Reasons to be crankful, part 3.

Colin Blackburn said:

Bike 1. An old hybrid partly cannibalised for the recumbent. I took the
chain ring crank off but the other one has a stripped thread on the crank.
Thus I can't use a crank extractor to remove it. One tip in a maintenance
book was to clamp the frame on its side with the crank on the underside.
Then, using a hammper and a blunt cold steel chisel, hit the eff out of it
from above. Apparently restricting the blows to close to the centre and
rotating it. This seems like it might take a lifetime.

Option 1) Depending on your bottom bracket design, remove the bracket
from the drive-side. If the non-drive side of the BB is plastic then
this is easier to remove by forceful means than removing the crank by
forceful means. Although if your hybrid is indeed "old" then it is
likely to have a metal threaded device each side 🙁

Option 2) If the crank is aluminium then take a hacksaw and sacrific
the crank in the name of the Lord Dog of the Darkside and continue to
worship the undamaged frame..

Quoted message said:

Bike 2. The old Peugeot road bike I found. On this one the plastic caps
covering the crank bolts have been smashed. Unfortunately, these caps are
the screw in type rather than the pop in ones. This means the threads are
inaccessible and there isn'y enough room to get a socket in to remove the
bolt. I dis think about melting out the plastic but I'm not sure how
effective that would be.

Option 1) Smash the cap even more and lever it out with a screwdriver.
How about a small file?

Option 2) Gouge it out with a pair of pliers.

Option 3) Bodge two holes across the diameter and near to the
circumference. Insert the two points of needle-nose pliers and use it
like a screwdriver.
--
If, as Einstein said, space is curved and occupies ten
dimensions including time; How can you be certain which
is the underneath of a ladder? And how can you be certain
you haven't already walked under one next week?
Extract teeth to reply

"Colin Blackburn" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Actually, it's parts 1 and 2 that are the problem. I am currently
stripping two old bikes back to frame and forks and I'm too crankful to
the tune of three.

Bike 1. An old hybrid partly cannibalised for the recumbent. I took the
chain ring crank off but the other one has a stripped thread on the crank.
Thus I can't use a crank extractor to remove it. One tip in a maintenance
book was to clamp the frame on its side with the crank on the underside.
Then, using a hammper and a blunt cold steel chisel, hit the eff out of it
from above. Apparently restricting the blows to close to the centre and
rotating it. This seems like it might take a lifetime.

It's certainly an idea.

Can you get the BB out? Can you sacrifice the BB (or is it one of the bits
you're after)?

One thing you can do is with your handy angle grinder chop the bb axle off
near the crank. Then you can hammer the stub of axle out in the vice (easy).

I also once built a puller.

Quoted message said:

Bike 2. The old Peugeot road bike I found. On this one the plastic caps
covering the crank bolts have been smashed. Unfortunately, these caps are
the screw in type rather than the pop in ones. This means the threads are
inaccessible and there isn'y enough room to get a socket in to remove the
bolt. I dis think about melting out the plastic but I'm not sure how
effective that would be.

Can you create a screwdriver slot?
Melt the cap and you'll fill the threads with goop, which will annoy you
come crank extractor time.
Alternatively can you just screwdriver/cold chisel smash the rest of the cap
off? You might just need to break the circle - the rest could follow.
Aha - or unscrew by tapping with a screwdriver/cold chisel in the
appropriate direction (use a little hammer).

cheers,
clive

Colin Blackburn said:

Bike 2. The old Peugeot road bike I found. On this one the plastic
caps covering the crank bolts have been smashed. Unfortunately, these
caps are the screw in type rather than the pop in ones. This means
the threads are inaccessible and there isn'y enough room to get a
socket in to remove the bolt. I dis think about melting out the
plastic but I'm not sure how effective that would be.

1) Heat might work, but risks toxic fumes and messy gunge.
2) Any form of cutting/deformation to get a nick into the ring of plastic -
sharp small screwdriver, whatever, and then yank out with pliers. Aim is to
either get something to grip or a cut through the ring of plastic to weaken
it.
3) Thin pliers applied end-on so each jaw rests into the plastic at 180
degrees, initially push straight inwards to get small indents/holes, then
rotate to unscrew ring outwards.
4) tap out slowly using a small hammer and very fine punch or scriber (or
small "not best" screwdriver) at an angle to encourage the cap remains to
unscrew.

A small solitary piece of damage in the crank extractor thread is unlikely
to prevent the extractor from working properly, so whilst its wise to avoid
damaging the thread, its not a total disaster if you do mark it.

- Nigel

--
NC - Webmaster for http://www.2mm.org.uk/
Replies to newsgroup postings to the newsgroup please.

On Mon, 8 Nov 2004 10:03:21 -0000, Clive George <[email hidden]>

Quoted message said:

Can you get the BB out? Can you sacrifice the BB (or is it one of the
bits
you're after)?

I would like to keep the BB but at the end of the day it is the frame I'm
after...

