[PSUBS-MAILIST] Printed Kort Nozzle

Sat Nov 9 11:17:14 EST 2013

The prototype was printed. I machined the final version from solid POM
/DELRIN for better reliability

A Kort nozzle on the other hand, would be extreme inefficient to machine
from solid..

Emile

  _____  

Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] 
Verzonden: zaterdag 9 november 2013 11:02
Aan: Personal Submersibles General Discussion
Onderwerp: Re: [PSUBS-MAILIST] Printed Kort Nozzle

Hi, just to show you the possibilities: 
The black part forward the eyemask, means th part were the four hoses goes
in - is a 3D print out. The diver was with it down to 260 feet.

http://www.euronaut.org/content/gfx/diving/oxydrant/DoublellopwithPeppers001
.jpg

The printer use a plastic wire with was print out hot melted. 

vbr Carsten

"Alan James" <alanlindsayjames at yahoo.com> schrieb: 

Hi Alec,

It would be a matter of putting as much fiber in with the resin that the 

form would enable. With the kort nozzle, the nozzle shape would allow

for a thick mix, but the struts might not.

A bit of experimentation would be required.

If you back lit the printed shell you may be able to see the resin as it
fills it,

& be aware of any air voids. Again with the thicker mixes you could ram rod

them down with a flexible piece of plastic rod. 

One concern is that epoxy shrinks when setting, (but not as bad polyester)

& so the shell might need to be filled in a coupe of pours to stop it
damaging the outer shell. 

Alan

  _____  

From: Private <alecsmyth at gmail.com>
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org> 
Sent: Saturday, November 9, 2013 10:23 AM
Subject: Re: [PSUBS-MAILIST] Printed Kort Nozzle

Sorry, the ones I was referring to are LONG fibers mixed with the resin.

On Nov 8, 2013, at 4:21 PM, "Smyth, Alec" <Alec.Smyth at covisint.com> wrote:

That's stuff is exactly what I meant by "structural fiberglass". You can't
pour it. However, if you made the nozzle in two halves like doughnut-shaped
dog bowls, you could fill them both up, put them together, and wipe off the
excess.

On Nov 8, 2013, at 4:17 PM, "Alan James" <alanlindsayjames at yahoo.com> wrote:

Alec / Joe,

these products "milled glass fibers" or "chopped strand glass fibers"

 may be OK, in combination with epoxy resin.

http://www.fiberglasssupply.com/Product_Catalog/Fillers/fillers.html

The more you can add, the stronger the product, but also it becomes thicker

& harder to pour in to small voids. I would be careful of using polyester
resin as it

would probably melt the printed shell.

You may be able to use a thin flexible plastic rod to stuff courser mixtures
down in to

the shell.

Alan

  _____  

From: Alan <alanlindsayjames at yahoo.com>
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org> 
Sent: Saturday, November 9, 2013 8:10 AM
Subject: Re: [PSUBS-MAILIST] Printed Kort Nozzle

Alec / Joe,

I will contact a friend who is in the 3d printing business, and try & find
out a bit more

about this application & casting materials.

You would need to incorporate risers (tubes) in the design to vent air for
the resin 

pouring process, & maybe " keys" on the inside of the mould to give the
resin more

grip to the printed shell.

Cheers Alan

Sent from my iPad

On 9/11/2013, at 12:24 AM, Alec Smyth <alecsmyth at gmail.com> wrote:

Hi Alan, 

I like this idea! I have a printer I built myself so am a little familiar
with them. One of the parameters you provide the printers on each job
controls the "filling" of the piece. Normally, to save material that is a
sort of cross-hatch, and the parameters control things like the direction
and density of that cross-hatch. But the problem with that, for an
underwater application, is that the resulting piece is full of air voids.
I'd always assumed I would print something like this solid. However, if you
print it hollow and fill it with structural fiberglass, the end result is
going to be a lot stronger than if it's solid plastic. In addition, if we
printed by parts but filled it up once those parts are assembled, the resin
itself could be the "glue" that holds those parts together.

Thanks,

Alec 

On Thu, Nov 7, 2013 at 10:01 PM, Alan James <alanlindsayjames at yahoo.com>
wrote:

Joe, 

I was re thinking your idea of a printed Kort nozzle.

There are printer kits for $900- that would do the job.

http://www.3dstuffmaker.com/

The ABS printer cable I've seen selling for about $1- an ounce.

The $899- version in the above link could possibly be big enough to print

the nozzle in one shot. If not then print it in sections & glue together.

My idea is to print the nozzle hollow with an egg shell wall thickness &
fill it with

a fiber reinforced epoxy resin. The resin may need a few pours to allow for
contractions

in the resin while setting.

Maybe under $30- in materials.

I am not at the point where I need this & neither are you, but I think this
idea still

holds a lot of promise.

Regards Alan

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Carsten Standfuß
Dipl.Ing.Schiffbau @ Meerestechnik
Heinrich Reck Str.12A
18211 Admannshagen

0172 8464 420
WWW.Euronaut.org
Carsten at euronaut.org

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