I'm guessing this isn't repairable... :(
07-29-19, 10:36 AM
#26
Senior Member
@Salamandrine @gugie The size of the clamp is not the issue for TIG welding. But the alloy is. A lot of aluminum alloys used for forging from that time period are not weldable.
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07-29-19, 11:00 AM
#27
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Good idea, but if I was to (for instance), find a suitable candidate on eBay, I'd have to purchase it, test it, then quite possibly ask for a refund. That would be kind of a PITA. Even if it passed that smoke test, I might break it during installation, no matter how careful I was.
I'm not at home right now, but when I get a chance, I'll take a comparison photo of the Huret derailleur and just about any other in my parts bin. It's a beautiful piece of artwork, but looking at the hinge, it seems clear no mechanical engineer was involved in the design. Not even a seat-of-the-pants engineer.
I'm not at home right now, but when I get a chance, I'll take a comparison photo of the Huret derailleur and just about any other in my parts bin. It's a beautiful piece of artwork, but looking at the hinge, it seems clear no mechanical engineer was involved in the design. Not even a seat-of-the-pants engineer.
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07-29-19, 03:43 PM
#29
Senior Member
Not saying its worth the trouble, just wonder if this low temp aluminum welding (brazing really) rod would work. https://www.harborfreight.com/8-piec...q=aluminum+rod
Carried by HF and online vendors. Got some but haven't tried it yet. Has anyone experienced this fix?
Carried by HF and online vendors. Got some but haven't tried it yet. Has anyone experienced this fix?
07-29-19, 04:44 PM
#30
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Thanks for the responses. I imagine it was probably already cracked when I removed it and that it had only maintained its integrity out of habit. Replacements aren't unobtainium (looks like $70-$100 on eBay), but what are the odds the one I purchase is already cracked? Or that it cracks while installing it?
I grabbed a SunTour Vx from the bin, so I can keep moving forward. Kind of a shame though, as the bike was completely original. I will take a look though. Perhaps I can graft the Huret cage onto the SunTour body.
I grabbed a SunTour Vx from the bin, so I can keep moving forward. Kind of a shame though, as the bike was completely original. I will take a look though. Perhaps I can graft the Huret cage onto the SunTour body.
Last edited by ryansu; 07-30-19 at 12:22 PM.
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07-30-19, 11:49 AM
#31
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Probably cracked before you put it on - I've been able to confirm some of those failures with pre-build photos.
You're better off with the Vx. The Jubilee shifts like crap and won't look good over the small chainrings anyway. Don't try melding the two, it isn't worth it.
-Kurt
You're better off with the Vx. The Jubilee shifts like crap and won't look good over the small chainrings anyway. Don't try melding the two, it isn't worth it.
-Kurt
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07-30-19, 12:27 PM
#32
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I added a couple more pictures to the album. The first shows the difference in beefiness between the Nuovo Record and Jubilee derailleurs around the hinge.
The second offers a bit of visual evidence why Huret might have placed the hinge opposite the cage. On the cage side, I suspect it would have complicated the design of the little see-we-don't-need-to-use-a-parallelogram mechanism.
Long story short, they likely sacrificed strength for beauty.
The second offers a bit of visual evidence why Huret might have placed the hinge opposite the cage. On the cage side, I suspect it would have complicated the design of the little see-we-don't-need-to-use-a-parallelogram mechanism.
Long story short, they likely sacrificed strength for beauty.
07-31-19, 06:08 PM
#34
elcraft
Has anyone tried the "Lumi-Weld" type aluminum solder in a situation such as this? This product "sounds" like the perfect fix for this. It can be obtained at Harbor Freight and other sources. While I don't want to hijack the thread, but this seems like a possible solution.
