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emerson 6250 blades  Rate Topic 
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 Posted: Wed Jun 13th, 2018 06:51 pm
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Nathan Britt
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I have been restoring an emerson 6250 golden jubilee, and when I turned it on, it started making this horrible rattling noise. I switched the blades out with another set and it worked perfectly. Both sets of blades are exactly the same, and balanced. the only difference is that the rivets on the rattley blades are slightly looser and the blades go on the shaft much easier. Does anybody have any ideas? 

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 Posted: Wed Jun 13th, 2018 06:54 pm
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Stan Adams
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Those are really famous for the spider being loose on the hub

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 Posted: Wed Jun 13th, 2018 07:17 pm
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Nathan Britt
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It is a little loose. Does that affect the performance of the blades?

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 Posted: Wed Jun 13th, 2018 11:53 pm
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Stan Adams
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It makes them rattle & make so much noise you don't want to use it. I use a socket about the size of that roll, place the hub on something solid, then hit the socket with a hammer. It will tighten that roll where the spider & hub connect.

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 Posted: Thu Jun 14th, 2018 12:51 am
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Nathan Britt
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Thanks for the feedback! I'll try it.

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 Posted: Thu Jun 14th, 2018 05:16 pm
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Nathan Britt
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I tried tightening the roll and the rivets, but when I turned it on it still made the same rattling noise. Any other thoughts?

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 Posted: Mon Jun 18th, 2018 03:29 am
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Zachary Parr
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Could be the bearings. You need to oil it with zoom spout with no detergents. 

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 Posted: Mon Jun 18th, 2018 10:32 am
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NM Whitney Jr.
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I've got a 6250 that had the same problem. Mine was loose enough I could rotate the spider on the hub.  It didn't wobble or wiggle off axis by hand... but once you put in use, it sounded like the fan was flying apart.  So I read about the "position a socket on the roll and beat it with a hammer" approach (more artfully described by Stan, above). You must hit it HARD... REALLY HARD!  Two whacks tightened it up. I went for a third, hit the edge of my thumb, and succeeded in putting a very nice crease in a blade. Word to the wise, use a vise to hold the blade and some vice grips to hold the socket... then Proceed with Caution...

Last edited on Mon Jun 18th, 2018 10:35 am by NM Whitney Jr.

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 Posted: Mon Jun 18th, 2018 07:03 pm
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William Dunlap
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If you've got a nice vise, place the blade with the socket between the hub and jaw, tighten, then check. If still loose, tighten some more. Use some finesse. You can damage the hub with a hamfisted approach.
I have spacers, sockets, etc. that I have shaped on my lathe to fit the rolled edge of the hub.

When these don't respond to this method, I silver solder the bugger.

Cheers,
Bill

Last edited on Mon Jun 18th, 2018 07:05 pm by William Dunlap

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 Posted: Tue Jun 26th, 2018 04:51 pm
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Nathan Britt
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I tightened it more, but it still rattles. Does anyone think that the blades could be out of clock?

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 Posted: Wed Jul 11th, 2018 12:43 am
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Nathan Britt
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Could it be out of clock?

Last edited on Wed Jul 11th, 2018 12:45 am by Nathan Britt

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 Posted: Wed Jul 11th, 2018 01:05 am
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Jeff Jones
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Does the fan shake when running? Or just make the noise? Usually with out of clock it'll shake or vibrate. These do have pretty light blades but I'd still expect some shaking or vibration if it were out of clock.

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 Posted: Wed Jul 11th, 2018 01:13 am
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Nathan Britt
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Yes, it does shake and vibrate a lot.

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 Posted: Wed Jul 11th, 2018 01:19 am
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Dan Morris
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The rattle in these fans usually comes from the stem and neck that connect it to the base. 
These get worn and any vibration from the blade will cause a rattle.  Try removing the wing 
bolt and lifting the motor out of the base, then hold the fan and run it.  If there is no rattle then, 
that is your problem.

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 Posted: Wed Jul 11th, 2018 02:45 am
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Jeff Jones
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Did you check the blade alignment for each wing? If you spin it over by hand and view it from the side does 1 or more wings appear to be closer or farther from the front or back of the cage?

Or use a zip tie on the cage and hold it so it just touches the edge of one of the wings...then rotate the blade and see if all of them just touch it or if one or more is too close or too far. One or more wings out of alignment this way can cause vibration and rattling and is much more common than a wing being out of clock.  Any damage to a leading edge on any of the wings where it looks like it was stopped abruptly?

If after doing a balance that way, then it could be out of clock.

Last edited on Wed Jul 11th, 2018 02:45 am by Jeff Jones

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 Posted: Sun Jul 22nd, 2018 06:08 pm
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Nathan Britt
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I tried taking the motor out of the base and turned it on and it sounded fine. but as I said earlier, I switched the blades out with another set and it worked perfectly. I think there is something wrong with the blades which causes bad vibrations which makes the collar make racket.

Last edited on Sun Jul 22nd, 2018 06:08 pm by Nathan Britt

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