'94 explosif

[Corduroyboy]

Nevertheless, I somehow doubt whether that is what Giles_Clarkson2orm has in mind and has paid £155 for.

I guess that would depend how much experience he has with this kind of problem...

I reckon he knows what he's doing.

 

[ruger44]

Ordinary 'gasspipe' frames could bare the heat a lot better, I think :roll:

There really shouldn't be any problem, as long as the heat is applied evenly. Delicate heat-treated tubes like Reynolds 753 are silver-brazed at temperatures around 600-700°C


That is around and about the temperatures needed for melting Aluminiun, depending on the alloy.
Really, I don't speak as an 'armchair' mechanic, have had to rectify blunders from others quite a bit in my working life as a motorcycle-mechanic.
And these problems/blunders also cover blowtorch malhandlings.

The heating might not be the problem, (although when overdone the tube is destroyed) but the cooling down is.
I have seen broken (Japanese) frames, even after a silversoldering job.

 

[guybe]

Nevertheless, I somehow doubt whether that is what Giles_Clarkson2orm has in mind and has paid £155 for.

I guess that would depend how much experience he has with this kind of problem...

I reckon he knows what he's doing.

Corduroyboy, are you the new owner of this Kona?

 

[Corduroyboy]

Corduroyboy, are you the new owner of this Kona?

Sure am!

 

[Anthony]

Was in the best local LBS today and he had good news for you:

1. he has never failed to get a stuck post out of a frame and he has never had to resort to heat
2. his final solution is always to cut the post just above the frame, then saw two cuts down it and clamp the two sides together to loosen it
3. he says steel isn't such bad news, you can still saw it, it just takes longer, and in any case steel posts tend to be short - some of the most difficult ones he has had to deal with were long aluminium ones well inside the frame

 

[Anthony]

Corduroyboy, are you the new owner of this Kona?

Sure am!

"I'm a 'Craven Incrementalist' (Copyright: Anthony 13/10/08 )"

You didn't bid incrementally this time!

 

[ruger44]

Was in the best local LBS today and he had good news for you:

1. he has never failed to get a stuck post out of a frame and he has never had to resort to heat
2. his final solution is always to cut the post just above the frame, then saw two cuts down it and clamp the two sides together to loosen it
3. he says steel isn't such bad news, you can still saw it, it just takes longer, and in any case steel posts tend to be short - some of the most difficult ones he has had to deal with were long aluminium ones well inside the frame

Amen to that.

 

[Caramba Kid]

Corduroyboy, are you the new owner of this Kona?

Sure am!

Hi Giles

Guessed it was you who out bid me!
Congrats

Dave

 

[Err]

Has anyone seriously tried to melt out am Alu seatpost from a Steel frame? That's seriously one of the most idiotic things i've ever heard. It's not simply a matter fo the relative melting points: one must also consider the effect on the heat treat of the steel. You're making one huge Heat Affected Zone.

 

[Corduroyboy]

Has anyone seriously tried to melt out am Alu seatpost from a Steel frame? That's seriously one of the most idiotic things i've ever heard. It's not simply a matter fo the relative melting points: one must also consider the effect on the heat treat of the steel. You're making one huge Heat Affected Zone.

I've done it with steel-in-steel before. At a reduced temperature though Last resort, mind! If you heat up the seat tube area and cool it very quickly, the oxide bond between the inside of the seat tube and the seatpost becomes unstable and a combination of whacking the seatpost down into the frame (yes, contrary to that which common sense dictates) and a liberal helping of penetrating oil results in a 'post that can actually be removed by hand...

Needless to say, I won't be doing that with this frame.