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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  An old foe slain forever ***removing a stuck steel seatpost***
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Author Topic: An old foe slain forever ***removing a stuck steel seatpost***  (Read 9277 times)

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Offline oldschoolace

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The excitement of finding my vitus soon turned into despair when it became apparent the GT seatpost in it was well and truly stuck  >:(

After going through the usual gambit of oil soaking, twisting with an old stem etc i put it aside resign to the fact that one day i was going to have to take more drastic measures which would probably ruin the original chrome and possibly the whole frame as it is very light and probably not that resilient to being knocked about.
I could see the whole frame wanting to twist when i had the seatpost in a vice  :shocked:

Over christmas i had time to thing about it a bit more and made plans for a bit of home brew engineeering  :)

The first and most important bit was to carefully drill a neat hole in a block of aluminium with a 1 inch diameter on one side and a 7/8th diameter on the other with a defined step where the two met.




The other side was drilled to house 4 threaded rods





Next i drilled another block right through with a 7/8th bit and drilled and threaded 4 holes for the threaded rod





This was then drilled thought the side to accept a 6mm steel rod and mounted over the very top of the stuck post. The side holes were used as guides to drill through the post.


When assembled the whole set looked like this











Turning the nuts half a turn at a time and working my way round the jig took up the slack and with a few alarmingly loud cracks and pings the masking tape told me the good news and the post had started to move. Ten minutes later the post was out  :daumenhoch:








The block were cut as thick as they were for strength and to support the very top of the seat tube which is obviously weaker with the keyhole slot. The top of the seat tube was left unmarked (appart from the previous owners attempts to remove the tube)





A close up of the bottom block seated on the seat tube.




The hole through the seat tube hardly deformed under the pressure  :daumenhoch:





Well happy  :daumenhoch:

Could possibly post this on if anyone wants a try a bit like the rim jig, would have to come up with some more detailed instructions first though  :)
« Last Edit: January 19, 2015, 10:30 PM by oldschoolace »
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline pickle

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #1 on: January 18, 2015, 05:22 PM »
 :4_17_5: superb work there! That's amazing mate

Offline snoopy72

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #2 on: January 18, 2015, 05:24 PM »
I like that  :4_17_5: saved blisters from the old hacksaw blade trick and the risk of cutting into the frame.

« Last Edit: January 18, 2015, 05:30 PM by snoopy72 »

Offline wildon

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #3 on: January 18, 2015, 05:25 PM »
Brilliant  :coolsmiley:  :daumenhoch:  :daumenhoch:

rodriguez

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #4 on: January 18, 2015, 05:34 PM »
Brilliant   :daumenhoch:

Offline Munnyella

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #5 on: January 18, 2015, 05:37 PM »
top bodgin!! simple and effective. well done!

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Offline Dannywhac

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #6 on: January 18, 2015, 05:42 PM »
That is fookin ace Clint  :4_17_5:
"Listen. I don't care what you say. Chlamydia is a soup." (Phelps, L. 2000)

Offline chubby

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #7 on: January 18, 2015, 05:59 PM »
Not a cannon then  :-\

Marvellous bit of bodgery Clint, fookin amazes me where all these ideas come from.........


Perhaps I should stop killing my brain cells with cider n fags  :chin:
WANTED : 1" freestyle forks, uglier the better

Offline snoopy72

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #8 on: January 18, 2015, 06:02 PM »
Not a cannon then  :-\

Marvellous bit of bodgery Clint, fookin amazes me where all these ideas come from.........


Perhaps I should stop killing my brain cells with cider n fags  :chin:
Swap them for Tuna and maxi muscle before it's too late :daumenhoch:
« Last Edit: January 18, 2015, 06:04 PM by snoopy72 »

Offline Bfellows

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #9 on: January 18, 2015, 06:03 PM »
Lovely bit of tinkering  ;D i find that anything seized often responds to being "shocked" out so to speak, rather than building up a steady pressure.  Take up the slack, put it under tension, warm the frame post with a heat gun, then give it a belt.......
You always need a cheese option......

Offline chubby

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #10 on: January 18, 2015, 06:04 PM »
Not a cannon then  :-\

Marvellous bit of bodgery Clint, fookin amazes me where all these ideas come from.........


Perhaps I should stop killing my brain cells with cider n fags  :chin:
Swap it for Tuna and maxi muscle  :daumenhoch:


Think I'd rather carry on killing em snoop  :teef:
WANTED : 1" freestyle forks, uglier the better

Offline snoopy72

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #11 on: January 18, 2015, 06:06 PM »
Lovely bit of tinkering  ;D i find that anything seized often responds to being "shocked" out so to speak, rather than building up a steady pressure.  Take up the slack, put it under tension, warm the frame post with a heat gun, then give it a belt.......
I tend to buy a frame without the seat post still in it  :LolLolLolLol:
Makes me want to buy one with a stuck seat post now.
« Last Edit: January 18, 2015, 07:31 PM by snoopy72 »

Offline insectbones

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #12 on: January 18, 2015, 06:30 PM »
Brilliant idea  :daumenhoch:

Offline BMX1973

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #13 on: January 18, 2015, 07:15 PM »
Great bit of engineering.  :4_17_5:

I bet you get a few radsters wanting to borrow that.

Offline bmxband1t77

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #14 on: January 18, 2015, 11:31 PM »

TOP JOB LAD!


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griff

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #15 on: January 19, 2015, 01:27 AM »
Top bodging Clinton  :4_17_5:
I bet it couldn't shift 'Excalibur' from my silverfox though

Offline Taipan

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #16 on: January 19, 2015, 09:25 AM »
 :4_17_5:

Offline oldschoolace

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #17 on: January 19, 2015, 10:11 AM »
Top bodging Clinton  :4_17_5:
I bet it couldn't shift 'Excalibur' from my silverfox though

stick a pic up Griff, let's have a look  :daumenhoch:
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline dancetothedrummersbeat

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #18 on: January 19, 2015, 02:00 PM »
That's excellent Clint. Well done  :4_17_5:

In2bmx

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #19 on: January 19, 2015, 02:29 PM »
Awesome  :4_17_5:

Offline Jaymz

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #20 on: January 19, 2015, 06:37 PM »
Awesome as always

Offline Sid1972

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #21 on: January 19, 2015, 06:43 PM »
Awesome!! Could double a penis enlarger also.  :-\

Offline Discostu

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #22 on: January 19, 2015, 07:46 PM »
Awesome work yet again.  :4_17_5: :4_17_5: :4_17_5: :daumenhoch:

Offline nosepickben

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #23 on: January 19, 2015, 08:24 PM »
Very good work!! I like. 

Offline kalex

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Re: An old foe slain forever ***removing a stuck steel seatpost***
« Reply #24 on: January 21, 2015, 07:09 PM »
excellent job

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