Snapped spindle

[fossyant]

My bike chain went rusty. Then my whole bicycle fell apart.


It was a chain reaction.

 

[classic33]

My bike chain went rusty. Then my whole bicycle fell apart.


It was a chain reaction.

Watch that Ross of blood to the head.

 

[fossyant]

Watch that Ross of blood to the head.

To my 'hammer' head ?

 

[classic33]

To my 'hammer' head ?

You could always do a Jimmy Young.

 

[roubaixtuesday]

My bike chain went rusty. Then my whole bicycle fell apart.


It was a chain reaction.

I'm getting tyred of these puns

 

[fossyant]

You could always do a Jimmy Young.

Very good.. had to google !

 

[fossyant]

I'm getting tyred of these puns

Take a brake !

 

[EckyH]

You denied the reserve over the max expected,

Wrong.

I wrote that the approach "know the amplitude, add a safety reserve, done" leads to failures.
The page that you cited explains that, too.

E.

 

[silva]

I suspect, the gears on my bike are no good.​

Of late, they have been very shifty.

Go fixed and slam the door shut behind you.
What I did, 8 years ago.
On average, 2 bikes, every half year swap to other due to worn and awaiting repair, it was about 250-300 euro annually.
Now, it's replacing the chain myself, cost motorcycle chain Regina 420 20 euro a piece, early 2020, just before the lockdown economical sabotage.
I bought then 3, as test, and since test result OK, in october, a further 20 at same price.
They now cost 29 euro, so my hampstering before the sabotage results avoided 207 euro shifting out my wallet.

 

[roubaixtuesday]

Take a brake !

You're starting to sound like a crank

 

[fossyant]

You're starting to sound like a crank

I creak and groan quite a bit like silva's bike.

 

[roubaixtuesday]

I creak and groan quite a bit like silva's bike.

You seem to be bearing up quite well TBH

 

[fossyant]

Go fixed and slam the door shut behind you.
What I did, 8 years ago.
On average, 2 bikes, every half year swap to other due to worn and awaiting repair, it was about 250-300 euro annually.
Now, it's replacing the chain myself, cost motorcycle chain Regina 420 20 euro a piece, early 2020, just before the lockdown economical sabotage.
I bought then 3, as test, and since test result OK, in october, a further 20 at same price.
They now cost 29 euro, so my hampstering before the sabotage results avoided 207 euro shifting out my wallet.

Been fixed for commuting. You are singlespeed aren't you, not fixed ?

 

[classic33]

Go fixed and slam the door shut behind you.
What I did, 8 years ago.
On average, 2 bikes, every half year swap to other due to worn and awaiting repair, it was about 250-300 euro annually.
Now, it's replacing the chain myself, cost motorcycle chain Regina 420 20 euro a piece, early 2020, just before the lockdown economical sabotage.
I bought then 3, as test, and since test result OK, in october, a further 20 at same price.
They now cost 29 euro, so my hampstering before the sabotage results avoided 207 euro shifting out my wallet.

Ask yourself this question.
Is it a saving weight experiment, that was heaped upon cyclists, when they designed the cottered crankset and bearing setup?
They removed a fair bit of excess material in between the bearing surfaces. Why if the strength would be compromised, did they do that?

You keep harping on about how your cost saving experiments are effective. You chose to use a chain not suited to a bicycle drivetrain on a bicycle. When the experiment does fail, as it will, will you be able to come back and let us know. If you're lucky you may be, and if you're really lucky there'll be no-one but yourself hurt.

 

[silva]

Wrong.

I wrote that the approach "know the amplitude, add a safety reserve, done" leads to failures.
The page that you cited explains that, too.

E.

Then repeat for you:
https://machiningpartner.com/demystifying-strength-of-materials-for-engineers/

Members often undergo superimposed normal bending stresses, transverse shear stresses, axial loads, and torsional stresses simultaneously at a given point. This requires evaluating principal stresses and making suitable strength comparisons to determine an adequate margin of safety against failure or excessive deformation.

It just says what I said: a safety margin against failure.
As calculations showed earlier in this thread: Shimano could design their axles wall 50% thicker towards the inside, which would make it 29% more resisting to torsion forces, at a weight "penalty" of 20 grammes. OH NO I WON'T KEEP UP WITH THE REST THEY WILL MOCK ME.