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Post by vance on Jul 9, 2020 14:46:06 GMT -8
James sent me several different types of parts. One is a complete diaphragm. It probably won't be flexible enough to seal the exhaust horn. One is a flat band, another is a band with ridges to form a groove for the clamp. The fourth is a band with a rim around the top that overhangs the flange to the inside. Unfortunately, all of them split apart at the print lines. The plastic he used is just stretchy enough to force over a thin sheet membrane, and hold tight around the flange.
I thought that the least likely part to work would be the band with the overhang. Turns out, it was the easiest and best to install over the thin sheet material I used (green strength OT stretch bands), and will probably clamp very well. But this is not yet tested. I still have to make a clamp that will fit over this assembly. Unfortunately, this one split, as well. That might not be a deal breaker on this style retainer, but James thinks it might be overcome.
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Post by james1979 on Jul 10, 2020 3:06:23 GMT -8
Sorry, guys... many irons in the fire, and had to start going back to work. Stupid incision isn't fully closed so I can't even get in the pool, but I have to go back to the office (isn't that some BS?)!
It is as Phil said, so I need to spend some quality time messing with my print settings for TPU to try to get better layer adhesion. I will also try to redesign the complete diaphragm to see if I can get better results, but I don't hold out much hope (I just don't think this is the best material choice for that).
Mark, if you send me an address I'll add you to the test dummy, er, beta-tester, list for these.
Respectfully,
James
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Post by scubalawyer on Jul 10, 2020 6:19:15 GMT -8
Mark, if you send me an address I'll add you to the test dummy, er, beta-tester, list for these. Respectfully, James Ok PM sent. Happy to help if I can.
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Post by Terry on Jul 10, 2020 15:17:06 GMT -8
I'm glad to see that things are still moving along in regards to the exhaust diaphragm; there has to be some resolution to this problem. I tried several different approaches to form inner tube material over the dowel rod mold that I made but can't say that I had any real success. It would curve over the top and down the sides OK and along both the sides and curved ends but I could never get it to take a "set" form. I tried leaving it on the form in the hot sun for a couple of days and even putting the tube material in boiling water before zip tying it to the dowel rod mold but nothing would cause the tube material to hold a set. The inner tube material I used was from either a car or truck inner tube so it was definitely thick enough; but yet seemed to have a good amount of flex to it at the top to function as it should. I'm wondering if a bicycle type inner tube material would work better. If I get some of that I'll try putting it on the dowel mold and see how that works. I am also considering putting some panty hose material on this mold and brushing on a liquid rubber to see how that might work. Has anyone ever used any liquid rubber products for this such as Flex Seal Liquid, Tool Dip, etc? It seems like any of these types of products would adhere well to panty hose fabric and also be made thick enough to reproduce one of these diaphragms. Anyway; lets keep plugging away guys; sooner or later we'll come up with something. Also one last thought. All of the posts in regards to this matter have come up under this thread: Healthways SCUBA with Hope-Page. I was wondering if there shouldn't be a separate thread ONLY FOR THIS TOPIC since there is such an amount of interest in the exhaust area of The Healthways Scuba Reg. This thread could be for information in regards to the EXHAUST DIAPHRAGM and the DUCKBILL. Just a thought.
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Post by nikeajax on Jul 10, 2020 15:38:43 GMT -8
Also one last thought. All of the posts in regards to this matter have come up under this thread: Healthways SCUBA with Hope-Page. I was wondering if there shouldn't be a separate thread ONLY FOR THIS TOPIC since there is such an amount of interest in the exhaust area of The Healthways Scuba Reg. This thread could be for information in regards to the EXHAUST DIAPHRAGM and the DUCKBILL. Just a thought. Bully, I say Bully! Capitol idea my good fellow!
Jaybird
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Post by SeaRat on Jul 10, 2020 19:22:07 GMT -8
There is a lot of information developed on a different thread, titled "Healthways Scuba with Hope-Page" which is difficult to search. So, with the suggestion of two of our folks, I'm going to attempt to copy them here. (I may have to actually move them here.)
