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Water Proof Shaft Seal

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lellasone

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#1
Hi All,

I was wondering if anyone has some good resources (or thoughts) on how to seal a small spinning shaft. My current thought is to try to make a small stuffing box with an 1/8" layer of grease between two sealed ball bearings, but since I've never done anything like this I figured I'd reach out and see if that's reasonable.

All the best,
Jake
 

lellasone

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#4
Can't believe I forgot to say what I was sealing against, in this case water. Less than a meter deep, but it's got to run submerged.

Thanks for the replies. It didn't even occur to me to check Micmaster, but of course they have something for exactly this.

I'll take a look at that PDF.
 

extropic

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#6
What horse power is involved? More precisely, how much friction can you handle from the seal?
Shaft diameter?
RPM?
 

magicniner

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#7
Mechanical Seal.
It's what they use on automotive water pumps, commonly a Viton seal running against a ceramic surface.
 

hermetic

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#8
the best water pump seals are usually carbon face seals. Most commercial water pump use them
 

Downunder Bob

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#10
Hi All,

I was wondering if anyone has some good resources (or thoughts) on how to seal a small spinning shaft. My current thought is to try to make a small stuffing box with an 1/8" layer of grease between two sealed ball bearings, but since I've never done anything like this I figured I'd reach out and see if that's reasonable.

All the best,
Jake
For a proper response we need to know more about the application, shaft size, rpm, hp, salt water/ fresh water,depth of water or head, duty cycle,
 

tq60

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#11
If running underwater the seal can be of many options that are dependent on rpm and pressure...but forget about the seal for a moment.

Material selection more important now as different materials act differently dependent on chemistry.

Once all of the materials are determined next is fit and bearings as the shaft needs to run true and not have much end play.

Last then is determining what style of seal that will meet the rpm needs and fit in the part.

Sent from my SAMSUNG-SGH-I337Z using Tapatalk
 

David S

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#12
I am not sure what you are trying to make / do, however you could buy one of the very inexpensive small submersible boat bilge pumps and see what they do.

David
 

Downunder Bob

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#13
I am not sure what you are trying to make / do, however you could buy one of the very inexpensive small submersible boat bilge pumps and see what they do.

David
Some of these small pumps use a magnetic drive so there is no shaft to seal, not sure if that's option this case.
 

Cobra

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#14
All of the bilge pumps for small boats I have seen sit in the bilge with a float switch and pump to an outlet above the water line.
 

Shootymacshootface

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#15
Outboard motors use 2 oil seals installed back to back , one to keep oil in and one to keep water out. It is simple cheap and it works.
 

epanzella

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#16
Just look up the prop shaft seals on outboard engines. They're cheap and are designed to do just what you're doing.
 

Downwindtracker2

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#18
On my old small blue band Mercs, they are single seals but of a deeper ,more robust construction. I thought of using commonly available ones but went with the proper ones.
 
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