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adatesman
Mar 24, 2009, 4:48 PM
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jeremy11
Mar 24, 2009, 5:01 PM
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I am waiting with eager anticipation!
remember, the twin axle design also spreads the force out over two axles equally, and over 8 lobes instead of 4, so with 5/16" lobes, it has 2.5 times the surface area of a regular cam with 4 1/4" lobes.
(This post was edited by jeremy11 on Mar 24, 2009, 5:02 PM)
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Johnny_Fang
Mar 24, 2009, 5:15 PM
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aric--
i hope you finally got some sleep over the last couple of days, because i don't see how you could have slept at all last week.
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adatesman
Mar 24, 2009, 8:06 PM
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jeremy11
Mar 24, 2009, 8:41 PM
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adatesman wrote: Well, TSCP2.1 is now dead. Any guesses at failure mode and strength while I put together the pics, charts and video? -a.
Failure mode: Sling hole broke
Strength: 26.69821
Thanks! Glad to hear you could do it!
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adatesman
Mar 24, 2009, 9:06 PM
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jeremy11
Mar 24, 2009, 9:09 PM
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so, maybe I need to go stronger than a grade 8 bolt?
would the increased surface area (2.5 times) make it easier to slide out?
(This post was edited by jeremy11 on Mar 24, 2009, 9:13 PM)
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adatesman
Mar 24, 2009, 9:12 PM
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jeremy11
Mar 24, 2009, 9:15 PM
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adatesman wrote: Not necessarily... There's a balance to be struck between strength and ductility. Might be better to simply go with a larger bolt.
because harder metal may be nominally stronger, but is also more brittle?
I'll definitely go to 3/8" for any 9" cam shenanigans.
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adatesman
Mar 24, 2009, 11:47 PM
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rschap
Mar 25, 2009, 3:48 AM
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I was going to say the same but I was going to use 4130 Chromoly and regular hot rolled steel (forget the alloy), chromolly is 30% tougher (harder and stronger) then hot rolled and actually much less brittle. A lot of it depends on what they use to make it harder, like if they alloy it or if they temper it. Stainless steel is actually one of the worst; it’s shear strength is very low. A grade 8 bolt is one of the toughest commercial bolts.
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jeremy11
Mar 25, 2009, 3:06 PM
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The more I think about the head unit on the Flexy Lady, the more I like how it supports the axle and keeps each pair of lobes close together minimizing leverage in between the two.
Now I'm cooking up some nice innovative plans for the 2010 World Cup....
This sure is addictive. Now I need a swedging tool.
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sjnutting
Mar 25, 2009, 6:01 PM
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jeremy11 wrote: The more I think about the head unit on the Flexy Lady, the more I like how it supports the axle and keeps each pair of lobes close together minimizing leverage in between the two. Now I'm cooking up some nice innovative plans for the 2010 World Cup.... This sure is addictive. Now I need a swedging tool.
Good stuff though, Aric, thanks for testing it again. I was a bit surprised by how low it broke (it is still higher than most commercial cams are rated to, though!).
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adatesman
Apr 6, 2009, 7:24 PM
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jeremy11
Apr 7, 2009, 10:38 PM
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Keep the carnage coming!
This site has been pretty boring since the World Cup ended.
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wishiwasamonkey
Apr 9, 2009, 1:02 PM
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adatesman wrote: I think that pretty much wraps up what I was planning to retest, so unless anyone has any requests I'm moving back to breaking other stuff..... -a.
At some point I would still like to see the mank cam broken. But if it looks like too much of a pita, other broken stuff will probably be more interesting.
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rschap
Apr 15, 2009, 10:52 PM
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The Ball Nutz came in today, Thank you Trango, Rockclimbing.com, and most of all Aric for everything. Now I just need my shoulder to heal so I can try them out.
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