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The Junque Drawer

Noisy air blowers


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  #11  
Old 02-01-2016, 09:35:07 PM
Vanman Vanman is offline
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Default Re: Noisy air blowers

Shaded pole motors and permanent split capacitor motors driving fans work very well on a Variac, so slowing them down is a very viable option.

But, all that was wrong with the original motors was worn bearings? How about machining some new ones out of some nice phosphor bronze? China crap will never be as good as old well made stuff.

Keith
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  #12  
Old 02-01-2016, 11:59:24 PM
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Default Re: Noisy air blowers

Coated the blower with the foil backed sticky duct insulating foam that is fairly dense. No change.
I think I'll try isolating the motor and fan from the body with some cushy grommets. The OEM stuff is a bit hard from age.

The steel shaft was worn more than the oilite bearings.
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  #13  
Old 02-02-2016, 09:44:17 AM
Big Bird Big Bird is offline
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Default Re: Noisy air blowers

Have you tried to balance the squirrel cage fan? normally they will have a small metal clip used as a balance weight.. Or try to run the motor without the squirrel cage attached.. Just to see if you can Isolate the vibration...
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  #14  
Old 02-02-2016, 11:11:23 AM
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Tom Marshall Jr. Tom Marshall Jr. is offline
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Default Re: Noisy air blowers

looking at photo 4 is that a lint build up on the inside of the fins? if so not good, cleaning mine took most of the noise away on similar units.
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  #15  
Old 02-02-2016, 11:21:48 AM
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Default Re: Noisy air blowers

I re balanced the fan and motor as an assembly which did smooth it out a bit.
What I did do that made a mondo improvement is pull it all apart again and mount the motor and fan wheel on some big gummy grommets. Made some bolt spacers on the lathe and wow, a night and day difference as the vibration isn't being transmitted to the blower housing now. Next is to swap out the motor and do the mod to the other one.

Pics of this life mission critical mod forthcoming as we all know how important it is to keep madam Queen happy. I mean am I bored or what....

Then I'll likely fettle with sound deadener to quiet the air intake noise. Knowing me I'll mess with it for four hours with no improvement, give it the finger and call the project done and simply turn up the acoustic perfume when the fireplace is going.

---------- Post added at 09:21:48 AM ---------- Previous post was at 09:19:01 AM ----------

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Originally Posted by Tom Marshall Jr. View Post
looking at photo 4 is that a lint build up on the inside of the fins? if so not good, cleaning mine took most of the noise away on similar units.

Yes. That pic is as presented with 35 years of gross crud buildup. All cleaned now.
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  #16  
Old 02-02-2016, 02:53:17 PM
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Default Re: Noisy air blowers

And the thread winner is Glenn Ayres. Soft grommets with long spacers in them is the fix for this oldstuff is bored thread of the week.

The old motors were gasketed to the blower housings and had stiff rubber which is ok for well designed motors. #2 will be bolted in and the project wrapped up within an hour or two.
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Old 02-03-2016, 04:12:55 PM
Glenn Ayers Glenn Ayers is offline
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Default Re: Noisy air blowers

Yay ... I Win .. I Win

Wait

What do I win ?

I used to have several aquariums & I ran small piston compressors for air. The steel shafts would ALWAYS wear out more than the oilite bushings. Weird

Also have an RCBS Tumbler for cleaning cartridge brass for reloading. Has Two 3/8" x 9"? steel shafts that run in nylon bushings .. that the barrel rides on. Have worn grooves in 2 sets of steel shafts ... nylon bushings were fine.

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  #18  
Old 02-03-2016, 05:41:00 PM
Big Bird Big Bird is offline
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Default Re: Noisy air blowers

Glenn you didn't read his first post..... he said he was bored and cheap.... you'll be lucky if you get one of those plastic rings out of a quarter vending machine....lol.
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Old 02-03-2016, 05:46:59 PM
Vanman Vanman is offline
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Default Re: Noisy air blowers

I was wondering how well some nice drill rod running in some carefully fitted phosphor bronze bushings would do. Probably would last longer than a plain steel shaft.

Keith
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  #20  
Old 02-05-2016, 09:49:47 AM
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Default Re: Noisy air blowers

Although with a ground diameter, drill rod has a rough surface finish and would need to be polished. These self aligning bearings for most manufacturers has gone to a non sintered powdered steel composition. Cheaper than bronze and slightly porous to allow a bit of oil flow. Key word here is cheaper not better.
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