A warning on pipe-cutters

A warning on pipe-cutters

Post by GizmoDuc » Sat, 27 Sep 2008 21:12:27


Don't ever use them!

I usually cut down my seatposts for the unicycles...being short tends
to require me to do this quite often.

Usually I use a hacksaw and special guides that clamp on to the
seatpost.  That what my bike shop recommends.  Their advice being...if
you use a pipe cutter, be prepared to have the thing warp or flare out
on you.  Never use a pipe cutter to chop down a post.

Well, I got lazy and did just that today.  After cutting my Cromo
seat-post with a pipe cutter I filed it down.  And then stuck it into my
brand new KH36" frame.

It went in fine.

It doesn't come out.  

It's completely lodged itself inthere.  And the more I wiggle it, the
tighter it gets.

I will try to remove it with a vice tomorrow.  If not, then it's
consigned to the s***heap :(

I've seen people use pipe cutters many times, but be careful.  Filing
it doesn't necessarily correct the defect.

Ken

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A warning on pipe-cutters

Post by phil » Sat, 27 Sep 2008 21:59:35

After a particularly cheesy batch of saw blades I invested in one of
these:

[image:
http://www.germes-online.com/direct/dbimage/50254123/Angle_Grinder.jpg]

Quicker, easier, straighter, louder, more fun... :)

Phil

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A warning on pipe-cutters

Post by tomkarche » Sat, 27 Sep 2008 22:16:07

I've also had a (aluminum) seat post get stuck after cutting. It took
two people tugging at it to get it loose.

If you use a pipe cutter, make sure that any flaring is totally filed
down. I did not have this problem with cutting a steel seatpost with a
pipecutter, most likely because steel is less prone to flaring.

Angle grinders are relatively inexpensive and should leave a cleaner
(no flare) cut. Be sure to wear safety glasses.....tom

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A warning on pipe-cutters

Post by Nurse Be » Sat, 27 Sep 2008 22:20:24

Don't give up yet. If you are getting discouraged, take it toa bike
shop, they deal with these problems every day.

If you are really wanting to give it a go, consider the different
properties of the metal. An aluminum tube will expand with heat faster
than a steel tube, so start by heating the seat post tube with a hair
dryer or a heat gun (be careful). See if you can get some antisieze
lubricant down the tube, even a little will help, so drip it on, then
start wiggling.

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A warning on pipe-cutters

Post by sp4rky-m4rk » Sat, 27 Sep 2008 22:18:21

Quote:

> After a particularly cheesy batch of saw blades I invested in one of
> these:

> [image:
> http://www.germes-online.com/direct/dbimage/50254123/Angle_Grinder.jpg]

> Quicker, easier, straighter, louder, more fun... :)

> Phil

Fine for steel or cromo posts but grinders dont work so well on non
feris metals. The disks kind of clog and dont cut as well.

Buy some decent blades and do it by hand, you can get it straighter cut
with a hack saw than a grinder aswell.

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A warning on pipe-cutters

Post by rob.northcot » Sat, 27 Sep 2008 22:14:06

...but it's really easy to cut a seatpost with a hacksaw... takes about
a minute, or possibly two if you include the filing time, and***
the saw up afterwards.  What's the problem?

Anyway, I hope you manage to get it out OK Ken.  You must be able to
extract it with a vice without damaging the frame even if you have to
sacrifice the seatpost.  If you give up and decide to s***the frame,
send it to me :)

Rob

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A warning on pipe-cutters

Post by siafired » Sat, 27 Sep 2008 22:45:57

I use a pipe cutter for my seat posts now.  It does cause a little bit
at the end flare out, but i spend about 5 minutes using a file to get
rid of that little lip and then I grease it up and see how it goes in
the frame, if it is too hard to get in then I file it some more.  I have
had no issues.

Hopefully you can get it out without damaging your KH 36

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A warning on pipe-cutters

Post by phil » Sat, 27 Sep 2008 22:49:42

Quote:

> Fine for steel or cromo posts but grinders dont work so well on non
> feris metals. The disks kind of clog and dont cut as well.

It's worked perfectly well on steel and aluminium posts; it goes
through the latter like butter. The only type left is carbon, and I'm
(a) not likely to ever have one or (b) want to cut it with a normal
hacksaw either!

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A warning on pipe-cutters

Post by joemarshal » Sat, 27 Sep 2008 23:02:00

I have found this a good way to remove stuck seatposts

1) attach seat to post
2) attach wheel (+cranks+pedals) to frame
3) Stand on pedals (leaning against a wall)
4) pull up and twist seat.

The only seatpost I've ever stuck though is on my old pashley, and that
hadn't been cut at all.

My seatposts are all pipe cutter cut, except for the latest one, a
nimbus super-thick aluminium one, which was so thick I had to hacksaw it
- was a complete nightmare to cut, took me about 10 minutes.

Joe

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A warning on pipe-cutters

Post by peleschram » Sun, 28 Sep 2008 01:10:53

I always use a pipe cutter...

That must be why my current post is so hard to put in and pull out of
my frame (the new kh post/frame)...

I'll have to give filing a go. I remember last time I took the seat out
it took like 20 minutes hopping sif and pulling up on the seat, wiggling
it back and forth.

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A warning on pipe-cutters

Post by saskatchewania » Sun, 28 Sep 2008 01:44:48

I use a pipe cutter and have noticed a very slight flaring on the Cro-Mo
posts that I use. I have had no problems with a bit of filing but have
never used an aluminum post.

For unstucking a seatpost I would suggest checking out Sheldon Bown's
page '15 Ways To Unstick a Seatpost'
(http://www.sheldonbrown.com/stuck-seatposts.html).

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A warning on pipe-cutters

Post by Bond » Sun, 28 Sep 2008 01:51:14

Quote:

> Sheldon Bown's page '15 Ways To Unstick a Seatpost'
> (http://www.sheldonbrown.com/stuck-seatposts.html).

Great advice in that link there.^^^

Except for the part about Peanut Butter Sandwich's.
Always put PB on BOTH pieces of bread,
then the jelly doesn't soak through.

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A warning on pipe-cutters

Post by Fraggl » Sun, 28 Sep 2008 02:03:01

Quote:

> After a particularly cheesy batch of saw blades I invested in one of
> these:

> [image:
> http://www.germes-online.com/direct/dbimage/50254123/Angle_Grinder.jpg]

> Quicker, easier, straighter, louder, more fun... :)

> Phil

I'll second that, lol.

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A warning on pipe-cutters

Post by skrob » Sun, 28 Sep 2008 01:55:04

uhh
i have had this problem, but from the frame warping at the bottom
and/or bending ... never the seatpost...
i never had a problem w/ my steel frames unless there was a little rust
or something...
that said, last time i got my seatpost out of my DX it took a 3' long
2x4 and a curb.

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A warning on pipe-cutters

Post by uniaddic » Sun, 28 Sep 2008 02:23:57

Yeah when I had that problem I would just hold the saddle and push as
hard as I could with my legs on the crown of the frame.  That should
help.

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