Snapped spindle

[roubaixtuesday]

Are you from Spain?
Do you wear red clothing?

If so: I didn't expect that.

E.

NOBODY EXPECTS etc etc

 

[EckyH]

Evidence showed you did not read, or, ignored what you read.

That are baseless assumptions, not a single piece of evidence.

How do mounting bolts come into the picture when one is holding a cog against a table grinder?

One at a time.
At least I wouldn't juggle around with several pieces when a running grinder is involved.

your reading assurance is not worth a British penny Mister EckyH!

Beside the fact that this rating is a personal opinion, not the absolute truth: At the moment I prefer Eurocents.

E.

 

[silva]

That are baseless assumptions, not a single piece of evidence.

That wasn't an "assumption" - your question was already out of the question due to what I said earlier, with as evidence being my post #348 https://www.cyclechat.net/threads/snapped-spindle.309571/post-7579911
"The only problem was clearance: the chain links void the circumference of the bolt heads of the 16T cog."
... so your proposal of grinding the teeth valleys deeper = out of the question, as evidenced, Your Honorable.

One at a time.
At least I wouldn't juggle around with several pieces when a running grinder is involved.

Beside the fact that this rating is a personal opinion, not the absolute truth: At the moment I prefer Eurocents.

E.

I said a table grinder not "a running grinder".
Of course, since the workpiece (a 16T bicycle cog) weights a fraction of the tool (grinder), and thus is much easier to manipulate and target. If one would want to grind/cut a bicycle frame, a running grinder may be easier, as the bicycle parts thieves in foreign neighborhoods of nearby city do.

Feel free to make it "... not worth an eurocent Mister EckyH!"

 

[EckyH]

That wasn't an "assumption" - your question was already out of the question due to what I said earlier, with as evidence being my post #348 https://www.cyclechat.net/threads/snapped-spindle.309571/post-7579911
"The only problem was clearance: the chain links void the circumference of the bolt heads of the 16T cog."
... so your proposal of grinding the teeth valleys deeper = out of the question, as evidenced, Your Honorable.

Once more: If the bolt heads are too big then filing or grinding them down to a smaller size is just logical. Easy.

I said a table grinder not "a running grinder".

For clarification: "Running" in my post meant any type of grinder - including a table grinder - in it's state of operating, ready to grind bolt heads, sprockets, chisels, whatever.

E.

 

[silva]

Once more: If the bolt heads are too big then filing or grinding them down to a smaller size is just logical. Easy.

For clarification: "Running" in my post meant any type of grinder - including a table grinder - in it's state of operating, ready to grind bolt heads, sprockets, chisels, whatever.

E.

That's not "Logical",
That's "Short-Sighted":
- the bolt head size is required for the tool,
and,
- the tool is required for mounting/unmounting.

As it is now, the 6 bolt heads have a short section of their circumference flattened, grinded off by the chains link plates.
As long as that section doesn't become longer, it's no problem to fear. I kept an eye on it, and it doesn't.
Also to take into account, this voiding of chain and mounting bolts is only due to 16T.
If I had 17T or bigger sprockets, it would have never happened.
See https://www.velosolo.co.uk/shopdisc.html

VeloSolo 15t Disc Cog - sold out and discontinued​

Originally we did not produce a 15t Disc Cog as the bolt pattern means the chain would very slightly foul the mounting bolt heads on cogs smaller than 16t. However, by using specific countersunk style bolts with a 3mm hex key fitting there is just enough clearance to prevent this.

Important: With some chains there is still the slight possibility of minor interference with the hub mount which may cause marking to the hub (to date we have only ever had one report of this). Please be advised that the 15t may therfore be a slight compromise - please do not buy if you are unhappy with this. The 15t is not usable with our 6 bolt spacers. Please email if you would like further information or advice.

... with a worn-beyond 16T cog, this also happens.

That implicitly means that the second-life and since worn-far-beyond what bicycle parts salesmen declared as allowed, doesn't wear further, at least not to the inside. Just like happened to the chainring: further wear ceased, the outcome of my test is positive.

The bottom bracket based eccentric chain tensioner on my avatar bike reached now about 80% of its range, meaning that everything points to a yet another completed chain life on that same second-life cog.
Just like the chainring, mounted 7 years ago, surviving all the chains.

Together (both sprockets) this testing proves that Velosolo, since they focussed on singlespeed, could design / CNC their chainrings and cogs directly in that low mountains/valleys shape. Then they would last till the End of Time with no flipping work, Mister E.
Leaving the cyclist only the job and cost of replacing a chain.
Which I now arrived at.

