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Fan differences?



 
 
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  #1  
Old October 6th 03, 04:10 PM
Tai Tze Hou \(Alvin\)
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Default Fan differences?

What is the difference between sleaves fan and ball bearing fans?

thanks!


  #2  
Old October 6th 03, 04:34 PM
Mike Walsh
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Sleave bearings are cheap. Ball bearings are reliable.

"Tai Tze Hou (Alvin)" wrote:

What is the difference between sleaves fan and ball bearing fans?

thanks!


--
Mike Walsh
West Palm Beach, Florida, U.S.A.
  #3  
Old October 6th 03, 06:43 PM
Halfgaar
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Tai Tze Hou (Alvin) wrote:

What is the difference between sleaves fan and ball bearing fans?

thanks!


To be more precise, sleeve's are metal surfaces (with oil between them)
which slide over eachother. A ball bearing is two metal cylinders (one
small one which fits in a lager one) with balls between them. The latter,
obviously, is a better design. But, suprisingly, very-low-noise fans are
mostly sleeve's.

Halfgaar
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To send me, Halfgaar, email, remove remove from my email address.
  #4  
Old October 7th 03, 12:16 AM
DaveW
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Ball bearing fans are heavier duty and last much longer.

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DaveW



"Tai Tze Hou (Alvin)" wrote in message
...
What is the difference between sleaves fan and ball bearing fans?

thanks!




  #5  
Old October 7th 03, 04:47 PM
Lane Lewis
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"Tai Tze Hou (Alvin)" wrote in message
...
What is the difference between sleaves fan and ball bearing fans?

thanks!


Never ever put a ball bearing fan in a PC

When it comes to small fans, sleeve bearings are the best. Ball bearings are
much more useful in larger motors.

The trick is buying quality sleeve bearing fans as many on the market
are just junk.

Try Panasonic Panaflo or Papst fans, they cost more than ball bearing fans
but will last much longer and run much quieter.

http://www.directron.com/papst.html

http://www.directron.com/panaflo.html

http://www.casecooler.com/vanstealquie.html

Lane


  #6  
Old October 7th 03, 07:28 PM
kony
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On Tue, 07 Oct 2003 15:47:26 GMT, "Lane Lewis"
wrote:


"Tai Tze Hou (Alvin)" wrote in message
.. .
What is the difference between sleaves fan and ball bearing fans?

thanks!


Never ever put a ball bearing fan in a PC


That's a bit of an overstatement, isn't it?

Sleeve-bearing fans should NEVER be used in any application calling
for non-vertical mounting, and even the best sleeve-bearing fans
aren't suited for long-term use in high-heat, like a PSU exhaust. By
long-term, I mean the life of the power supply, which could be a dozen
years.


When it comes to small fans, sleeve bearings are the best. Ball bearings are
much more useful in larger motors.


Here is where I strongly disagree. Look at all the video card fans
and northbridges that fail because they're sleeve-bearing. Replaced
with ball-bearing fans, the user can expect 300% or longer lifespan.

It is not enough to relube the smallest of fans, their bearings are
significantly worn by the time the typical user notices anything is
wrong.

The trick is buying quality sleeve bearing fans as many on the market
are just junk.

Try Panasonic Panaflo or Papst fans, they cost more than ball bearing fans
but will last much longer and run much quieter.


Agreed, those two are great sleeve-bearing fans. For vertical mount,
any use other than tiny fans, or high-heat, either of those are very
good choices. On the other hand, Ball-bearing fans can be barely
louder, the difference can be slight enough to be unnoticable, and
narrowing yourself to only the above two fans will usually result in
paying a lot more per fan.


Dave
  #7  
Old October 7th 03, 09:26 PM
ric
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Lane Lewis wrote:

Never ever put a ball bearing fan in a PC

When it comes to small fans, sleeve bearings are the best. Ball bearings are
much more useful in larger motors.


Horse pucky!

A ball bearing fan is better ANYWHERE that will be exposed to increased
temperature, like a PC exhaust fan or a PC PSU fan.

I have removed enough frozen and sticky 80mm sleeve bearing fans to
cover the walls of my house. I rarely (or never) encounter a failed
ball bearing fan.

