Cutting a steel sea...
 

[Closed] Cutting a steel seatpost out of an aluminium frame

Posts: 23311
Full Member
Topic starter
 

Anyone done it?

How time consuming was it and how easy is it to damage the frame?

Last resort time. Chemicals and brute force aren't shifting this bugger.


 
Posted : 07/07/2011 6:04 pm
Posts: 36
Free Member
 

Ive done ally out of Ti*.

Took a while and was fiddly as ****. But worked in the end.

Used a hacksaw blade bolted into a baton of wood.
[img] [/img]

* there's actually an Al insert in the seattube on that Ti frame, so post and insert had bonded. It also meant that I had to be very carefully at the seat collar end as I couldnt rely on the hardness of Ti to shrug off any clumsy sawing strokes.


 
Posted : 07/07/2011 6:25 pm
Posts: 0
Free Member
 

Cut just above the top of the seat tube and cut down the inside of the seatpost with a hacksaw blade. Don't blame me if it all goes horribly wrong though.


 
Posted : 07/07/2011 6:26 pm
Posts: 23311
Full Member
Topic starter
 

Thanks.

I'll start it with my powered hack saw then thread up a normal one and finish it by hand.

Full susser with short seat tube.

[IMG] [/IMG]


 
Posted : 07/07/2011 6:37 pm
Posts: 0
 

Have you tried the hot air gun on the frame and ice in the seat tube approach?


 
Posted : 07/07/2011 6:39 pm
Posts: 0
Free Member
 

maybe unfasted the seat clamp first ๐Ÿ˜‰


 
Posted : 07/07/2011 6:55 pm
Posts: 23311
Full Member
Topic starter
 

Have you tried the hot air gun on the frame and ice in the seat tube approach?

Boiling water, PlusGas, enough force to break the seat clamp and swearing. None of which have shifted the bleeder.


 
Posted : 07/07/2011 7:02 pm
Posts: 10654
Full Member
 

You did try undoing the seat clamp didn't you...
๐Ÿ™‚

Just Kkidding.

Is it turning at all ?
Stilson might get it turning.


 
Posted : 07/07/2011 7:04 pm
Posts: 19
Free Member
 

Don't do it - look for some old school engineering workshop local if possible - try getting it reamed out - and you may still have a usable frame afterwards.


 
Posted : 07/07/2011 7:22 pm
Posts: 0
Free Member
 

hot air gun for more heat? You will hve to be very careful to cut it out without damage to the frame


 
Posted : 07/07/2011 8:11 pm
Posts: 23311
Full Member
Topic starter
 

Had a word with one of "the wise men" on our factory floor.

For the price of 8 cans of lager they are going to weaken the post by grinding away at it from the inside then crush it with a set of grips and pull it out. The scary looking (in an industrial dentistry sort of way) cutting tools will not come into contact with the frame.

Saves me a lot of trouble.


 
Posted : 08/07/2011 4:46 pm
Posts: 1617
Free Member
 

make sure they drink the lager afterwards ๐Ÿ˜†


 
Posted : 08/07/2011 4:52 pm