I am a frame builder AMA

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RabiCycle

@Hulsroy 's Condor is making me do this...

(This is so nice...)

I would like to do something similar to an old 531 Raleigh frame that I have. First action would be to braze canti studs on the seat stays and move the seat stay bridge up to get clearance for 32s.

I have a metal workshop at work that I can use for making the canti studs fit nicely, but the part that is new to me is the brazing (really want to learn this).

From what I understand, the easiest way to get into this would be a MAPP gas torch and silver solder.

My question is, would this be strong enough for the canti mounts?

I am thinking about this:

https://www.amazon.co.uk/Profire-Bottle-Disposable-Cylinder-plumbers/dp/B07D5Z7JRT/ref=asc_df_B07D5Z7JRT/?tag=googshopuk-21&linkCode=df0&hvadid=310135442117&hvpos=&hvnetw=g&hvrand=393475781599789051&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1006886&hvtargid=pla-700336005838&psc=1

and this:

https://www.ebay.co.uk/itm/175533730559?hash=item28dea02aff:g:AwoAAOSwbWZaXNwz&amdata=enc%3AAQAHAAAAoBrsW5L0cJl2UM4pa5Ct9HOI8ihKIX7%2Bsn2n8AzviJ5OCyg0AGKoxn4SQrJqpqpb62wvyASyuRzZsSZEYmEKx7CKWySuQyE0ZIruuOqH86AwO0jkNu6tbPuF0ow%2Bv8gXaBjP3oivA0M0jSj63oOVgMg4oCOIiGJ0a5qGiVtaGKyVUb6%2BtMxk8dz1OvgnjN5URlYDwSI4E7wKLUQ42WNCLzw%3D%7Ctkp%3ABk9SR6bC3b-zYQ

Would this get me going?

Any input much appreciated! Thanks in advance!!

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Hulsroy in reply to @RabiCycle

Hi

I think you might get away with that setup. I've only done bottle bosses with mapp before but that worked. I don't know if you can get the bosses and seatstays hot enough quick enough to melt the silver. But only one way to find out really.
Two things: make sure the fit is good on the studs to frame and make sure the steel material (frame and braze ons) are hot enough to allow the silver to flow out on that material. Meaning to let the flame melt the silver! That way you'll get a good strong bond.
I'd probably always weld or fillet braze brake bosses, but it might be fine with silver really.

Edit: is it not cheaper to just let your local builder do the brazing and then maybe just do the fit up?

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RabiCycle in reply to @Hulsroy

Thanks for your answer, you make amazing bikes :)

If I actually needed this bike I would probably let a pro do it, but I don't, so I won't... this is mostly an experiment.

What do you mean by "let the flame melt the steel"? I would have thought you try to get the steel hot so that the steel melts the silver, and not the flame melts the silver? Did I get this totally wrong?

Cheers!

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