John
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Post by Terry on Jul 10, 2020 19:40:16 GMT -8
There is a lot of information developed on a different thread, titled "Healthways Scuba with Hope-Page" which is difficult to search. So, with the suggestion of two of our folks, I'm going to attempt to copy them here. (I may have to actually move them here.) John Thank you John. Hopefully having a separate thread for this topic it will make things much easier for anyone searching for info on either of these matters or to contribute any suggestions or ideas. Now all we need is a solution for a way to reproduce both parts. Bring on your suggestions and ideas guys.
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Post by SeaRat on Jul 10, 2020 20:02:53 GMT -8
Okay, it's done! This new thread was created from the previous thread about Healthways Scuba & Hope-Page Mouthpiece, which did not have in its title the Scuba exhaust diaphragm. So let's continue both discussions in the appropriate places.
John
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Post by vance on Jul 11, 2020 8:05:28 GMT -8
Thanks, John. Moving everything to a new thread under an appropriate title was both a good idea and quite an undertaking! It gets hard to tease out a bit of information from a 12 page thread!
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Post by nikeajax on Jul 11, 2020 8:53:05 GMT -8
For those of you who don't understand how the Heathways Scuba exhaust system works here is an image I made: JB EDIT: I've reedited the image to show that the diaphragm has an open and closed position
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Post by nikeajax on Jul 19, 2020 9:08:21 GMT -8
OK, while trying to lure our new friend James even deeper into the HW abyss with some images I found what I was trying to tell y'all about with the MR-12 diaphragm: JB
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Post by vance on Jul 19, 2020 14:05:40 GMT -8
Thanks, JB. That's very much the same as the piece of Scuba main diaphragm I used. It's tough stuff, but I don't think it'll seal the exhaust horn adequately. We're homing in on the cure for the exhaust diaphragm problem, though. We're nearly there. It should be finished soon. I think this has got it: This is one of James' 3D print retainers. This one is the best of the several designs he came up with. It is very promising, but still in development due to some 3D printer problems voodoo. It is easy enough to fit it over the flange w/o the sheet slipping around and all over the place. I made a thin clamp for it which goes on the retainer before installing over the flange. Happily, the retainer wants to stay in place, so it's simple to tighten the clamp. I don't think this is going to work with the original wire clamp. You'll need a nice flat non-pinchey (heh) stainless clamp like the one in the picture for this to work. I will eventually post measurements for the clamp. The silicone sheet is very tough stuff that OTs use as resistance bands for physical therapy. The green stuff is one of, or the thickest grades. This should last forever, is very flexible and should seal very well. Email me if you'd like a piece. My daughter is an OT and she owes me .
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Post by nikeajax on Jul 19, 2020 14:23:11 GMT -8
PY, are you 100% sure it's silicone? I've had some that looks very much the same and mine degraded the way rubber does: to quote you, "Jus' sayin'..."
The Voit diaphragm is domed and pliable and works very well with the OEM wire clamp: it's not as thickeither.
JB
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Post by james1979 on Jul 19, 2020 15:05:33 GMT -8
I think this has got it: This is one of James' 3D print retainers. This one is the best of the several designs he came up with. It is very promising, but still in development due to some 3D printer problems voodoo.
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Post by james1979 on Jul 19, 2020 15:07:06 GMT -8
Well, printer is behaving better (for now anyway). I printed that same retainer ring again at a higher temp, with pretty good results. You can still separate it on the layer lines... but you have to really mean it. I think it will be fine for use, just not gratuitous abuse. Then I had me an idea... the inner opening on the exhaust horn sits about a millimeter below the outer opening (hence the factory diaphragm being slightly dished and you all having best sealing results with thinner materials). So now I am in the midst of printing one with that inner lip re-curved back into the horn. If I have it right, then resting state with no differential pressure will be the diaphragm sitting lightly on the inner horn, rather than just above. This should (if my TLAR engineering is right) result in less propensity to flood the exhaust hose head down, at the expense of a minimal increase in exhalation effort. Bear in mind, I still haven't tried a Healthways reg (of any model) in the water!
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