I cracked my frame!

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Re: I cracked my frame!

Postby rkelsen » Tue Aug 04, 2009 3:48 pm

bowie wrote:yes my aerospace/plane steeeeeel...

What makes it aerospace/plane steel?
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by BNA » Tue Aug 04, 2009 3:54 pm

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Re: I cracked my frame!

Postby toolonglegs » Tue Aug 04, 2009 3:54 pm

rkelsen wrote:
bowie wrote:yes my aerospace/plane steeeeeel...

What makes it aerospace/plane steel?


They just melt some of these ....Image
Image
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Re: I cracked my frame!

Postby bowie » Tue Aug 04, 2009 3:54 pm

CRMO all the way baby :P


What makes it aerospace/plane steel?


Marketing 8)

http://en.wikipedia.org/wiki/41xx_steel

And the fact that they simply used to tool for the aviation industry
http://www.sheldonbrown.com/lambert.html
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Re: I cracked my frame!

Postby Lark2004 » Tue Aug 04, 2009 4:07 pm

JV911 wrote:
bowie wrote:my aerospace/plane steeeeeel


pretty sure most planes are...wait for it...aluminium alloy! :P


In the skin and frame, yes, but there is also a few parts made from Cr-Mo in there as well. These was actually a problem with an after market part for one type of plane, it had been made out of 4130 Cr-Mo instead of 531. (This was in an Air safty Magazine at my Dad's place a few months ago. He's an Avionics Engineer and always has aircraft magazines hanging around)
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Re: I cracked my frame!

Postby twizzle » Tue Aug 04, 2009 4:17 pm

Nobody wrote:
bowie wrote:*gloats with his 40yr old aerospace forged steal bicycle" :P
You're supposed to just state the obvious and then let them draw their own conclusion. :wink:

Was it Porche that once was quoted as saying something like the ideal race car finishes the race first then immediately fall apart?


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Re: I cracked my frame!

Postby JV911 » Tue Aug 04, 2009 4:24 pm

Lark2004 wrote:In the skin and frame, yes, but there is also a few parts made from Cr-Mo in there as well


and CF to keep all parties appeased :)
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Re: I cracked my frame!

Postby Lark2004 » Tue Aug 04, 2009 4:30 pm

have to admit..... I have got carbon on my bike now........ Three tiny little spacers under the stem...... Will my bike Implode on itself and create a hole in the space time continuum?
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Re: I cracked my frame!

Postby fitz » Tue Aug 04, 2009 4:31 pm

So getting back to the subject.....show us your crack! :oops:
Can I have some of these?
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Re: I cracked my frame!

Postby Nobody » Tue Aug 04, 2009 6:00 pm

JV911 wrote:
bowie wrote:my aerospace/plane steeeeeel


pretty sure most planes are...wait for it...aluminium alloy! :P
That's why they...wait for it...crack! :P
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Re: I cracked my frame!

Postby Nobody » Tue Aug 04, 2009 6:01 pm

toolonglegs wrote:
rkelsen wrote:
bowie wrote:yes my aerospace/plane steeeeeel...

What makes it aerospace/plane steel?


They just melt some of these ....Image
That anvil looks pretty strong TLL. You could probably hammer it all day and it wouldn't crack. :D
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Re: I cracked my frame!

Postby Nobody » Tue Aug 04, 2009 6:03 pm

Lark2004 wrote:have to admit..... I have got carbon on my bike now........ Three tiny little spacers under the stem...... Will my bike Implode on itself and create a hole in the space time continuum?
No, the steel should hold it together. :mrgreen:
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Re: I cracked my frame!

Postby im_no_pro » Tue Aug 04, 2009 6:05 pm

Nobody wrote: That anvil looks pretty strong TLL. You could probably hammer it all day and it wouldn't crack. :D


If anyone can break it....... :lol:
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Re: I cracked my frame!

Postby Chaderotti » Tue Aug 04, 2009 6:22 pm

"If it ain't go no wiggly bits it ain't CF...."
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Re: I cracked my frame!

Postby snedden9485 » Tue Aug 04, 2009 6:29 pm

Bike is off to the shop in the morning. It better be replaced or its on!!!! Hopefully i can jag a 09 frame or something. It has actually cracked in 2 places, one on the bottom of the mid tube and the other near the front bottle holes on the mid tube. They are decent cracks too, not hairline.
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Re: I cracked my frame!

Postby AUbicycles » Tue Aug 04, 2009 6:37 pm

You must have been pedaling too hard!
I am sure it will work out with the replacement.
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Re: I cracked my frame!

