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Hey NP, Tacky O-rings, sounds like a title for a scary movie. ;)' A steering wheel cover type gasket is a interesting option. I made the O-ring groove sides perpendicular to the conical face, partly because I thought the interior diameter wall would be angled in enough to act just like the angled interior walls used on many of are hatch O-ring grooves. I just made up the O-ring and it's groove, so I'll want to adjust them to match a existing O-ring. One might wish to seat the O-ring in Sekaflex to keep it in place. Or if one falls out and there are two in the plunger then it should still seal. At any rate I will be able to surface and easily exit my sub if one or both of my MBT's fail completely, by using my inflatable pontoons, and/or draining my VBT and releasing my drop weight. You can see the angle of the interior O-ring groove wall in these pictures, but I can see it might not be enough. Seems like I've heard of a good O-ring lubricant, but it's not coming to mind. http://cid-5085d10eb6afe47c.skydrive.live.com/self.aspx/Plunger%20Assembly/Plunger%20Assembly%20Exploded%20Side%20View%20Dimensions%20Solid.jpg?sa=316708661 http://cid-5085d10eb6afe47c.skydrive.live.com/self.aspx/Mushroom%20Vent%20Concept%20Main%20Assembly/1%20Closed%20Cut.jpg Szybowski From: nomdae@hotmail.com To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] Mushroom Vent CAD Assembly Options Date: Sat, 10 Jan 2009 14:41:07 +0000 Hey Brent! As always, your cad drawings and animation are fantastic, but I do have a concern about the O-Ring. What's to keep it from dislodging from it's groove? My concern would be that the O-Ring would become tacky and "stick" to the upper ring after prolonged periods of contact. This could partially (or completely) pull it out of it's groove and prevent the valve from sealing when it's closed again. Unfortunately, I don't have a suggestion to solve this, other than possibly some kind of gasket that would wrap around the lower assembly rim. (Like a steering wheel cover fits around a steering wheel.) Thanks for posting, NP From: brenthartwig@hotmail.com To: personal_submersibles@psubs.org Subject: [PSUBS-MAILIST] Mushroom Vent CAD Assembly Options Date: Fri, 9 Jan 2009 17:35:54 -0800 Greetings SMMOMs, I've been working on a number of different ways to configure my version of a Mushroom vent for the front and rear MBT's on my K-250. This is the one I like the best so far. http://cid-5085d10eb6afe47c.skydrive.live.com/browse.aspx/Plunger%20Assembly http://cid-5085d10eb6afe47c.skydrive.live.com/browse.aspx/Mushroom%20Vent%20Concept%20Main%20Assembly It's mostly made up of 1/4" X 1" 316 SS bar stock, and 1" thick black UHMW. So the goal is for it to be easy and affordable to make and assemble. I made a mock up of the single line, spring loaded pneumatic cylinder Vance was talking about, which I would like to use in this assembly. I will need to trim away some material on the plunger land, and the piece cut out when I made the whole in the FRP MBT, that meets the bottom of the FRP MBT, and then attach them with Seka flex and SS screws. This way I can have a clean look on the top area of the MBT's, and the angle I have to mount the vent on aids in letting almost all the air out. The very small air pockets left I'm thinking will not be an issue. I thought mounting the vent this way would be better for my application, since the knuckle curvature of the heads and the high point of the MBT's are in the same area. I'm interested in your guys thoughts on this concept design. I've uploaded three screen capture clips of the assembly animated on Youtube. The quality is not that great on Youtube, so if anyone would like better quality versions of these clips, let me know off list and I'll send them to you. http://www.youtube.com/watch?v=YvIc3qRRgv8&feature=channel_page http://www.youtube.com/watch?v=S6D0iMgqgzk&feature=channel http://www.youtube.com/watch?v=tdBap4iVoGQ&feature=channel Regards, Szybowski Windows Live™ Hotmail®: Chat. Store. Share. Do more with mail. See how it works. |
