Kapex motor amartour burnt out

[postie]

So my kapex started to have a burnt smell as I was sawing. Stopped using it. Took the motor apart and this is what I found. Part of the housing of the amartuer had a long slit burnt through it.  If you look cloesly at the photo, right at the top of the housing where the slit is, is two burn spots. I assume that might be what was causing the problem, some sort of shorting? Any ideas?. Ordered a new amatour to replace it.
[attachimg=1]

 

[bobtskutter]

Welcome to the FOG.
Looks to me like one of the coils has failed and blown through the plastic infill.

Bob

 

[kevinculle]

Yes, looks like the infill likely failed mechanically leading to the windings emerging from their slot and being sheared off.

 

[ChuckM]

Is your Kapex an EB or REB model?

 

[CumminsDiesel]

Well, it's not a surprise, a very known issue with Kapex.

 

[ear3]

[member=81790]postie[/member] I feel you brother!

 

[Cheese]

Ya, it'd be interesting to know if this is an EB or an REB model Kapex. There was an upgrade to the EB model and supposedly with the introduction of the REB model, the armature issues were supposed to go away.

 

[postie]

Its an EB Model

 

[ChuckM]

Festool should send you a new REB part free of charge since you're willing to fix it yourself. 

Festool?[tongue]

 

[Cheese]

Festool should send you a new REB part free of charge since you're willing to fix it yourself. 

Festool?[tongue]

Festool should have sent ALL of the customers that had an issue with the Kapex armature free parts. A pretty inexpensive show of goodwill.

 

[Peter Kelly]

Similar to the hose garage plastic failure on CT26 and 36 models from a few years ago. This should have been free as well.

 

[ChuckM]

Festool should send you a new REB part free of charge since you're willing to fix it yourself. 

Festool?[tongue]

Festool should have sent ALL snip. A pretty inexpensive show of goodwill.

while removing a poke in the eye that never seems to go away!

P.S. Declaration of interest: I'm a Kapex EB owner and would welcome Festool to replace the armature on my saw with the new REB armature, even though the motor has been working fine all these years.

 

[CumminsDiesel]

Because of bad design, Festool should recall all EB Kapex and replace them with REB.

 

[festoller]

We had a Festool Kapex KS 80 and KS 120 recall in Germany (and UK, see link below) in 2021, for a possible fire hazard on Kapex models built from 2007 to 02/2010! My Kapex was picked up, parts were replaced and I got it back after a few days. I was really surprised that they offer this kind of service even for a more than 10 year old saw. Could this be the same issue?
https://www.festool.co.uk/campaigns/microsites/retrofit#KAPEXretrofit

 

[DynaGlide]

Similar to the hose garage plastic failure on CT26 and 36 models from a few years ago. This should have been free as well.

I keep seeing this comment. My 26 dates to 2017 and no signs of anything breaking. I've carried it around the house many times and it has systainer stacks on it 24/7, a work center for a few of those years

 

[jeh]

Because of bad design, Festool should recall all EB Kapex and replace them with REB.

Mine was 10+ years old when it failed. Bad design or not, no company is obligated to do anything for a product with over 10 years of use. The original warranty was 3 years. Mine failed so I ordered the part and replaced it. No problems since.

 

[ChuckM]

My Kapex EB is now in its 9th year of use...so far so good. I should say so far so splendidly good, because it gives the kind of precision cuts I need. I hope its motor won't burn like what we have seen in this forum. At times, I use it for an hour or more continuously in preparing stock, and that's when I may wonder if it'd "smoke."

Not sure if it'd actually help: I plug the saw and vac into two separate outlets (20A for the saw and 15A for the vac), and I vac clean the motor area after every heavy use (one vendor told me they had a Kapex returned from a tradesperson for repair, and a cake of dust could be seen under the cover).

 

[Packard]

I googled “who supplies the electric motors to Festool”?  I did not find the answer to that, but I only read the first page on Google. 

But some of the articles about how Festool selects their vendors is interesting.  Any rate, I hate to waste a good Google search, so here it is:
https://www.google.com/search?q=who...estool&ie=utf-8&oe=utf-8&client=firefox-b-1-m

Though this result might suggest that the armature is still good. [eek] [a magazine interview with Festool engineers].
https://easyengineering.eu/interview-with-festool-power-tools/

FESTOOL: Developing products that last for decades – and that tradespeople can always rely on. With optimal performance, together with absolute robustness.

 

[ChuckM]

That interview was seriously missing something that'd otherwise be more reassuring (while we're on the subject): a picture of the Kapex!!! [big grin]

 

[Packard]

And every time I see an image of a right-tilt table saw, I get jealous.  I have workarounds for that, but a right tilt would be ideal.