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PostPosted: Sat May 11, 2013 2:04 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4427
Location: Herts UK
... but what do you do if you have steel broken or stuck in an aluminium frame?

Useful to know about this.

If you have an aluminium frame and have stuck broken steel bolt in it, this describes how to get jiggy with (safe) chemicals and SCIENCE to dissolve it out.

And how it was done described here.


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PostPosted: Sat May 11, 2013 2:15 pm 
Old School Grand Master
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Joined: Sun Aug 21, 2011 11:57 pm
Posts: 4074
Location: Antwerp, Belgium
steel post in alu frame? Caustic soda will solve that as well. You'll need a bit more soda, but in the end you'll still have a usable post.

Joking aside, alu expands more than steel. Put the frame in an oven and it'll be easier as long as you wear something to protect your hands from the heat.


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PostPosted: Sun May 12, 2013 1:17 am 
Dirt Disciple
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Joined: Tue Nov 20, 2012 6:41 pm
Posts: 53
Location: South West
How long does an Alu seatpost take to dissolve to those on here that have tried it?

Using heat is a nice method, maybe a hairdryer would be a little easier than a cooker? :D


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PostPosted: Sun May 12, 2013 8:49 am 
retrobike rider / Gold Trader
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Joined: Sat May 09, 2009 11:46 pm
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Location: East Riding of Yorkshire
It took a couple of hours for the aluminium seat post to be completely gone when I did it, using 1kg of caustic soda dissolved in about 2ltrs of water, adding more solution periodically.


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PostPosted: Mon May 13, 2013 1:29 am 
Dirt Disciple
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Joined: Tue Nov 20, 2012 6:41 pm
Posts: 53
Location: South West
Nice, I've been mixing small amounts and so far have used around 500g or so, and its slowly doing its thing. I do find it gets pretty hot, and didn't want to risk damaging the frame but even so I'm going to try a stronger mix, thanks


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PostPosted: Mon May 13, 2013 9:35 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Sat May 09, 2009 11:46 pm
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Location: East Riding of Yorkshire
I've replied on the other thread, but it won't get hot enough to damage the frame. (But it does get hot enough to burn you, so that's another danger to be aware of).


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