stress strain of roller chain

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Subject Author Date
stress strain of roller chain Karl Townsend 06-11-2009
Posted by newshound on June 12, 2009, 6:25 pm
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> ciditad had written this in response to
> http://rittercnc.com/metalworking/stress-strain-of-roller-chain-184943-.htm
> :
> Hi Karl,
>
> Roller chains do not "stretch" under load

*Everything* stretches under load


Posted by RoyJ on June 12, 2009, 10:40 pm
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But roller chains "stretch" badly after use in a a lousy (read dirty)
environment. Seems to me Karl's application would slowly go out of
tolerance as the chain wore and "stretched)

newshound wrote:
>
>
>> ciditad had written this in response to
>> http://rittercnc.com/metalworking/stress-strain-of-roller-chain-184943-.htm
>>
>> :
>> Hi Karl,
>>
>> Roller chains do not "stretch" under load
>
> *Everything* stretches under load

Posted by RoyJ on June 12, 2009, 10:42 pm
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Seems to me a chain drive will slowly drift out of tolerance as the
chain wears. Move it x turns/links/whatever it will move a larger and
larger distance as it wears.

Karl Townsend wrote:
> I'm trying to decide how large a roller chain I need...
>
> Does anyone know of a table that shows how much each size roller chain
> stretches under increasing loads?
>
> The application is my plasma table. I'm upgrading from cable tension drive
> to roller chain.
>
> Karl
>
>

Posted by on June 13, 2009, 12:30 am
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> Seems to me a chain drive will slowly drift out of tolerance as the
> chain wears. Move it x turns/links/whatever it will move a larger and
> larger distance as it wears.

A friend who is a serious bicycle commuter told me that not only did I
need to replace my "stretched" chain, but also the sprocket sets that
had been worn-in to its out-of-spec pitch.

Posted by Grumpy on June 13, 2009, 8:18 am
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>
>> Seems to me a chain drive will slowly drift out of tolerance as the
>> chain wears. Move it x turns/links/whatever it will move a larger and
>> larger distance as it wears.
>
> A friend who is a serious bicycle commuter told me that not only did I
> need to replace my "stretched" chain, but also the sprocket sets that
> had been worn-in to its out-of-spec pitch.

Apperent stretch in roller chain is usually NOT stretch in the sideplates,
but wear in the roller/pin assembly.



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