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#1
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Fan differences?
What is the difference between sleaves fan and ball bearing fans?
thanks! |
#2
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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
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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 -- To send me, Halfgaar, email, remove remove from my email address. |
#4
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Ball bearing fans are heavier duty and last much longer.
-- DaveW "Tai Tze Hou (Alvin)" wrote in message ... What is the difference between sleaves fan and ball bearing fans? thanks! |
#5
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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
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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
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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
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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
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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
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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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