Not sure if this could help with design of 3-D printed Kort nozzel:<br />
<br />
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 <a href="http://www.livescience.com/27012-urinary-system.html" target="_blank">the male urethra </a> 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). <br />
<br />
couldn't resist<br />
<br />
Brian<br />
<br />
-----Original Message-----<br />
From: "hank pronk" <hanker_20032000@yahoo.ca><br />
Sent 11/12/2013 5:27:18 AM<br />
To: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org><br />
Subject: Re: [PSUBS-MAILIST] Printed Kort Nozzle<br />
<br />
<div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt">
<div><span>Alan,</span></div>
<div><span>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.</span></div>
<div><span>Hank</span></div>
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<div dir="ltr"> <font face="Arial" size="2"> On Monday, November 11, 2013 8:43:53 PM, Alan James <alanlindsayjames@yahoo.com> wrote:<br />
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<div><span>Looks good Hank,</span></div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;"><span>has only 0.01 shrinkage. So if shrinkage were an issue it may be an option.</span></div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;"><span>You could probably mix glass fiber with it to strengthen it.</span></div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
font-size: 18.88px; font-style: normal; background-color: transparent;"><span>Here is an epoxy product that is not quite half the price & has the fiber mixed in it.</span></div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;"><a href="http://www.ebay.com/itm/EPOXY-RESIN-VERY-HARD-CASTING-RESIN-LIQUID-FIBERGLASS-/310112944078?pt=LH_DefaultDomain_0&hash=item48342bffce" target="_blank" rel="nofollow" shape="rect">http://www.ebay.com/itm/EPOXY-RESIN-VERY-HARD-CASTING-RESIN-LIQUID-FIBERGLASS-/310112944078?pt=LH_DefaultDomain_0&hash=item48342bffce</a><br clear="none" />
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<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;">It is a gel like consistency so
may not suit every application. Has 0.1
shrinkage.</div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;">Again if I just use the resin + glass fiber, I can mix to my desired consistency.</div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;">Another thought that came to mind was to pour a mold release in to the printed shell</div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;">& drain it out so as to leave a film on the inside. Then pour in the resin & peel off the</div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica
Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;">printed outside when set. This would leave a fiberglass product that could be attached with </div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;">epoxy to other structures.</div>
<div style="color: #000000; font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 18.88px; font-style: normal; background-color: transparent;">Alan</div>
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<font face="Arial" size="2"> <strong><span style="font-weight: bold;">From:</span></strong> hank pronk <hanker_20032000@yahoo.ca><br clear="none" />
<strong><span style="font-weight: bold;">To:</span></strong> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none" />
<strong><span style="font-weight: bold;">Sent:</span></strong> <br clear="none" />
<strong><span style="font-weight: bold;">Subject:</span></strong> Re: [PSUBS-MAILIST] Printed Kort Nozzle<br clear="none" />
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<div><span>Alan,</span></div>
<div><span>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. </span></div>
<div><span>Hank </span></div>
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<div dir="ltr"> <font face="Arial" size="2"> On Monday, November 11, 2013 6:03:27 PM, Alan <alanlindsayjames@yahoo.com> wrote:<br clear="none" />
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<div>Hi Hank,</div>
<div>I'm not familiar with liquid plastic.</div>
<div>I use the West systems epoxy, where you have your epoxy & hardener & throw</div>
<div>In the other additives that give it various properties, like
hardness. </div>
<div>The glass fibre will give it a lot of structural strength & I can mix it in as thick or</div>
<div>as thin as I want depending on the section thickness / complexity of the form I want to fill.</div>
<div>Also price wise, mixing seems a lot cheaper than off the shelf pre-mixed items.</div>
<div>Alan<br clear="none" />
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Sent from my iPad</div>
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On 12/11/2013, at 1:30 PM, hank pronk <<a href="mailto:hanker_20032000@yahoo.ca" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>> wrote:<br clear="none" />
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<div><span>Alan,</span></div>
<div><span>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.</span></div>
<div><span>Hank</span></div>
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<div dir="ltr"> <font face="Arial" size="2"> On Monday, November 11, 2013 5:26:33 PM, Alan James
<<a href="mailto:alanlindsayjames@yahoo.com" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> wrote:<br clear="none" />
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<div>To interested parties,</div>
<div>I spoke with a 3d printing expert, Richard, regarding filling hollow sections of 3d printed items with</div>
<div>fiber reinforced resin. He hadn't heard of it, but thought it had a lot of potential.</div>
<div>He suggested watching out for heat generated in the exothermic reaction, as we had already</div>
<div>discussed, and printing a roughened interior surface as a key <span style="font-size: 14pt;">for the epoxy, to stop the
exterior </span></div>
<div style="color: #000000; font-family: HelveticaNeue,;"><span style="font-size: 14pt;">delaminating.</span></div>
<div>I also
spoke to an epoxy tech who told me epoxy
only shrinks about 1/2% & with additives such as</div>
<div>milled fiber the percentile shrinkage of the whole will decrease proportionate to the additive.</div>
<div>So shrinkage may not be a major problem.</div>
<div>Will do some experimenting.</div>
<div>Alan</div>
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