Quoted message said:

One thing you can do is with your handy angle grinder chop the bb axle
off
near the crank. Then you can hammer the stub of axle out in the vice
(easy).

....so using an angle grider is an option. If I get it off the crank arm
will be going in the bin so I'm not worried about it after the grinding.

Another option is just to leave the thing there!

Quoted message said:

Can you create a screwdriver slot?
Melt the cap and you'll fill the threads with goop, which will annoy you
come crank extractor time.

Yes, I think that will be a big problem.

Quoted message said:

Alternatively can you just screwdriver/cold chisel smash the rest of the
cap
off? You might just need to break the circle - the rest could follow.
Aha - or unscrew by tapping with a screwdriver/cold chisel in the
appropriate direction (use a little hammer).

It looks like the way, though with the experience of a damaged thread on
the other bike I don't want to smash the thread on this one. In this case
the BB was an almost certain sacrifice but now I have the bike stripped
down it seems to be in pretty good nick so I'd like to thry to keep it.

Colin

Colin Blackburn said:

Bike 1. An old hybrid partly cannibalised for the recumbent. I took the
chain ring crank off but the other one has a stripped thread on the crank.
Thus I can't use a crank extractor to remove it. One tip in a maintenance
book was to clamp the frame on its side with the crank on the underside.
Then, using a hammper and a blunt cold steel chisel, hit the eff out of it
from above. Apparently restricting the blows to close to the centre and
rotating it. This seems like it might take a lifetime.

I'd be reaching for a good hacksaw at this point. Either saw through
the crank arm at the union between it and the BB spindle, or just
straight through the BB spindle itself, if you don't need to save it.

Quoted message said:

Bike 2. The old Peugeot road bike I found. On this one the plastic caps
covering the crank bolts have been smashed. Unfortunately, these caps are
the screw in type rather than the pop in ones. This means the threads are
inaccessible and there isn'y enough room to get a socket in to remove the
bolt. I dis think about melting out the plastic but I'm not sure how
effective that would be.

Glue something to the inside of the remains? Dab of araldite on a
couple of panel pins, anything really, shouldn't need much torque to
get it moved.

--

"It is mendacious to make moral distinction between the unspeakable
brutality of terrorism and the indiscriminate carnage of war and occupation.
Both kinds of violence are unacceptable. We cannot
support one and condemn the other."

Arundhati Roy

Email address is spam trapped, to reply directly remove the beverage.

in message <[email hidden]>, Colin Blackburn

(') said:

Actually, it's parts 1 and 2 that are the problem. I am currently
stripping two old bikes back to frame and forks and I'm too crankful
to the tune of three.

Bike 1. An old hybrid partly cannibalised for the recumbent. I took
the chain ring crank off but the other one has a stripped thread on
the crank. Thus I can't use a crank extractor to remove it. One tip in
a maintenance book was to clamp the frame on its side with the crank
on the underside. Then, using a hammper and a blunt cold steel chisel,
hit the eff out of it

Is it aluminium? If so, heat it rapidly (lots of heat). Then bang it.

Quoted message said:

from above. Apparently restricting the blows to close to the centre
and
rotating it. This seems like it might take a lifetime.

Bike 2. The old Peugeot road bike I found. On this one the plastic
caps covering the crank bolts have been smashed. Unfortunately, these
caps are the screw in type rather than the pop in ones. This means the
threads are inaccessible and there isn'y enough room to get a socket
in to remove the bolt. I dis think about melting out the plastic but
I'm not sure how effective that would be.

Cut (or melt) a slot in the plastic and use an tuppeny coin to unscrew
'em.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

to err is human, to lisp divine
;; attributed to Kim Philby, oddly enough.

On 8/11/04 11:05 am, in article
[email hidden], "Simon Brooke"

Quoted message said:

in message <[email hidden]>, Colin Blackburn

(') said:

Bike 1. An old hybrid partly cannibalised for the recumbent. I took
the chain ring crank off but the other one has a stripped thread on
the crank. Thus I can't use a crank extractor to remove it. One tip in
a maintenance book was to clamp the frame on its side with the crank
on the underside. Then, using a hammper and a blunt cold steel chisel,
hit the eff out of it

Is it aluminium? If so, heat it rapidly (lots of heat). Then bang it.

If it is aluminium then you should be able to melt it off with a reasonable
blow torch. Alu should melt at around 350-500 C depending on the alloy. You
probably won't damage the steel until you get well above that.

The alternative is to rest the crank on something solid and then split it
using a cold chisel and large hammer. If this doesn't work, use a bigger
hammer.

...d

Colin Blackburn said:

Bike 2. The old Peugeot road bike I found. On this one the plastic caps
covering the crank bolts have been smashed. Unfortunately, these caps are
the screw in type rather than the pop in ones. This means the threads are
inaccessible and there isn'y enough room to get a socket in to remove the
bolt. I dis think about melting out the plastic but I'm not sure how
effective that would be.

