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Thanks Alan. I think Doug would have had much better luck had he
used threaded rod instead of wire. His method is essentially what
I am looking at doing however I would use a tapered end as you
suggested as well as threaded rod for the conductors to give the
epoxy something to grip onto. Emile presented an interesting
design some time ago in which he press fit conductors through
nylon or some other solid plastic material. My bigger issue from
a DIY perspective is that I will require some machining no matter
what method I choose. The K-600 uses a smooth bore through-hull
that must be sealed on the outside face by an o-ring. See
attached photo for type of penetrator I need.<br>
<br>
<br>
On 2/6/2016 3:07 PM, Alan James via Personal_Submersibles wrote:<br>
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<div id="yui_3_16_0_1_1447461477147_2815"><span
id="yui_3_16_0_1_1447461477147_2814">Jon,</span></div>
<div id="yui_3_16_0_1_1447461477147_2815"><span>I sent this
email out last year as an idea for using castable rubber
in a electrical penetrator.</span></div>
<div id="yui_3_16_0_1_1447461477147_2815"><span>Hank is
already doing something similar minus the castable rubber.</span></div>
<div id="yui_3_16_0_1_1447461477147_2815"><span>The idea is to
buy a bronze reducer fitting of appropriate size from a
marine supplier & machine</span></div>
<div id="yui_3_16_0_1_1447461477147_2815"><span>an o-ring
grove in it. The bronze fitting Preferably has </span>a
conical reduction shape ( not shown in diagram ). The
reducer compresses the epoxy under pressure in to the narrow
area & stops it extruding through. Doug was having all
sorts of problems epoxying pins straight through a fitting
without reduction.</div>
<div id="yui_3_16_0_1_1447461477147_2815">In this iteration I
epoxy the wires & sheath in to the reducer. You could
use pins which would</div>
<div id="yui_3_16_0_1_1447461477147_2815"><span>be more in
line with G. L. as if the wires are sheared water could
run through the individual</span></div>
<div id="yui_3_16_0_1_1447461477147_2815"><span>wire sheaths,
but bend the pins. I looked closely at how my subconn
penetrators were made, & they mold a thin </span>rubber
sheath over the cable about an inch back from where it
enters the penetrator. So as</div>
<div id="yui_3_16_0_1_1447461477147_2815"><span>the wiring
sheath compresses under pressure this rubber sheath moves
with it. The drawing isn't the greatest but I can
elaborate if interested. I have a 3000 psi test cylinder
to test these but haven't got round to it.</span></div>
<div id="yui_3_16_0_1_1447461477147_2815"><span><br>
</span></div>
<div id="yui_3_16_0_1_1447461477147_2815"><span> As this has
created a lot of interest, I thought I'd follow up with a</span></div>
<div id="yui_3_16_0_1_1447461477147_2797" dir="ltr"><span
id="yui_3_16_0_1_1447461477147_2816">couple of drawings of
my through hull idea :) (Attached at bottom.)</span></div>
<div id="yui_3_16_0_1_1447461477147_2790"><span
id="yui_3_16_0_1_1447461477147_2838">I am using a common
reducer fitting to butt or key the epoxy.</span></div>
<div id="yui_3_16_0_1_1447461477147_2790"><span
id="yui_3_16_0_1_1447461477147_3353">There are standard
reducer fittings with o-rings.</span></div>
<div id="yui_3_16_0_1_1447461477147_2790"><span
id="yui_3_16_0_1_1447461477147_3334">I am going to
silicone over the outer part of the fitting & along
the</span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span
id="yui_3_16_0_1_1447461477147_3417">cable jacket. Then
mold over this with the castable rubber to </span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span>tidy
it up. </span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span
id="yui_3_16_0_1_1447461477147_3601">The theory is the
silicone will compress under pressure on to</span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span
id="yui_3_16_0_1_1447461477147_3397">the jacket (which
should itself compress), & seal the jacket better</span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span>than
just epoxy.</span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span
id="yui_3_16_0_1_1447461477147_3123">I looked at a long
video of Doug Jackson making through hulls</span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span
id="yui_3_16_0_1_1447461477147_3122">for his rov by
epoxying in brass pins. They were failing badly in most
cases.</span></div>
<div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span
id="yui_3_16_0_1_1447461477147_3121">I will never trust
epoxy again.</span></div>
<div dir="ltr" id="yui_3_16_0_1_1447461477147_3166"><a
moz-do-not-send="true"
href="https://www.youtube.com/watch?v=UDZQIDkWs4w"
id="yui_3_16_0_1_1447461477147_3159"><a class="moz-txt-link-freetext" href="https://www.youtube.com/watch?v=UDZQIDkWs4w">https://www.youtube.com/watch?v=UDZQIDkWs4w</a></a></div>
<div dir="ltr" id="yui_3_16_0_1_1447461477147_3166">Regards
Alan</div>
<div dir="ltr" id="yui_3_16_0_1_1447461477147_3166"><br>
</div>
<br>
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