RE: [PSUBS-MAILIST] Through Hulls Complete?

["Greg Cottrell" <greg@precisionplastics.com>]

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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