<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Brian,</div><div>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. </div><div>Jim<br><br>Sent from my iPhone</div><div><br>On Nov 12, 2013, at 11:46 AM, "brian" <<a href="mailto:brian@ojaivalleybeefarm.com">brian@ojaivalleybeefarm.com</a>> wrote:<br><br></div><blockquote type="cite"><div>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>
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-----Original Message-----<br>
From: "hank pronk" <<a href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>><br>
Sent 11/12/2013 5:27:18 AM<br>
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Printed Kort Nozzle<br>
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<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 <<a href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> 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 <<a href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>><br clear="none">
<strong><span style="font-weight: bold;">To:</span></strong> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <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 <<a href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> 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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