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PostPosted: Sat Oct 14, 2017 4:23 pm 
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Hi

I've got a cheap oscillating office fan that has stopped working, but the electric motor (brushless I think) still tries, it hums.

I've took it apart and the bushes on the shaft have disintegrated. They are all sticky, just like black squidgy mush rather than anything recognisable

Would this stop the fan working? What kind of material are these bushes? Can they be replaced?

Thanks

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PostPosted: Sat Oct 14, 2017 5:58 pm 
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Could stop it working. Could be something else. Bushes sound like plastic of some sort. Have you oiled it? Oil attacks some plastics. If you have access to a lathe you could try turning some more. Personally I think i'd just bin the whole thing and get another.


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PostPosted: Sat Oct 14, 2017 6:09 pm 
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marcusjkw wrote:
I've took it apart and the bushes on the shaft have disintegrated. They are all sticky, just like black squidgy mush rather than anything recognisable

Would this stop the fan working?

If any electrical part has worn out / melted / disintegrated then yes that will cause it not to work as it should.



marcusjkw wrote:
What kind of material are these bushes? Can they be replaced?

Don't know, doubtful.



But you really put the nail in the coffin when you said

marcusjkw wrote:
cheap

Although in some cases it "is a shame to bin it" it is often more expensive to buy a spare part (If you can get one) than it is to replace the whole thing.

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PostPosted: Mon Oct 16, 2017 11:11 am 
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ok Thanks for the replies, guys. Back to the drawing board :salute:

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PostPosted: Mon Oct 16, 2017 11:13 am 
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Drawing board for what? what exactly are you trying to do?

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PostPosted: Mon Oct 16, 2017 11:13 am 
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This sounds like a job for my sledgehammer Marcus :lol:

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PostPosted: Mon Oct 16, 2017 4:32 pm 
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someone-else wrote:
Drawing board for what? what exactly are you trying to do?


I just want to get the fan to work again. It was left running longer than perhaps it is supposed to run for.

I was rather hoping that, seeing as it seems these bushes are the only things that have broken, I would be able to replace them and the fan would work again.

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PostPosted: Mon Oct 16, 2017 4:42 pm 
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oh, I thought you were trying to make something using the fan / motor as you said "Back to the drawing board"

Don't even bother going to the drawing board, it was just a cheap fan, can't have been on too long since it is already air cooled.

£11 for a new one Click here

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No such thing as "Thou shalt put this wire here, Thou shalt put that wire there" .............Take a picture BEFORE you do the job.

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here


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PostPosted: Thu Oct 19, 2017 10:42 am 
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PAT testing can destroy fans, where the fan is class I often the only way to make contact with an earthed bit of metal is to touch the probe onto the drive shaft, if the tester uses 250 mA this is OK, but if it uses 25A this can cause pitting of the sintered bronze bearings and cause them to wear out prematurely, however near impossible to prove it was the result of PAT testing, the self centring bearings can end up turning around in their housing instead of the shaft turning inside the bearing. The motors are normally brushless so I assume taking about bearings not brushes?

With special fans it is worth the effort, like the one in my Myson radiator, but in most cases it is just a case of buy new.


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