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RE: [PSUBS-MAILIST] Through Hulls Complete?
I mostly pot the shaft after assembly to avoid twisting the wires at the
motor. I've noticed that even good spade connectors can get hot (and waste
power) Soldering hidden connections (like where the rod joins the motor
wire) and using buss bars or screw type connectors for accessible
connections seem to work well.
I know that you've already made the shafts, but a turned shoulder for a stop
using larger diameter stock might be cleaner than a welded stop. The DEVCON
epoxies and guns with self mixing tips are really handy.
Looking forward to seeing your finished project!
Greg
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of James Frankland
Sent: Tuesday, July 28, 2009 11:13 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Through Hulls Complete?
Hi Greg.
Thanks for your advice. I had not considered filling the epoxy with the
shaft screwed in. I was going to make a plastic spacer to hold the
conductors in place at the handle end and block the hole. Pour the epoxy in
and just hold it in place until it went off. Then screw the thing together
with epoxy sealant. Spade terminals to connect the cables.
However, your idea might be better as it would help to seal the threads and
fill the last bit of threaded motor pod also with epoxy. I'll have another
think about it when i take it all appart again to do it.
Many thanks
James
----- Original Message -----
From: Greg Cottrell [mailto:greg@precisionplastics.com]
To: personal_submersibles@psubs.org
Sent: Tue, 28 Jul 2009 09:39:41 -0400
Subject: RE: [PSUBS-MAILIST] Through Hulls Complete?
James,
That looks like excellent work. The epoxy will adhere fine as long as the
surfaces are cleaned well. Also, check the resistance on the conductors to
make sure they don't produce a lot of heat under full load. You can also get
copper rod. Also check the temperature rating for the epoxy- some types will
soften with a little heat.
I don't know what your plan is to assemble the parts but this has worked for
me- drill a small hole through the side of the stainless shaft near the
motor end. Insert the rods and wires (with spacers)into the shaft and thread
the shaft into the motor. Inject medium viscosity 2-part 3m epoxy (using a
3m epoxy gun)into the hole in the side of the shaft to form a "plug" around
the end of the rods. After the plug hardens, stand the shaft up fill with
thinner liquid epoxy.
Hope this is helpful.
Greg
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of James Frankland
Sent: Tuesday, July 28, 2009 5:41 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Through Hulls Complete?
Hi All
Have a look at my motor through hulls and let me know what you think. I
sort of made it up from a design Emile sent me, Kittredge, and me.
I wasnt really sure what i was going to do, but i got in the workshop,
started and this is what i ended up with....
http://www.guernseysubmarine.com/index_files/Page20723.htm
The main 28mm bar screws into the Minn Kota motor pods. There is 15mm bore
all the way through and then a 20mm bore at the motor end to create a "stop"
for the epoxy fill.
I intend to put 2 long 4mm brass rods all the way through and fill the
entire 20 - 15mm bore with epoxy.
There will be a washer welded on to the outside of the bar to create a stop
and a plastic washer. Also a square milled flat to attach the handle. (all
yet to complete)
Question: Do i need to score or rough up the inside of the bore to create
better adhesion for the epoxy?
And suggestions, thoughts? I'm unclear with this bit, so any comments are
welcome, even if its "thats a load of crap, do it again".
Kind regards
James
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603-529-1100
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