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Old November 14th 03, 04:46 PM
MBS
 
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Default waterproof shaft seal?

I am trying to waterproof a small electric motor (submerged) so that
shaft will be sticking out of waterproof enclosure. Can anyone point
me to a source of water sealed bushings or bearings for this sort of
application? I have been looking all over the net and can't seem to
come up with ideas or supplies to do this. The shaft size will be =
1/4"

Thanks!
Bailey--

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Old November 14th 03, 06:25 PM
Jacques Mertens
 
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Default waterproof shaft seal?

The problem here is shaft size: it's way too small for our boats and you
will not find a shaft seal in the boating supplies field.
How about industrial supplies? Shaft seals are used in all kind of tanks.


--
Jacques
http://www.bateau.com

"MBS" wrote in message
m...
I am trying to waterproof a small electric motor (submerged) so that
shaft will be sticking out of waterproof enclosure. Can anyone point
me to a source of water sealed bushings or bearings for this sort of
application? I have been looking all over the net and can't seem to
come up with ideas or supplies to do this. The shaft size will be =
1/4"

Thanks!
Bailey--



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Old November 15th 03, 06:34 AM
BruceM
 
Posts: n/a
Default waterproof shaft seal?

Don't know which country you are in but check out your ag dealers. I reckon
they will have one to fit your purpose from one of those high pressure
chemical hand sprayers. In Australia look up Hardie.
Brumer


"Jacques Mertens" wrote in message
...
The problem here is shaft size: it's way too small for our boats and you
will not find a shaft seal in the boating supplies field.
How about industrial supplies? Shaft seals are used in all kind of tanks.


--
Jacques
http://www.bateau.com

"MBS" wrote in message
m...
I am trying to waterproof a small electric motor (submerged) so that
shaft will be sticking out of waterproof enclosure. Can anyone point
me to a source of water sealed bushings or bearings for this sort of
application? I have been looking all over the net and can't seem to
come up with ideas or supplies to do this. The shaft size will be =
1/4"

Thanks!
Bailey--





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Old November 15th 03, 08:14 AM
David Flew
 
Posts: n/a
Default waterproof shaft seal?

In my experience submerged motors ( as used in submersible pumps) are to
be avoided if at all possible. And for a one-off design, you are putting a
lot of effort into something which will ultimately be unproven and a
potential failure point. You did not say what you are trying to achieve,
power, RPM, depth of submergence, fresh or salt .... Or what you have
available by way of power sources.
Can you go to a flexible shaft and keep the motor above the water? Can you
use pneumatics or hydraulics or a water driven system? What about a
magnetic drive? These are often used on pumps for severe chemical duty to
eliminate the seal problems.
Failing that, I think you are up for an expensive mechanical seal.

David



But I'd look at other ways of doing the job if at all possible.
"BruceM" wrote in message
...
Don't know which country you are in but check out your ag dealers. I

reckon
they will have one to fit your purpose from one of those high pressure
chemical hand sprayers. In Australia look up Hardie.
Brumer


"Jacques Mertens" wrote in message
...
The problem here is shaft size: it's way too small for our boats and you
will not find a shaft seal in the boating supplies field.
How about industrial supplies? Shaft seals are used in all kind of

tanks.


--
Jacques
http://www.bateau.com

"MBS" wrote in message
m...
I am trying to waterproof a small electric motor (submerged) so that
shaft will be sticking out of waterproof enclosure. Can anyone point
me to a source of water sealed bushings or bearings for this sort of
application? I have been looking all over the net and can't seem to
come up with ideas or supplies to do this. The shaft size will be =
1/4"

Thanks!
Bailey--







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Old November 15th 03, 05:08 PM
MBS
 
Posts: n/a
Default waterproof shaft seal?

Thanks for the tips. I should have provided more detail but it will
basically be a fractional horse low depth propulsion (similar to a
trolling motor only much smaller). In taking a trolling motor apart,
the water seal looks like nothing but an "O" ring or grommet next to
the bushing. How complicated can that be? Surely there has to be
something available to accomplish this.


  #6   Report Post  
Old November 16th 03, 10:39 AM
David Flew
 
Posts: n/a
Default waterproof shaft seal?

I think it's called a trolling motor ....
DF
"MBS" wrote in message
om...
Thanks for the tips. I should have provided more detail but it will
basically be a fractional horse low depth propulsion (similar to a
trolling motor only much smaller). In taking a trolling motor apart,
the water seal looks like nothing but an "O" ring or grommet next to
the bushing. How complicated can that be? Surely there has to be
something available to accomplish this.



  #7   Report Post  
Old November 16th 03, 08:46 PM
MBS
 
Posts: n/a
Default waterproof shaft seal?

DF,
I made reference to "much smaller" than a trolling motor. How then is
this a conventional trolling motor?
  #9   Report Post  
Old November 17th 03, 08:09 AM
David Flew
 
Posts: n/a
Default waterproof shaft seal?

Sorry, missed that ...
If it's that small, I'd be looking at magnetic drive. Try looking for
magnetic drive pumps.
David
"MBS" wrote in message
om...
DF,
I made reference to "much smaller" than a trolling motor. How then is
this a conventional trolling motor?



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