook and loop pad!  :P Come on - I know I'm not the only one to have done this!  :D Turns out the the h&l is remarkably durable stuff...
 
sToolman,

You are right about the brushless motors, but when I was first reading the original post in the tread, at 3 in the morning I was thinking RAS not Rotex.
Soooooooo, if it was a RAS with those issues it could have been the curved nylon brush insert that directs the flow of the vacuum.
You have the option on the "RAS" to insert a nylon brush or a brass brush. ( Item # 484727 & Item # 484728)
The brass brush insert is used ( I would guess) for when sparks are generated in the removal process......you wouldn't want to use the nylon brushes because they could melt.

but, as I had already noted in a second post of this thread I was delusional at 3 in the morning and should have been counting sheep with fesstool tee-shirts rather then responding to technical issues when I couldn't sleep.
;D ;D ;D ;D ;D ;

Monte

 
nickao said:
That is exactly right Forrest. I had an RO 150 and it did shoot out black pieces .

When I replaced the pad I saw the Pad brake was slightly chewed up on the edges.

I think you hit the nail on head with that diagnosis.

Nickao
Click to expand...

I'm glad to hear that someone has had the same problem, and can confirm my diagnosis! I haven't seen any black pieces on my RO125 yet, but I'll certainly keep a look out for them.

Forrest

 
The Rotex RO150 definitely has brushes. Just to be clear, the "brushes" I'm referring to are part of the motor, not like the brushes you get on the RAS115 which partly surround the sanding pad and catch debris.

Here is an extract from the parts diagram, and the motor brushes are number 45.

Rotex_Brushes.jpg


The UK manual (but not the US one) states:

---------
The tool is fitted with special motor brushes with
an automatic cut-out. When the brushes
become worn the power supply is shut
off automatically and the tool comes to a
standstill.
---------

The above statement about the brushes having an automatic cut-out may or may not apply to the Rotex for sale in the USA.

Forrest

 
Forrest Anderson said:
The tool is fitted with special motor brushes with
an automatic cut-out. When the brushes
become worn the power supply is shut
off automatically and the tool comes to a
standstill.

The above statement about the brushes having an automatic cut-out may or may not apply to the Rotex for sale in the USA.

Forrest
Click to expand...

  Forrest, while in Henderson, David McGibbon talked to us about a lot of little details in the tools, the cut-out feature was one of them, so yes we have that feature in the US also.
 
Brice Burrell said:
Forrest, while in Henderson, David McGibbon talked to us about a lot of little details in the tools, the cut-out feature was one of them, so yes we have that feature in the US also.
Click to expand...

Brice

Thanks for the confirmation. It will be something to remember when a FOG member reports that his Rotex has suddenly stopped working!

Forrest

 
Forrest,
Thanks for putting all that information together ;)
I'll take the pad off and have a look in there.  I'll report my findings.
If it is rubber discharging, its very soft.  If I touch it, it breaks down and smears the work (rather like ash).  There must some friction in there to cause that eh :-\
Thanks again!
 
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