Postby snedden9485 » Tue Aug 04, 2009 6:52 pm

It brings me to wonder how bad trainers are on frames??? My bike has done around 10 sessons in the KK trainer. I do some sprint work in the trainer, but i would have thought if it was related to this, it would have broke in the carbon stays?

So, do turbo trainers damage alu frames or am i just unlucky? I wont be telling the LBS about the trainer though 8)
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Re: I cracked my frame!

Postby Nobody » Tue Aug 04, 2009 7:00 pm

snedden9485 wrote:It brings me to wonder how bad trainers are on frames??? My bike has done around 10 sessons in the KK trainer. I do some sprint work in the trainer, but i would have thought if it was related to this, it would have broke in the carbon stays?

So, do turbo trainers damage alu frames or am i just unlucky? I wont be telling the LBS about the trainer though 8)
According to Mr Zinn, it doesn't and he is supposed to be an authority. However TLL's experience is different. Maybe Mr Zinn is referring to a 75Kg cyclists.

Third letter down.
http://www.velonews.com/article/90568

If you're worried about it, you could always setup a cheap steel bike for the trainer like some have. I haven't had any trouble with my frame on the KK yet.
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Re: I cracked my frame!

Postby grosry » Tue Aug 04, 2009 7:17 pm

what are the main reasons for frames cracking... just becuase they do or...?
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Re: I cracked my frame!

Postby sogood » Tue Aug 04, 2009 7:27 pm

grosry wrote:what are the main reasons for frames cracking... just becuase they do or...?

Material defect, fatigue, abuse... And the list goes on.
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Re: I cracked my frame!

Postby Supe » Tue Aug 04, 2009 7:51 pm

bowie wrote:*gloats with his 40yr old aerospace forged steal bicycle" :P







*EDIT.. steeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeel* :oops:


Inappropriate moment to gloat, mate. Will you still be gloating if Sneddon isn't covered and has to wear the cost of a replacement frame?
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Re: I cracked my frame!

Postby trailgumby » Tue Aug 04, 2009 8:08 pm

Nobody wrote:
JV911 wrote:
bowie wrote:my aerospace/plane steeeeeel


pretty sure most planes are...wait for it...aluminium alloy! :P
That's why they...wait for it...crack! :P


At which point they ...wait for it... patch them with carbon fibre. :P

That's what Hawker de Havilland do at Bankstown (or did, are they still there?). What do you think holds our F-111's together?

I got a couple of test pieces from a mate who worked at HdH a few years ago to use for fabricating model race car parts. Do you think I could get a drill to put a hole in it? Nup, not even a brand new titanium-nitrided bit would touch it. Danged thing would wander all over the place, even with a drill press. The only way to get a start was to mark the spot with the tip of a pointy stone in a Dremel. That was some real tough stuff. I think the resin was boron-impregnated. Yes, I wore breating apparatus when cutting it - again, with a dremel cutoff wheel. Sawblades wouldn't touch it either. :lol:

What were we talking about? Oh yes, snedden's downtube failure. :oops:

We now resume normal transmission... :lol:
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Re: I cracked my frame!

Postby provoked » Tue Aug 04, 2009 8:21 pm

I can just sit on the fence over here, Alliance frame, Alloy AND Carbon.

Anyhow, wish ya luck snedden!
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Re: I cracked my frame!

Postby twizzle » Tue Aug 04, 2009 8:23 pm

CF's an excellent material - it's just that, driven by weight weenies, manufacturers are always trying to out-do each other by making the lightest parts. Which occasionally goes horribly wrong. It's one of those situations where there are diminishing returns, ie. removing 5% weight reduces the safety factor by significantly more. If they make 2kg CF frames, they would be unbreakable and significantly stiffer and stronger than a similar weight steel frame - but instead they go for 'compliant' and 'light'... and there are a very small percentage of frames that shatter in situations where an alloy/steel frame would simply deform.

I think it was Carroll Smith (famed motorsport engineer) who said : "The price of man in motion is the occasional collision". Holds true for bicycles as well as race cars.
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Re: I cracked my frame!

Postby Lark2004 » Tue Aug 04, 2009 9:11 pm

not mine....... but since Snedden can't show us his crack now........





Image
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Re: I cracked my frame!

Postby grosry » Tue Aug 04, 2009 10:07 pm

sogood wrote:
grosry wrote:what are the main reasons for frames cracking... just becuase they do or...?

Material defect, fatigue, abuse... And the list goes on.

dont most frames have a weight limit on the riders? cause that would help snap a frame!
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