help, broken cotter pin

[Black Sheep]

I have a slight problem that i need a hand with,

I use my bike daily to get to and from work but i've got a cotter pin that despite being stuck (and won't come out) is not holding the crank firmly.

my tried and tested method of taking it out isn't working (belting it with a hammer) so i'm open to ideas here.

also, does anyone have any cotter pins they've got tucked away in a shed anywhere that they don't want and would be willing to sell?

thanks

 

[colly]

my tried and tested method of taking it out isn't working (belting it with a hammer) so i'm open to ideas here.
thanks

Umm? Belting it with a bigger hammer?

You could try drilling through the centre of it, gradually using bigger drill bits until it is weak enough to deform. Might still be a waste of time though.

Sorry not much help that is it?

 

[Black Sheep]

Umm? Belting it with a bigger hammer?

You could try drilling through the centre of it, gradually using bigger drill bits until it is weak enough to deform. Might still be a waste of time though.

Sorry not much help that is it?

that was one idea i had

 

[peanut]

Are you supporting the crankarm when you are hitting the pin ?
Place a small 1/2" socket on a concrete wall .
Position the bike and sit the crankarm horizontally over the socket so that the pin will fall down into the socket when struck.
Now find a short 1/4" steel rod to use as a drift and give the pin a sharp smack with the hammer.

 

[Black Sheep]

I am not supporting the crank arm as i don't have anywhere I can support the bike in that way.

the pin has bent from being hit unfortunately so using a drift will no longer work.

 

[peanut]

if you do not put the arm onto a hard surface all the shock of the hammer is being absorbed by the bicycle frame and tyres . That is why the cotter is bent .

Why don't you hacksaw off the theaded part of the pin flush with the arm and then drift it out ?

Surely you have a kerb or a low wall somewhere within a mile of your house that you can push your bike to.!

Otherwise you need to improvise.

Find a couple of house bricks or a concrete building block or anything hard you can put under the arm .........

 

[Black Sheep]

if you do not put the arm onto a hard surface all the shock of the hammer is being absorbed by the bicycle frame and tyres . That is why the cotter is bent .

Why don't you hacksaw off the theaded part of the pin flush with the arm and then drift it out ?

Surely you have a kerb or a low wall somewhere within a mile of your house that you can push your bike to.!

Otherwise you need to improvise.

Find a couple of house bricks or a concrete building block or anything hard you can put under the arm .........

cheers, i'll give that a go later