Note: I didn't say anything that I didn't say before, but Since You Showed a Need For a Repeat, I did you that Favor.

 

[EckyH]

- the bolt head size is required for the tool,

There are tools in different sizes available, eg. chisels, hammers - even table grinders.

E.

 

[Drago]

So, my take from this thread is that...

Square taper is crap.

Hollow axles are brilliant.

Hammers and chisels can cure world hunger.

 

[roubaixtuesday]

That's not "Logical",
That's "Short-Sighted":
- the bolt head size is required for the tool,
and,
- the tool is required for mounting/unmounting.

As it is now, the 6 bolt heads have a short section of their circumference flattened, grinded off by the chains link plates.
As long as that section doesn't become longer, it's no problem to fear. I kept an eye on it, and it doesn't.
Also to take into account, this voiding of chain and mounting bolts is only due to 16T.
If I had 17T or bigger sprockets, it would have never happened.
See https://www.velosolo.co.uk/shopdisc.html

... with a worn-beyond 16T cog, this also happens.

That implicitly means that the second-life and since worn-far-beyond what bicycle parts salesmen declared as allowed, doesn't wear further, at least not to the inside. Just like happened to the chainring: further wear ceased, the outcome of my test is positive.

The bottom bracket based eccentric chain tensioner on my avatar bike reached now about 80% of its range, meaning that everything points to a yet another completed chain life on that same second-life cog.
Just like the chainring, mounted 7 years ago, surviving all the chains.

Together (both sprockets) this testing proves that Velosolo, since they focussed on singlespeed, could design / CNC their chainrings and cogs directly in that low mountains/valleys shape. Then they would last till the End of Time with no flipping work, Mister E.
Leaving the cyclist only the job and cost of replacing a chain.
Which I now arrived at.

Note: I didn't say anything that I didn't say before, but Since You Showed a Need For a Repeat, I did you that Favor.

 

[silva]

There are tools in different sizes available, eg. chisels, hammers - even table grinders.

E.

You didn't read what I quoted from the Velosolo site: for the 15T, they had to change to countersunk heads, and reduce the tool size to 3 mm, meaning easily rounded, and since sunk head, no vice option.
You are also throwing together different stories - the hammer and chisel story was to get the driveside part out of Shimano's HollowTech 2 Light Religion design, this cog story is about minimalising work and cost involved to keep a fixed gear running.
Drink less, read more?

 

[silva]

So, my take from this thread is that...

Square taper is crap.

Hollow axles are brilliant.

Hammers and chisels can cure world hunger.

That's the inverted thread, not the thread.

 

[silva]

View attachment 800705

Answers have the length that questioners need to understand.
School for Dummies.

 

[fossyant]

My other lesson learned, don't anyone let Silva near your bikes, he will destroy them. Also don't go to any of his 'dealers'.



You have been warned.

 

[EckyH]

meaning easily rounded

There are softer and harder screws and tools available.
And if the chain line is right, then there is very little lateral stress for the sprocket. Which means that the screw heads don't have to take much load to keep the sprocket in place. If tightened with the right torque and care and screws and tools with sufficient quality, then the probability to round the screw heads is marginal.

You are also throwing together different stories - the hammer and chisel story was to get the driveside part out of Shimano's HollowTech 2 Light Religion design, this cog story is about minimalising work and cost involved to keep a fixed gear running.

The OP wrote about the snapped spindle of his bike and now the story is about a former cog...
I didn't throw this different story in the thread.

Drink less

I'm teetotal for many years.

E.

 

[Drago]

That's the inverted thread, not the thread.

I was standing on my head as I dictated that to my secretary.

I was going to use my dictaphone, but she said I should use my finger like normal people.

 

[silva]

My other lesson learned, don't anyone let Silva near your bikes, he will destroy them. Also don't go to any of his 'dealers'.



You have been warned.

My chainring now runs over 7 years.
If it was "destroyed", it wouldn't have.
Rather the contrary: I upgraded it towards living that much longer.
And later on same for rear cog.
With the "upgrade" costing me a year effort to flip it regularly on its mount, then no further effort.

Having nothing to do, requires nobody, Mister EckyH.
It proved beneficial to stop doing something, in both terms of work and cost.

Also, not "my" dealers, but "anyone's" dealers, only that I became less willing to accept botched jobs and buy whatever they say to buy.