I notice you didn't mention *why* one should never put a ball bearing fan
into a PC. Well? Why not?
  #8  
Old October 7th 03, 09:53 PM
ric
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kony wrote:

Try Panasonic Panaflo or Papst fans, they cost more than ball bearing fans
but will last much longer and run much quieter.


Agreed, those two are great sleeve-bearing fans. For vertical mount,
any use other than tiny fans, or high-heat, either of those are very
good choices. On the other hand, Ball-bearing fans can be barely
louder, the difference can be slight enough to be unnoticable, and
narrowing yourself to only the above two fans will usually result in
paying a lot more per fan.


And he completely ignores the fact that Papst (ebm) makes both ball bearing
and Sintec sleeve bearing 60, 80 and 92 mm fans, and the ball bearing fans
have longer MTBF (L10 life) than the sleeve bearing fans.
  #9  
Old October 8th 03, 02:58 AM
Lane Lewis
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"kony" wrote in message
...
On Tue, 07 Oct 2003 15:47:26 GMT, "Lane Lewis"
wrote:


"Tai Tze Hou (Alvin)" wrote in message
.. .
What is the difference between sleaves fan and ball bearing fans?

thanks!


Never ever put a ball bearing fan in a PC


That's a bit of an overstatement, isn't it?


No there's no reason to.


Sleeve-bearing fans should NEVER be used in any application calling
for non-vertical mounting, and even the best sleeve-bearing fans
aren't suited for long-term use in high-heat, like a PSU exhaust. By
long-term, I mean the life of the power supply, which could be a dozen
years.


A quality sleeve bearing fan will last a dozen years. even in a PSU, even
horizonally mounted. Where did you get that "NEVER" from :O)



When it comes to small fans, sleeve bearings are the best. Ball bearings

are
much more useful in larger motors.


Here is where I strongly disagree. Look at all the video card fans
and northbridges that fail because they're sleeve-bearing. Replaced
with ball-bearing fans, the user can expect 300% or longer lifespan.


Cheap fans fail not high quality ones.


It is not enough to relube the smallest of fans, their bearings are
significantly worn by the time the typical user notices anything is
wrong.


Cheap fans yes. They can make sleeve bearing fans last twenty years if they
want to but most manufactures just buy cheap ones. The problem is not in the
design as it is in the cheap materials used, such as the quality of the oil
and the material of the bearing itself. Most manufactures buy low temp oil
and use a low quality brass alloy for the bearing.


The trick is buying quality sleeve bearing fans as many on the market
are just junk.

Try Panasonic Panaflo or Papst fans, they cost more than ball bearing

fans
but will last much longer and run much quieter.


Agreed, those two are great sleeve-bearing fans. For vertical mount,
any use other than tiny fans, or high-heat, either of those are very
good choices. On the other hand, Ball-bearing fans can be barely
louder, the difference can be slight enough to be unnoticable, and
narrowing yourself to only the above two fans will usually result in
paying a lot more per fan.


Ball bearing fans are reasonably quiet when you first install them and then
unlike a sleeve bearing fan get progressively louder as they wear, negating
the small difference in mtbf since they have to be replaced due to noise
anyway.

Sleeve bearing fans got a bad rap due to the large number of failures of
low quality fans. I recently pulled a panaflo from a PSU that was in a IBM
486 Valuepoint that cost $5000 at the time (94). It was still working
perfectly.

The only advantage of BB fans is noise. Usually before they quit all
together they will make one heck of a racket warning the user to replace it.

Lane



  #10  
Old October 8th 03, 03:05 AM
Lane Lewis
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"ric" wrote in message ...
kony wrote:

Try Panasonic Panaflo or Papst fans, they cost more than ball bearing

fans
but will last much longer and run much quieter.


Agreed, those two are great sleeve-bearing fans. For vertical mount,
any use other than tiny fans, or high-heat, either of those are very
good choices. On the other hand, Ball-bearing fans can be barely
louder, the difference can be slight enough to be unnoticable, and
narrowing yourself to only the above two fans will usually result in
paying a lot more per fan.


And he completely ignores the fact that Papst (ebm) makes both ball

bearing
and Sintec sleeve bearing 60, 80 and 92 mm fans, and the ball bearing fans
have longer MTBF (L10 life) than the sleeve bearing fans.


Didn't ignore anything, Ball bearing fans do have their applications but a
PC is not one of them due to the noise factor.

Lane


 




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