waterproofing motors
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I have made many!
First, the main housing can be made from PVC tubing, one end is close by a cap
(not a screwed plug) with an internal recess of 1/2 " to be grooved to accept an
"O" ring which should be compressed of 20% of it original diametre once plugged
to the cylinder housing. For the shaft end, the drive shaft of the external
propeller
can be fitted to this side plug simply by a brass or copper bushing but must be
locked
at its outside end by a collar poprevent the shaft to go in the housing, because
i.e.
if the shaft as a diameter 1/2" then at 30 feets deep the water pressure (.433
psi for every
feet of soft water) will push oto the shaft at 2.5 pounds.
This shaft if not direcly the same shaft of the motor (most likely) might be
coupled
with a rubber shaft coupler which alloud enough misenlinement of both shaft.
Avoid
rigid coupler. The whole housing can also filled in with thin oil for very deep
uses.
Have fun!
Rene Genest
Service Camera Pro.
Quebec City
Sam a
First, the main housing can be made from PVC tubing, one end is close by a cap
(not a screwed plug) with an internal recess of 1/2 " to be grooved to accept an
"O" ring which should be compressed of 20% of it original diametre once plugged
to the cylinder housing. For the shaft end, the drive shaft of the external
propeller
can be fitted to this side plug simply by a brass or copper bushing but must be
locked
at its outside end by a collar poprevent the shaft to go in the housing, because
i.e.
if the shaft as a diameter 1/2" then at 30 feets deep the water pressure (.433
psi for every
feet of soft water) will push oto the shaft at 2.5 pounds.
This shaft if not direcly the same shaft of the motor (most likely) might be
coupled
with a rubber shaft coupler which alloud enough misenlinement of both shaft.
Avoid
rigid coupler. The whole housing can also filled in with thin oil for very deep
uses.
Have fun!
Rene Genest
Service Camera Pro.
Quebec City
Sam a
Comments
I'm sending attached files on different type of a draw I made. The hole to
receive the bushing
can be machined as tight enough to be put in place by "pressfit" and add some
epoxi glue between
the 2 surface, make the surface of the bushing rough with sand paper so the
glue will stick better.
an lock it with a final locking screw. For the caps at each ends, I made 2 draw,
1 st option is to get
the job well done by a machine shop or 2 nd option (cheaper) is to finish it
like the back cover
of a 35mm camera NIKONOS model V, (5) , Do not hesitate to ask machinist to get
a more
reliable and durable results. Electric wire can get trough cover by using
fitting connector and plug
normally used in compressed air industry, instead of the rigid plastic air hose,
you place your
electric round wire. You can secure the end cap with silicone glue or with screw
but make sure
to fit thoses screw on the external side of the "o" ring.
Good luck!
Give me back news
Rene
Sam a
Rene
Sam a
good down to 30ft? I don't want to use trolling motors (I've used
them before and they aren't very efficient or light), and I don't
want to use bilge pumps either. I've heard that one can pass the
motor shaft though a tunnel drilled in some kind of plastic, and
then put vaseline or something between the shaft and the walls of
the tunnel. Does anyone have specific information about what types
of materials to use? Good motor brands, plastic type, sealer type
(vaseline, etc), etc. A schematic or measurements would be hugely
appreciated. If one uses this method does it have to be constantly
checked after each water use, or is it pretty stable of a seal?
Thanks for any help!!
Magnetic couplings can be a pretty good way to
get power from a "wet side" to a "dry side" or
a "low pressure" to "high pressure" side without
any shaft seals to worry about.
Steve
At 03:46 PM 10/30/2003, you wrote:
>does anyone have instructions on how to waterproof a motor so it's
>good down to 30ft? I don't want to use trolling motors (I've used
>them before and they aren't very efficient or light), and I don't
>want to use bilge pumps either. I've heard that one can pass the
>motor shaft though a tunnel drilled in some kind of plastic, and
>then put vaseline or something between the shaft and the walls of
>the tunnel. Does anyone have specific information about what types
>of materials to use? Good motor brands, plastic type, sealer type
>(vaseline, etc), etc. A schematic or measurements would be hugely
>appreciated. If one uses this method does it have to be constantly
>checked after each water use, or is it pretty stable of a seal?
>Thanks for any help!!
makes sense. I have a couple questions, I have made a drawing of
what I think you are describing, I uploaded it into the 'photos'
section (it's on the second page of the photos section), it's
called 'waterproof_motor.gif'. Please download it and edit it to if
you can see anythign wrong with it. should the cap be placed at both
ends of the pvc cylinder? If not then how is the shaft end closed?
Also, are you saying that the seal between the copper bushing and
the PVC around it is good enough to prevent flooding? Is there
something wrong with my picture on the shaft side? Thanks for all
your help!
--- In basicstamps@yahoogroups.com, rene genest <rene.genest@q...>
wrote:
> I have made many!
>
> First, the main housing can be made from PVC tubing, one end is
close by a cap
> (not a screwed plug) with an internal recess of 1/2 " to be
grooved to accept an
> "O" ring which should be compressed of 20% of it original diametre
once plugged
> to the cylinder housing. For the shaft end, the drive shaft of the
external propeller
> can be fitted to this side plug simply by a brass or copper
bushing but must be locked
> at its outside end by a collar poprevent the shaft to go in the
housing, because i.e.
> if the shaft as a diameter 1/2" then at 30 feets deep the water
pressure (.433 psi for every
> feet of soft water) will push oto the shaft at 2.5 pounds.
>
> This shaft if not direcly the same shaft of the motor (most
likely) might be coupled
> with a rubber shaft coupler which alloud enough misenlinement of
both shaft. Avoid
> rigid coupler. The whole housing can also filled in with thin oil
for very deep uses.
>
> Have fun!
>
> Rene Genest
> Service Camera Pro.
> Quebec City
>
> Sam a