Electronics > Repair
How to unfix this fan from the shaft of this DC motor?
saaluc:
--- Quote from: timeandfrequency on December 19, 2024, 07:25:57 pm ---
--- Quote from: saaluc on December 13, 2024, 04:45:56 am ---Might your method break some parts?
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I used this method 3 or 4 times a few years ago and if you follow my instructions and those of @drhex who reformulated it in a better english than mine, and also use the tools I suggested, you won't break any part.
A few cracs in the fan blades where the string was placed may appear. Remember that such a fan assembly is clearly constructed in such a way that it cannot be disassembled. So it's not really realistic to expect every piece to remain in perfect condition.
It is wise to use only one unique strong string. You should put only one loop of this string around each fan blade. It is important that the pulling force is the same on each blade : you will see that the string loops will slightly slide around the screwdriver's blade (used as a lever) to provide an uniform pulling force. The more the string is slippery, the better is goes : you may use a bit of liquid soap for that.
The force required is really measured in tens of kg (hundreds of N for purists).
You can help by warming up the motor shaft through the existing hole in the hub of the fan rotor. Use the tip of your soldering iron, but not more than 20 seconds. If the plastic around the shaft completely melts, the fan rotor will be destoyed.
I couldn't find a similar fan in my stash, so I used a more vanilla one.
Here are some photos showing how to use the vice to hold the assembly, and the screwdriver as a lever.
You must use a vice much larger than mine: jaws must be at least 180 mm wide, otherwise there is not enough room to place the fan assembly under the jaws.
Avoid tightening the jaws against the plastic frame: the fan assembly must remain loose under the jaws.
--- Quote from: saaluc on December 18, 2024, 04:35:56 pm ---
--- Quote from: timeandfrequency on December 15, 2024, 02:48:37 pm ---
--- Quote from: saaluc on December 14, 2024, 03:25:56 pm ---[...], can the fan be refixed strongly on the new DC motor's shaft? Or I will need a new fan too?
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Yes you can refix the existing fan rotor on the new motor's shaft. It's a press fit.
If there's a brass sleeve on the existing shaft, it will need additional work, but it is still possible.
Tell us a bit more about that fan assembly.
Where does it come from ? What it is used for ? How much would it cost to buy a new one ?
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The fan assembly is for a haidryer. There is no new one to buy.
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Well, the price of a new hair dryer is around 20 bucks. Not sure if it's worth to mend it.
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Thank you very much indeed for your detailed tutorial.
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