We have a ceiling fan that wobbles on the higher speeds. We have heard that putting a coin on the blades can help. Which blade, and does it really help? If not, then what will help eliminate the wobbling?
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Re: ceiling fan wobble
Try taping a nickle on top of one of the blades start in the middle of the blade (from tip towards motor) then turn it on see if it improves..if not change it to a different blade.. keep trying blades till you notice an improvement. Then fine tune it by moving the penny in towards the motor or out towards the tip. It is a time consuming task but it will work.
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Check all your screws especially the set screw at top of fan that goes into rod. Blades could be warped from the water. Ball of fan not set in bracket correctly. When your buying a fan, look for blade pitch.13 degree or better is best. You shouldn't have to use the fan on high unless it's a low-end fan with a low blade pitch. It's costing you more money to run the fan on high. Sorry to get so preachy, I'm a fan dealer .
The fan wobbles cause you bought a crappy Harbor Breeze or Hampton Bay fan. The fan blades need to be balanced with a fan balance kit that comes in the box. You probably threw it out cause you didn't know what the package of weights was for. Get you a Hunter ceiling fan and you won't have an issue with fan wobble, because their fans have better quality control before leaving the factory. If you installed the fan without adequate bracket support- you best get a pro to help you out cause there is no fan wobble help for stupidity.
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
put a piece of masking tape on each blade and number them.while you're up there check that mounting screws are tight.switch position of blades,i.e. move #1to #3,see if it's better or worse;switch #2 & #4 or#4  etc. until you find the combination giving you the best 'balance'
Wait? Why would you want to remove the blade? Are they broken? Is the fan unbalanced? Try cleaning the blade. If the fan still wobbles, try tightening the screws. If the fan still wobbles, Unscrew the blade and unconnect the blade from blade iron. Buy the new blade iron. If the blade is broken, Also buy the new blade.