Dehumidifier fan issue - Router Forums
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post #1 of 21 (permalink) Old 04-17-2018, 09:58 AM Thread Starter
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Default Dehumidifier fan issue

OK, so no woodworking content here..... just want to draw on the multitude of talent here. You constantly amaze me with your ideas and I'm hoping you can help.

I was doing my yearly cleaning of my dehumidifier and discovered that the plastic fan in it may have left this world for the next.

The center has (had?) a flat on it that mated up with a flat on the motor shaft. That opening is now almost completely round, and, of course, the fan just sits whilst the motor spins. Replacement is not an option.. discontinued part. Even called the manufacturer and no dice. I am going into a local supplier who has offered to look at it and see if it's "close" to another that might still be available.

Several thoughts I had. Build up the inside of the shaft hole and then file another flat? Not sure what I would use to do this... liquid plastic, jb weld, ?? Another thought would be to drill thru the fan and shaft and put a roll pin or something similar thru both.

Lastly, just scrap it and purchase a new one. It IS 23 years old after all, but it still works great and I'd much rather spend a little to repair than a lot to replace.

Brian


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or by imbeciles who really mean it.

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post #2 of 21 (permalink) Old 04-17-2018, 10:25 AM
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set screw after you epoxy the hole to size/fit...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
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post #3 of 21 (permalink) Old 04-17-2018, 10:43 AM
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The manufacturer purchased that fan from a supplier I'm betting, just like we're finding out that router makers purchase their collets. Matching the hub size and diameter might not be that hard which only leaves blade pitch as a variable which might not be that critical. If you want to try repairing it then use a metalized epoxy. JB might be one but I don't remember how well it sticks to plastic.

If possible I like to drill through hub and shaft and install a roll pin. I don't always trust a set screw unless maybe I can drill a dimple into the shaft for the point of the screw to seat in.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #4 of 21 (permalink) Old 04-17-2018, 11:14 AM
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+1 with Stick
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post #5 of 21 (permalink) Old 04-17-2018, 11:17 AM
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there's a flat spot on the shaft for the set screw...
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #6 of 21 (permalink) Old 04-17-2018, 11:48 AM Thread Starter
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Thanks for all the suggestions...

A set screw is not an option here for a couple of reasons, altho it WOULD be a great solution. Not much material to tap, and it's plastic to boot. And, the part that goes over the shaft has a split in it that allows the spring steel clamp to squeeze the fan center around the motor shaft. (it's possible that the [email protected]$$ that cleaned it last year, didn't put the clamp back in the right spot(yes, ME) but I digress) I think the set screw would only spread this split.

That's what brought me to the roll pin idea, but again, plastic... not sure how long the plastic would stand up.

Doing some searching brought me to Grainger.. they appear to have a great selection of fan blades. Just have to measure the motor shaft, looks to be 3/16", and the blade o/d.

Chuck mentioned blade pitch. Any way to determine that? This doesn't move a lot of air, so a steep pitch isn't needed, and a steeper pitch would put a heavier load on this small motor too.

Brian


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post #8 of 21 (permalink) Old 04-17-2018, 03:48 PM
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Quote:
Originally Posted by Stick486 View Post
there's a flat spot on the shaft for the set screw...
My experience with a set screw on a flat is that it can rock back and forth with inertia of stopping and starting.and doesn't work for long before something gives.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #9 of 21 (permalink) Old 04-17-2018, 03:51 PM
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Quote:
Originally Posted by BrianS View Post
Thanks for all the suggestions...

A set screw is not an option here for a couple of reasons, altho it WOULD be a great solution. Not much material to tap, and it's plastic to boot. And, the part that goes over the shaft has a split in it that allows the spring steel clamp to squeeze the fan center around the motor shaft. (it's possible that the [email protected]$$ that cleaned it last year, didn't put the clamp back in the right spot(yes, ME) but I digress) I think the set screw would only spread this split.

That's what brought me to the roll pin idea, but again, plastic... not sure how long the plastic would stand up.

Doing some searching brought me to Grainger.. they appear to have a great selection of fan blades. Just have to measure the motor shaft, looks to be 3/16", and the blade o/d.

Chuck mentioned blade pitch. Any way to determine that? This doesn't move a lot of air, so a steep pitch isn't needed, and a steeper pitch would put a heavier load on this small motor too.
One straightedge across a couple of blades and another on one blade if it's flat enough to register. That would give you an angle. I think it would have to be quite a bit different to make much difference, as in 10* or more. It sounds like you are at the point where you have to try it either way.
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post #10 of 21 (permalink) Old 04-17-2018, 05:08 PM
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A refrigeration supply shop should be able to help. The one that I go to has a hundred or more fan blades to choose from. The blade and shaft diameters are the most important. Blade pitch isn't, but the blade thickness might allow it not to fit. What the blades are made from is much less important, so a metal fan in place of plastic should be fine.

Another possibility is to mount a muffin fan in it. I fixed a refrigerator that somebody had replaced the fan in with a new bracket and a muffin fan. The owner said that It was quieter than the original, so he didn't want a replacement for it. I was called to replace the defrost timer, which I did, and left the muffin fan alone, because it seemed to be doing it's job quite well.

Charley

Central North Carolina

Last edited by CharleyL; 04-17-2018 at 05:11 PM.
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