Any tips?

Stud extractors?

--
Alex
BMW R1150GS
DIAABTCOD#3 MSWF#4 UKRMFBC#6 Ibw#35 BOB#8
http://www.team-ukrm.co.uk
Windy's "little soldier"

On 8/11/04 11:57 am, in article [email hidden],

Alex Ferrier said:

Colin Blackburn said:

Bike 2. The old Peugeot road bike I found. On this one the plastic caps
covering the crank bolts have been smashed. Unfortunately, these caps are
the screw in type rather than the pop in ones. This means the threads are
inaccessible and there isn'y enough room to get a socket in to remove the
bolt. I dis think about melting out the plastic but I'm not sure how
effective that would be.

Any tips?

Stud extractors?

That is a bit of over kill.

Screwdriver embedded in the plastic and push. Warming with a hairdryer may
help as well. The plastic should be fairly brittle or flexible. It won't be
particularly strong so should yield to the appropriate degree of persuasion.

...d

David Martin said:

Alex Ferrier said:

Colin Blackburn said:

Bike 2. The old Peugeot road bike I found. On this one the plastic caps
covering the crank bolts have been smashed. Unfortunately, these caps

are

Quoted message said:

Quoted message said:

Quoted message said:

the screw in type rather than the pop in ones. This means the threads

are

Quoted message said:

Quoted message said:

Quoted message said:

inaccessible and there isn'y enough room to get a socket in to remove

the

Quoted message said:

Quoted message said:

Quoted message said:

bolt. I dis think about melting out the plastic but I'm not sure how
effective that would be.

Any tips?

Stud extractors?

That is a bit of over kill.

Probably. I was just perusing the contents of my toolkit
(biased mainly towards motorcycle work). If he has a
set, of suitable sizes, they might do the trick.

--
Alex
BMW R1150GS
DIAABTCOD#3 MSWF#4 UKRMFBC#6 Ibw#35 BOB#8
http://www.team-ukrm.co.uk
Windy's "little soldier"

In article said:

Actually, it's parts 1 and 2 that are the problem. I am currently
stripping two old bikes back to frame and forks and I'm too crankful to
the tune of three.

Bike 1. An old hybrid partly cannibalised for the recumbent. I took the
chain ring crank off but the other one has a stripped thread on the crank.
Thus I can't use a crank extractor to remove it. One tip in a maintenance
book was to clamp the frame on its side with the crank on the underside.
Then, using a hammper and a blunt cold steel chisel, hit the eff out of it
from above. Apparently restricting the blows to close to the centre and
rotating it. This seems like it might take a lifetime.

I recently managed to get a crank with stripped thread off with a three
legged puller. Alternatively, with the chainring side off, can you get
the bottom bearing bits undone enough to get the axle out and wack the
crank separate from the frame?
(My next stage was going to be a ball-joint seperator of the sort that looks
like a two pronged fork with wedges for prongs.)

Alex Ferrier said:

David Martin said:

Alex Ferrier said:

Stud extractors?

That is a bit of over kill.

Probably. I was just perusing the contents of my toolkit
(biased mainly towards motorcycle work). If he has a
set, of suitable sizes, they might do the trick.

As I don't know what they are I assume I don't have a set!

Thanks to all for the various suggestions. Now I've finally put a decent
light in the workshop I think a couple of nights banging, sawing and
grinding are in prospect.

Colin

Colin Blackburn [email hidden] opined the following...

Quoted message said:

I think a couple of nights banging, sawing and
grinding are in prospect.

Ooo! Sir! ;-)

Jon

Colin Blackburn [email hidden] opined the following...

Quoted message said:

I think a couple of nights banging, sawing and
grinding are in prospect.

Ooo! Sir! ;-)

Jon

On Mon, 08 Nov 2004 14:14:48 -0000, "Colin Blackburn"
<[email hidden]> wrote in message
<[email hidden]>:

Quoted message said:

I think a couple of nights banging, sawing and grinding are in prospect.

In honour of the 25th anniversary of Viz, I would like to take this
opportunity to say: fnaar, fnaar.

Guy
--
May contain traces of irony. Contents liable to settle after posting.
http://www.chapmancentral.co.uk

88% of helmet statistics are made up, 65% of them at Washington University

On Wed, 10 Nov 2004 20:42:47 -0000, Jon Senior

jon_AT_restlesslemon_DOTco_DOT_uk said:

Colin Blackburn [email hidden] opined the following...

Quoted message said:

I think a couple of nights banging, sawing and
grinding are in prospect.

Ooo! Sir! ;-)

I specifically separated banging and grinding with sawing to reduce the
innuendosity.

Colin

Colin Blackburn said:

I specifically separated banging and grinding with sawing to reduce the
innuendosity.

Why bother? It was always doomed to fail! :-)

Guy
--
May contain traces of irony. Contents liable to settle after posting.
http://www.chapmancentral.co.uk

88% of helmet statistics are made up, 65% of them at Washington University