[PSUBS-MAILIST] Printed Kort Nozzle

[brian]

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 NozzleAlan,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=item48342bffceIt 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 theprinted outside when set. This would leave a fiberglass product that could be attached with epoxy to other structures.AlanFrom: hank pronk <hanker_20032000 at yahoo.ca>To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> Sent:Subject: Re: [PSUBS-MAILIST] Printed Kort NozzleAlan,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 & throwIn 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 oras 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 withfiber 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 alreadydiscussed, 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 asmilled 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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