Electronics > Repair
How to unfix this fan from the shaft of this DC motor?
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Simmed:

--- Quote from: saaluc on December 13, 2024, 04:37:23 am ---
--- Quote from: drhex on December 12, 2024, 05:40:09 pm ---You wrap a piece of strong string around the fan blades so you can pull on them. Then you rest the fan shroud underneath a bench vise so that the shroud sits on the vise which is opened enough for the fan itself to pass through. Next you use a suitably stable lever pushed through the string to lever against the top of the vise to pull the fan of the axle. This may break the shroud, but you wouldn't have gotten it off another way then.
Another idea would be to drill a hole through the center of the fan until you arrive at the axle and use a suitable bearing puller.

--- End quote ---

Frankly, I was unable to understand your method without a video or some pictures. But it seems that it will break some parts. Except the DC motor, I need all the other parts for repair.

--- End quote ---


lets call the nose part of of prop = the hub of the prop
the string is like a little noose behind the hub
1 pair tied around = all the force will rest on 2 string
so maybe it will need 10 12 14 + pairs on the hub and then another set for the plastic housing?
so now you play a tug of war
Poroit:
G'day saaluc,

I suggest it is a press fit on a keyed or splined shaft.

Do you own or have access to a drill press?

1.Get some square pieces of chipboard or similar, slightly larger that the diameter of the fan body.

2.Cut holes with a hole saw through the centre of these pieces of chipboard just slightly larger than the diameter of the motor.

3.Stack your pieces of chipboard on the drill press table, high enough so you can drop the motor and fan into it with clearance beneath the motor.

4.Use a suitable size pin punch or similar, inserted into the chuck of the drill press and gently push down against the shaft.

5.If I am correct, you should feel them start to separate.

I hope this is clear enough.

timeandfrequency:

--- Quote from: Poroit on December 13, 2024, 07:25:37 am ---[...]
5.If I am correct, you should feel them start to separate.

--- End quote ---
Separate : actually not, but it will probably break the whole assembly.
Don't forget that the motor is attached to the plastic frame by two screws, as I mentionned earlier. Watch the motor drawing to locate the screw holes.
Actually, the screws can only be safely unscrewed once the fan rotor has been removed.

If you did not have such an assembly in your hands before, it is pretty difficult to figure out how to disassemble it safely. A few fails (= assembly destroyed) are required before devising a suitable method.



--- Quote from: saaluc on December 13, 2024, 04:45:56 am ---Might your method break some parts?

--- End quote ---
No, if you follow the method and use the tools I suggested, usually they survive.
Please remember that due to their construction, these fans are made in such a way that they cannot be taken apart.
saaluc:
Thanks to all you for your insights.

If I manage to unfix this fan from the shaft (for example, by the string method), can the fan be refixed strongly on the new DC motor's shaft? Or I will need a new fan too?
Poroit:
Cheers timeandfrequency,

Oops.....I missed those mounting screws.

The tug a war method does not have any finite control on how quickly the parts separate.

Both participants may end up on their backsides with a handful of broken bits........but nothing ventured nothing gained.

G'day saaluc,

Do you have any contacts who might have a bearing pulley you could adapt for the job?

Reuse of your existing fan will depend on the new motor shaft size and type.

Hopefully you can find something similar.
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