[PSUBS-MAILIST] Printed Kort Nozzle

[Alan]

Hi Hank,
as an artist I made a number of molds out of different materials. 
Silicone was best but cost N.Z. $70- a liter.
You need to make a supporting structure to pour the silicone in to, 
then on bigger molds, an external support structure for the silicone mold. 
Some times the silicone molds need to be made in two halves.
So not always easy. I thought about doing the kort nozzle with a mold,
But it would be a huge amount of work with the mold built in several sections.
There is probably not a lot on a submarine you would want to mass produce. 
That's why I like the idea of this printing process for one offs.
Also making the objects hollow will save on printer time & material.
Alan

Sent from my iPad

On 13/11/2013, at 2:27 AM, hank pronk <hanker_20032000 at yahoo.ca> wrote:

> Alan,
> How about take the printed mould and make it smaller, then use it to make a rubber mould.  Then you can make as many pieces as the mold can handle.   Unless you have lots of space you will have trouble with thick mixes.
> Hank
> 
> 
> On Monday, November 11, 2013 8:43:53 PM, Alan James <alanlindsayjames at yahoo.com> wrote:
> Looks good Hank,
> has only 0.01 shrinkage. So if shrinkage were an issue it may be an option.
> You could probably mix glass fiber with it to strengthen it.
> Here is an epoxy product that is not quite half the price & has the fiber mixed in it.
> http://www.ebay.com/itm/EPOXY-RESIN-VERY-HARD-CASTING-RESIN-LIQUID-FIBERGLASS-/310112944078?pt=LH_DefaultDomain_0&hash=item48342bffce
> It is a gel like consistency so may not suit every application. Has 0.1 shrinkage.
> Again if I just use the resin + glass fiber, I can mix to my desired consistency.
> Another thought that came to mind was to pour a mold release in to the printed shell
> & drain it out so as to leave a film on the inside. Then pour in the resin & peel off the
> printed outside when set. This would leave a fiberglass product that could be attached with 
> epoxy to other structures.
> Alan
> 
> From: hank pronk <hanker_20032000 at yahoo.ca>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: 
> Subject: Re: [PSUBS-MAILIST] Printed Kort Nozzle
> 
> Alan,
> look at liquid plastic on e bay.  It is cheap and there is one brand that cures at 180 degrees f.  This is polyurethane casting resin.  Nice stuff but maybe not for kort nozzles.  
> Hank 
> 
> 
> On Monday, November 11, 2013 6:03:27 PM, Alan <alanlindsayjames at yahoo.com> wrote:
> Hi Hank,
> I'm not familiar with liquid plastic.
> I use the West systems epoxy, where you have your epoxy & hardener & throw
> In the other additives that give it various properties, like hardness. 
> The glass fibre will give it a lot of structural strength & I can mix it in as thick or
> as thin as I want depending on the section thickness / complexity of the form I want to fill.
> Also price wise, mixing seems a lot cheaper than off the shelf pre-mixed items.
> Alan
> 
> Sent from my iPad
> 
> On 12/11/2013, at 1:30 PM, hank pronk <hanker_20032000 at yahoo.ca> wrote:
> 
>> Alan,
>> this may be a dumb question,,, why not use liquid plastic.  The stuff I use is strong and shrinks almost nothing.  It also does not generate heat when curing.  This stuff is the harness of a hockey puck.
>> Hank
>> 
>> 
>> On Monday, November 11, 2013 5:26:33 PM, Alan James <alanlindsayjames at yahoo.com> wrote:
>> To interested parties,
>> I spoke with a 3d printing expert, Richard, regarding filling hollow sections of 3d printed items with
>> fiber reinforced resin. He hadn't heard of it, but thought it had a lot of potential.
>> He suggested watching out for heat generated in the exothermic reaction, as we had already
>> discussed, and printing a roughened interior surface as a key for the epoxy, to stop the exterior 
>> delaminating.
>> I also spoke to an epoxy tech who told me epoxy only shrinks about 1/2% & with additives such as
>> milled fiber the percentile shrinkage of the whole will decrease proportionate to the additive.
>> So shrinkage may not be a major problem.
>> Will do some experimenting.
>> Alan
>> 
>> 
>> 
>> 
>> 
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