I purchased the 12" desk fan and although it is running okay, as in fairly quietly, I see that there is kind of a "wobble" when you look a the running blade from the side. It looks like the blade assembly is "pumping" in and out at a fast and consistent rate. Is this part of the design? Or is this something I will need to fix? I'm not willing to do too much to this fan because it wasn't cheap and I believe that products should work right out of the box. Please advise!!! Thank you! My concern is that running the fan with this kind of "wobble" will damage the motor, if it is in fact not part of its regular function.
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Re: Fan Blade Wobble or Part of the Design?
The problem you are getting is due to a warped fan blade, assembly of motor, or unbalanced spin radius. Your best bet on this is to seek a replacement from your manufacturer, as this is likely a fault of the assembly process, or even of manufacturing the fan blade set anyway.
While the problem is not a major one, and you will be just fine using said fan for some time, it will shorten the life of the motor, which will eventually run dead due to extra stress. To prevent excess wear and tear, run the fan at a slightly lower speed, i.e. on 2, maybe even 1. At higher speeds, the centripetal force will cause the blades to warp further, and pull the motor back and forth, and thus, cause the unit further damage.
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fan wobble is not from balance but from uneven blade angle
if one blade is bent higher than the others or if one blade is twisted more than the other wobble will result
If you assembled the blades onto the fan motor
make sure that the mounting points are not hung up on the body ridge
next using a tape measure at one position measure the blade tips from the floor or ceiling and bend the other blades up or down until they are all the same distance
Hold the tape steady and turn the fan by hand
next at the same point measure the difference between the front and rear of a blade and make sure all of the others have the same measurement
Might have something loose or broken and is hitting the fan inside. If it is a slushing sound, that is the water being slung back up unto the fan blade and condensor coil to cool the inside of the unit.
The Exhaust Fan/Video Card System Fan Kit from StarTech is an add-in cooling fan designed to fit in the PCI or ISA expansion slots of any computer. It is used to exhaust warm air out preventing problems due to overheating components. The exhaust fan inlet faces adjacent PCI or AGP cards and makes a great video card cooler for hot running 3D accelerator cards like the Voodoo TNT2 GeForce256 and others. A quiet running brushless DC motor coupled with a high efficiency blade design is capable of moving 36 CFM (cubic feet per minute) of air. Power is supplied to the fan using a standard LP4
hope this helps
Interesting situation.. not many people want to down-size a fan. Anyway, reducing the size of the fan blade shouldn't cause a problem - as long as the pitch or angle of the blade remains the same or is less than the original. Increasing the angle with a smaller blade could actually move MORE air than what the motor was designed to do - resulting in overloading and shortening the motor's life in the best case scenario. Worst case scenario - well, anything for electric devices in a worst case scenario usually involves fire, burns and even death (though not likely to happen).
Prior to starting, make sure all the blades are the same in every way including: length, width, angle and weight. A warped blade can cause wobble, too. Stand on a ladder and spin the fan by hand. Look for a blade that is tipped up or hangs lower than the others. Make adjustments as needed to correct (it may not be possible to correct a warped blade - so be forewarned). If any of the variables listed in the first sentence of this paragraph are different from those of the other blades, wobble and motor noise will result. Neither condition should be allowed to exist longer than absolutely necessary. You can minimize these effects by operating the fan at a slower speed. Generally, the blades should be pretty close in all of these variables - but a wobbly fan indicates an imbalance. Weights placed on fan blades can help correct wobble - but can be tricky to determine which blade is the cause.
Measure from the same spot on the ceiling to the outer most tip of each blade (by rotating to the tape). The distance should be the same, if not check fan blade screws for tightness. You might have to bend the fan blade brackets a little to get the same measurements, if the screws are all tight. If all this lokks good, you might to use a balancing kit...just follow the instructions...it's not too bad to do
Stick a small weight to the end of one of the fan blades with some sellotape , run the fan , if the noise gets worse transfer the weight to another blade.
When the fan is running quietly go to the blade opposite to the one with the weight on and drill out a 10mm hole in the material.
Take the weight off and check for balance if it is still out drill another smaller hole in the blade till you get a balance
Drill the holes a the tip of the blade so that you get the best effect from the removal of material