[PSUBS-MAILIST] Printed Kort Nozzle

Tue Nov 12 18:23:28 EST 2013

Do you think the pressure is measured by the 6 pack ?
--------------------------------------------
On Tue, 11/12/13, Jim Todd <jimtoddpsub at aol.com> wrote:

 Subject: Re: [PSUBS-MAILIST] Printed Kort Nozzle
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Date: Tuesday, November 12, 2013, 10:02 AM

 Brian,You
 didn't mention what pressure was used in the experiment.
 It might be hard to come up with empirical data, but
 there's plenty of anecdotal evidence from my generation
 on the variability.  After all these years I'm
 still trying to perfect technique. Jim

 Sent from my iPhone
 On Nov 12, 2013, at 11:46 AM, "brian" <brian at ojaivalleybeefarm.com>
 wrote:

 Not sure if this could
 help with design of 3-D printed Kort nozzel:

 Enter the  Splash Lab at Brigham Young University, where
 researchers are trying to figure  out how to prevent urinal
 splash-back. Fluid dynamics scientist Randy Hurd and  his
 graduate adviser, Tadd Truscott, created a model of the
 male urethra   on a 3-D printer — a cylinder measuring
 0.31 inches by 0.12 inches (8  millimeters by 3
 millimeters). The urethra was attached to a pressurized 
 container with tubing. The team sent a steady stream of dyed
 water through the  tubing at a urine flow rate equivalent to
 that of a middle-age man, or about 0.7  ounces per second
 (21 milliliters per second). 

 couldn't resist

 Brian

 -----Original Message-----

 From: "hank pronk" <hanker_20032000 at yahoo.ca>

 Sent 11/12/2013 5:27:18 AM

 To: "Personal Submersibles General Discussion"
 <personal_submersibles at psubs.org>

 Subject: Re: [PSUBS-MAILIST] Printed Kort Nozzle

 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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