Return line caps update
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Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
Return line caps update
My dad finished machining the caps and barbs and sent them to me. These arrived today.
Everything is made of a high quality aluminum. I'm going to TIG the barbs onto the cap barrels. I definitely don't trust my own welding skills. LOL. He sent me some super fine emery cloth to polish everything nice after welding.
Everything is made of a high quality aluminum. I'm going to TIG the barbs onto the cap barrels. I definitely don't trust my own welding skills. LOL. He sent me some super fine emery cloth to polish everything nice after welding.
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Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
Do you think I should have a steel rod that fits with a tight tolerance into the caps for the welding process? At first I thought of using an old injector, but I don't think the viton o-rings would fare so well.
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
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Posting Guru
Joined: Jul 2004
Posts: 1,627
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From: West Valley Utah
I don't think those caps are going to split anytime soon. They look great. How much time does your dad have in them?
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Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
He specializes in prototyping and machines everything by hand. I'm going to revise my cad drawing to his design and it'll be ready to import into cad-cam for a cnc setup. I'm crossing my fingers to get these welded this weekend.
I installed one onto an injector that has o-rings on it. It fit great. I think these should work, but can't be sure until installed.
I installed one onto an injector that has o-rings on it. It fit great. I think these should work, but can't be sure until installed.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
I'd make a holding jig for welding the barbs in. Probably a piece of steel
-.002" of items bore, to try to elimanate any heat distortion. The next set I'd also consider an interference fit and locktite /press fit the barbs in.
-.002" of items bore, to try to elimanate any heat distortion. The next set I'd also consider an interference fit and locktite /press fit the barbs in.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
I think the slight taper pressed in with Lock Tite to seal them would be the best.
I would worry about temp changes and vibration over time causing air leaks with the liquid nitrogen method.
Nice work though.
I would worry about temp changes and vibration over time causing air leaks with the liquid nitrogen method.
Nice work though.