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Post by Terry on Sept 14, 2020 16:10:55 GMT -8
I tried to make another duckbill today; this time with 4 dips and it's still too firm and under use would not flutter as it should. So it will be back to the Lahboratory for more spearamintin with maybe only 2 or 3 dips next time and we'll see how that goes. I did however have some luck with the change of O-rings. This time I used the #019 size instead of the #118 and this worked much better allowing the ridge it creates on the duckbill to properly fit within the groove of the exhalation horn; so I guess that some progress was made. I'm also starting to believe that the thickness of the new duckbills can also be controlled by the speed that the mold is dipped and withdrawn from the Plasti Dip. This might turn out to be helpful on these trial runs by possibly exerting some control over the thickness of the duckbill at the business (flutter) end versus the thickness that is in the horn and possibly folded over the end of the horn. Little more food for thought. James tell me more regarding the mold you're talking about making; I'm assuming it's in reference to using the Plasti Dip to create some exhaust diaphragms. This Plasti Dip is some tough stuff and I think using it along with some type of fabric would create some great exhaust diaphragms. This type of formed diaphragm along with your diaphragm retainer and the stainless clamp that Phil has come up with sounds like a definite winning combo to me. It would be nice if we had a mold for the exhaust diaphragm that could be dipped just like the mold for the duckbill. This would work great especially if the mold also created the downward curve of diaphragm that helps push it tight against the inner exhaust horn. I'll be interested to see what you come up with.
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Post by james1979 on Sept 14, 2020 18:18:11 GMT -8
James tell me more regarding the mold you're talking about making; I'm assuming it's in reference to using the Plasti Dip to create some exhaust diaphragms. Yep, it's in regards to the Dip method... I just did a quick model of a plug (needs dimensions refined yet) that would get vapor smoothed (removing layer lines, leaves a glassy smooth finish if I get it right... melts it to hell if I screw up, lol), and then used as the positive mold like your broomstick mold. I think the recessed dome of it will make it hard to get an even dip, so I will also do one with a raised dome. The retainers would force it in any way.... so may be good either way. Too many Projects! lol
James
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Post by vance on Sept 14, 2020 19:14:39 GMT -8
Well, any apprehensions about getting the DB off the form are resolved. It rolls right off like a condom. Here' my first 3 dipper with a fold-over (to fit my slightly bigger than stock GM hoses). It works fine, but is still a bit thick? I'm going for a single dip and a 2 dipper to see how they work. It looks just like an OEM DB, but for the extra length. Good on you, Terry! I think this is the answer to another Scuba replacement part!
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Post by Terry on Sept 14, 2020 20:52:16 GMT -8
Phil you sure didn't waste any time after you picked up that Plasti Dip. Looks good and hopefully I'll get around to trying a 2 or 3 dipper tomorrow. The 4 dip was just too rigid and wouldn't allow it to function properly. Did you use an O-ring on your form when you dipped yours to create the ridge that would fit into the recess of the horn, or did you not use one. Hopefully we're near resolving another issue with the HW Scuba. James that mold looks great and could be the answer to making an improvement for another issue that has already been vastly resolved. We're getting there. Who says ya can't reinvent the wheel?
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Post by vance on Sept 15, 2020 10:53:02 GMT -8
The stuff gets a bit rigid when thoroughly dry. I need to make the flutter end thinner with a wider "lip" so it closes better. I've added some thin plastic sheet to the end of my form, hoping to get a more flexible tip that closes well. I'll post pics if it works. Got a 2 dipper drying now.
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Post by james1979 on Sept 15, 2020 11:05:41 GMT -8
Terry and Phil.... I don't know if if like you guys, or hate you! lol. I bought a can of PlastiDip on the way home from the office. Most of a Scuba is doing ok with no duckbill, but if I can get the diaphragm to work, I may trade for a couple. I'm not retired, so my work will go a bit slower! Respectfully,
James
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Post by vance on Sept 15, 2020 15:30:48 GMT -8
Huh. I was making you one, as well as a couple others. Now you're in it. It's always better to have more cooks, even though the saying says not...
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Post by james1979 on Sept 15, 2020 15:36:41 GMT -8
Huh. I was making you one, as well as a couple others. Now you're in it. It's always better to have more cooks, even though the saying says not... To clarify, I meant if I get a Diaphragm to work, I'll trade for duckbills! Regardless, I'll send you a mold if I get the mold right.
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Post by vance on Sept 15, 2020 15:38:08 GMT -8
You're on! I'm homing in on it...
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Post by Terry on Sept 15, 2020 15:55:24 GMT -8
I just rolled my 2 dipper off of the mold and it's so close to satisfaction; but not quite. The end where it flutters still needs some tweaking and I think with persistent spearaminten we'll finally achieve what we're trying to do. I think I'm going to cut a new longer and flared rubber end to insert into the slot I cut in the end of the mold and hopefully that will create a longer thin end then I need and I can then trim it as needed. If and when I get this perfected I'll send both of you guys some. I think I also need to play around with the speed that I do the dip; it appears that the slower you do it the thicker the layer.
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Post by vance on Sept 15, 2020 16:02:03 GMT -8
Yeah, I tried dipping twice right away, no waiting. It got really thick. I might want to experiment with thinning the stuff first. It needs to stick, but not get too thick.
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Post by vance on Sept 16, 2020 8:48:35 GMT -8
Even with the long thin extension, the flutter end isn't laying flat. It wants to curl open...
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Post by james1979 on Sept 16, 2020 10:58:45 GMT -8
Well, I decided to try it without vapor smoothing the form (combination proof of concept and impatient!). It's drying now with 2 quick dips, one immediately after the other. We shall see what it does!
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Post by vance on Sept 16, 2020 16:36:32 GMT -8
I think that being able to better control thickness with this stuff is key. I'd like to be able to make the flutter end thinner, and the other end thicker for the roll-over bit. This will require thinning the PlastiDip and dipping from both ends. Unfortunately, it might be hard to obtain Xyline, toluene, benzene, naptha, or ethylbenzene in CA. I'm looking.
The PlastiDip is nasty smelling stuff. You know you're shortening your lifespan by messing with it.....
It does remind me of a chocolate dipped ice cream cone, though: the most benign of all things.
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Post by nikeajax on Sept 16, 2020 16:46:26 GMT -8
Here's John's, what I refer to as the, "improved duckbill": Just in case y'all forgot about its different shape. PY, next time you're at the hardware store look at the wood filler/putty thinners and see if that has the toxins you're looking for: your list sounds familiar! JB
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