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[hardocp] BFG Announces BFG Power! - Page 2

post #11 of 20
EVGA dont make PSU's do they??
post #12 of 20
Quote:
Originally Posted by SerenityKill3r View Post
EVGA dont make PSU's do they??
Nope
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post #13 of 20
Quote:
Originally Posted by shinji2k View Post
A conspiracy for built in obsolescence? The numbers I've seen for the average sleeve bearing fan put lifespan at ~50000 hours (5.7 years continuous) @ 40C. Ball bearing fans have ~50% longer lifespan at this temperature. I've seen many places say that horizontal positioning affects lifespan but no one ever gives a reason why. Is the design just flawed and there is more wear at different positions? Is it because the lubrication evaporates quicker? I also haven't seen any numbers showing just how much it affects lifespan.
I'm trying to find how much of a noise difference. I could have sworn that Vapor mentioned it in his testing at XS.

The reason for shorter lifespan probably has to do with lubrication. When mounted vertically, the lubricate pools the length of the shaft when off. When the fan is on the entire shaft gets coated and circulates the lubricate around it. When mounted horizontally, the lubricate pools only at one end of the shaft. Therefore, the entire shaft does not get lubrication when the fan is either off or on.


Quote:
Originally Posted by SerenityKill3r View Post
EVGA dont make PSU's do they??
Nope, just video cards, motherboards, TV tuners, Display adapters, and waterblocks.
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post #14 of 20
Tell then to start making PSU's Duckie
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post #15 of 20
For anyone that's curious, and I know for some this is old hat so feel free to ignore this post, here is a Yate Loon 120MM sleeve fan taken apart.

First picture is the rubber cap covering the "bearing".

Second picture shows the nylon snap-ring that holds the spindle in place.

Third picture shows the snap-ring removed, exposing an o-ring and then a stainless steel washer over the brass bushing the spindle spins inside of.

Fourth picture shows (from left to right, top to bottom) the snap-ring, rubber cap, o-ring, stainless washer, fan frame with brass bushing installed and finally the actual fan with stainless steel spindle.



post #16 of 20
First picture is a close up of the fan blade assembly. There's a (blurry) stainless steel spindle with yet another bushing and o-ring at the base.

These o-rings help keep the lubicant inside the center of the fan. The bushing help with side-load tolerance.

Second picture shows the inside of the fan motor with the driving coils.

No doubt ball bearing lasts longer, but it shouldn't be said that a sleeve bearing fan doesn't last long. There's a lot of concern about side loads, etc., loss of lubricant, etc. But since a good fan should have 0 tolerance between the spindle and brass bushing, aka "bearing", and given that the relationship between the coils and magent in the fan blade assembly creates a magnetic field that actually allows the spindle to "float" within the bushing even if there was poor tolerance, there is virtually no friction at the spindle. Furthermore, the o-rings should contain the lubricant as well as keep dust and dirt out that can actually increase wear.

Bottom line, the quality of the fan is the biggest determining factor. If the o-rings do not seal well and/or there is more tolerance between the spindle and bushing, the fan will certainly wear out faster than a better made fan with tighter tolerances and better seals.

post #17 of 20
Quote:
Originally Posted by jonnyGURU View Post
First picture is a close up of the fan blade assembly. There's a (blurry) stainless steel spindle with yet another bushing and o-ring at the base.

These o-rings help keep the lubicant inside the center of the fan. The bushing help with side-load tolerance.

Second picture shows the inside of the fan motor with the driving coils.

No doubt ball bearing lasts longer, but it shouldn't be said that a sleeve bearing fan doesn't last long. There's a lot of concern about side loads, etc., loss of lubricant, etc. But since a good fan should have 0 tolerance between the spindle and brass bushing, aka "bearing", and given that the relationship between the coils and magent in the fan blade assembly creates a magnetic field that actually allows the spindle to "float" within the bushing even if there was poor tolerance, there is virtually no friction at the spindle. Furthermore, the o-rings should contain the lubricant as well as keep dust and dirt out that can actually increase wear.

Bottom line, the quality of the fan is the biggest determining factor. If the o-rings do not seal well and/or there is more tolerance between the spindle and bushing, the fan will certainly wear out faster than a better made fan with tighter tolerances and better seals.
Fan blade imbalance would also increase wear. I believe some Panaflos have weights add on the spindle to correct imbalance issues.
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post #18 of 20
Quote:
Originally Posted by darksideleader View Post
hmm mabye they should make a complete system : BFG PSU, BFG 8800GT and BFG 750i motherboard (Hopefully they will follow evga and make one).
I've been looking for the trifecta with BFG. My PSU has an annoying turbo button to ramp up the fan speed, but otherwise, it's rock solid. I cannot complain about my GTS, and a motherboard would just round everything out. I'd seriously consider a 750 and up board from BFG as

1. They're a US company located not too far from me. (HQ = Lake Forest, IL)
2. I've had good experience with their customer service.
    
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post #19 of 20
Quote:
Originally Posted by Polo224 View Post
I've been looking for the trifecta with BFG. My PSU has an annoying turbo button to ramp up the fan speed, but otherwise, it's rock solid. I cannot complain about my GTS, and a motherboard would just round everything out. I'd seriously consider a 750 and up board from BFG as

1. They're a US company located not too far from me. (HQ = Lake Forest, IL)
2. I've had good experience with their customer service.
BFG has done motherboards in the past, but when everyone is just selling the exact same motherboard with different stickers on it, you end up just playing a game of "who can give the most product away". We're thinking about getting back into it, but reference boards be damned.

For reference I've attached pics of a disected ball bearing fan....

First picture is of the assembled hub. Second picture is the removed retention clip. Third picture is the exploded fan hub assembly. Fourth picture is a close up of the two bearing races and the spring that goes between the fan blade assembly and the hub.

Fifth picture is a cut-away diagram of a bearing showing the cage, with the balls in it, rolling between the inside and outside races.




post #20 of 20
First picture is a close up of the spindle. This time there's a spring on the spindle that actually pushes the fan-blade assembly away from the side of the race to help reduce wear on the seal.

Last picture shows the fan motor with bearing installed.

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