Help with brazing cable housing stops
 

Specifically what type of flux and filler do I need for brazing aluminum cable housing stops to a Reynold 520 Cromoly frame?
Also I am modifying a rear derailleur hanger. I am adding a small bar to the hanger to keep it properly aligned. The hanger is aluminum. Should I also use aluminum for the bar or a different metal? Then what flux and filler for the hanger?

Thanks

I will be interested in the answer to your actual questions too :) But why not just use steel cable housing stops? They're very easy to braze onto a steel frame.

Aluminum cable stop brazed to a steel frame? Didn't think this is possible.

Where can I get steel cable housing stops?

There is a pinned thread at the top of this forum that discusses frame building component suppliers. Lots of options.

There is a supplier sticky at the top of this forum.

I would consider bike fab supply or framebuildersupply
https://framebuildersupply.com/collections/braze-ons

I have a good stash of various braze on bits including cable stops in a few configurations. Feel free to PM me if I can help you out. Andy

I think you can braze aluminium to steel using something something like an aluminium bronze rod.

You can even weld aluminium to steel but only by using high explosives. Probably not a good idea to attempt this in your garage.

https://www.sciencedirect.com/scienc...24013618302899

What alloy? The melting point of aluminum bronze alloys I'm seeing is considerably higher than the melting point of aluminum alloys.

Yes you're right... You could use aluminium as a filler metal to braze the brazing rods together.

There are a couple of products for aluminium soldering. These will usually wet on steel too.

It makes no sense to do this with aluminum when steel parts are easily available. Joining dissimilar metals is always going to be an experiment best left to people that really need to do it.

And understand galvanic corrosion. Andy

Yes steel and aluminium resist all attempts to stick together when you want them to but are very good at it when you don't. The best way to attach the braze-ons might be to corrode them on :)

Just buy some steel braze ons and some 50 - 56% silver solder and the appropriate flux. I would stick with ordering the stops from Bikefabsupply or Framebuilders Supply, because NOVA will kill you on shipping for small parts.

Is that still true about Nova? In the past they would send a different way if you called, I did that once.

With Nova under new ownership you may want to call them and see if that is still the case.

As a test, I put 10 cable stops in my cart and the shipping calculator shows $16.12 to ship to NJ. I don't know if they would put them in a padded mailer and send them USPS if you call, but I have an irrational aversion to calling places to ask about stuff like that. I know Andrew at Bikefabsupply will only charge me the actual cost of shipping and refund any difference from the online shipping calculator.

I don't like it either, but I think I did it before BFS and FS showed up. Henry James was the same way. Bad postage estimators.
Of course, now companies are a bit worried about using priority mail, but my experience with Paragon and priority mail has been good.

Andrew at Bicycle Fabrication Supply has partially refunded part of the shipping costs (to reflect the actual cost) on several of my orders. That sort of honesty is very refreshing.

And what was the refund amount? Asking because I feel that some small amounts of doing business are not worth the efforts to save more on sometimes. Andy

You gotta pay someone to put the small order in a box and ship it, so I can understand why there is a floor at some companies. Don't really see it as dishonesty or honesty really

I don't recall the exact amounts. They were in the $5-10 range.

[QUOTE=guy153;21951987]I think you can braze aluminium to steel using something something like an aluminium bronze rod.

You can even weld aluminium to steel but only by using high explosives. Probably not a good idea to attempt this in your garage.

You can, but not for the home welder. You will need to use a bimetallic transition insert or coat the steel prior to welding / brazing.