Electronics > Repair

How to unfix this fan from the shaft of this DC motor?

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drhex:
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.

saaluc:

--- 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.

saaluc:

--- Quote from: timeandfrequency on December 12, 2024, 05:34:26 pm ---
--- Quote from: saaluc on December 12, 2024, 04:57:23 pm ---May I ask you to upload a video or at least some pictures of your method?

--- End quote ---
Yes but not this evening.

--- End quote ---

Except the DC motor, I need all the other parts for repair.

Might your method break some parts?

CatalinaWOW:
There are three methods I have seen for mounting fans like this to a motor.

1.  Press fit (or adhesive).  The only way to remove these is to drive the shaft out using a pin punch at the hub or pull it off with something like the string approach mentioned earlier.  A fixture with legs that pass through the shroud blades and catches the edge of the fan would help, and a potentially useful version wouldn't be too hard to design and 3D print.  Another approach to "pulling" it off is to bend a piece of flat steel into an L shape, with the base leg of the L just long enough to slip between the base of the fan hub and the motor body.  This can be used as a prying tool (preferably with one on each side working together).  As stated before it is easy to damage parts with this method.  Particularly if it is attached to the shaft by method 2. 

2.  Threaded onto the shaft.  Possibly with some Loctite or similar.  The base method here is to grab the back of the shaft with a vise or perhaps a drill chuck and then unscrew the fan.  For metal parts heat is applied to loosen any Loctite.  Here there may be some appropriate solvent, but I don't have any recommendations.

3.  A collet.  A tapered slotted cone with a hole down the center is pulled up into an external cone forcing the tapered cone to squeeze the shaft tightly.  I don't see any real evidence of this type of attachment in your pictures, but there might be some clever variant, something that might work by driving the pin visible in the center down into the core.  You can get a better view since you can twist and turn the part to see what might be going on.

If you have a friend who is a dentist you might be able to talk him into using his X-ray machine to get a better idea of how the fan is attached.

amyk:
It's almost certainly not threaded - there would be an obvious way of holding the shaft from rotating if it was, and motors of this size don't commonly use threaded shafts. My bet is on a press fit. The end of the fan has a convenient hole where a suitable puller's shaft can sit. You'll need a puller that grabs the hub and presses on that shaft end.

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