stress strain of roller chain

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Subject Author Date
stress strain of roller chain Karl Townsend 06-11-2009
Posted by Wes on June 11, 2009, 11:59 pm
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>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
>


www.brecoflex.com

I was moving an heavy injection head between 2 presses over 22 ft via belt drive
using
their product. You can get a timing belt any length you desire. Give it a look.

As far as chain, about anything will do, plasma isn't that fast, head is not
that heavy.

Wes

Posted by Steve Lusardi on June 12, 2009, 9:09 am
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Karl,
There are many, many different chain types for any given size and each have
their own use parameters. I use www.ustsubaki.com for my chain solutions.
Here is a tip, never use keyed sprockets for bi-directional loads, as the
keyways will eventually loosen. Tsubaki markets sprockets with compression
(friction) drive hubs and they are brilliant. Another tip, metric and US
standard chain sizes are practically interchangable and that fact is never
stated anywhere.
Steve

> 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 wolfgang on June 12, 2009, 9:56 am
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> Karl,
> There are many, many different chain types for any given size and each ha=
ve
> their own use parameters. I usewww.ustsubaki.comfor my chain solutions.
> Here is a tip, never use keyed sprockets for bi-directional loads, as the
> keyways will eventually loosen. Tsubaki markets sprockets with compressio=
n
> (friction) drive hubs and they are brilliant. Another tip, metric and US
> standard chain sizes are practically interchangable and that fact is neve=
r
> stated anywhere.
> Steve
>
>
>
> > 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 dr=
ive
> > to roller chain.
>
> > Karl


Karl,

Machinerys Handbook is your friend for this information... I use this
info, with appropriate safety factor, for certifying assembly line
lifts in automotive plants.

Just be aware that chains introduce some pulsing into the linear
motion.

As was pointed out above you can get wire reinforced timing belting in
straight and practically unlimited lengths. You might want to compare
costs between chain and belt.

Wolfgang

Posted by Grumpy on June 13, 2009, 8:15 am
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> Karl,
> There are many, many different chain types for any given size and each
> have their own use parameters. I use www.ustsubaki.com for my chain
> solutions. Here is a tip, never use keyed sprockets for bi-directional
> loads, as the keyways will eventually loosen. Tsubaki markets sprockets
> with compression (friction) drive hubs and they are brilliant. Another
> tip, metric and US standard chain sizes are practically interchangable and
> that fact is never stated anywhere.
> Steve
>
>> 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

Just call up the nearest chain supplier and ask them the question.
They will have a set of specifications as long as your arm.
Some of the details will be of no value to you but a simple stress vs strain
would be somewhere near the top of the sheet



Posted by ciditad on June 12, 2009, 4:27 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 - the "elongation" is called
wear.
What happens to the chain is the pins inside each of the chain link's
bushing
gets worn as time go on with each revolution of the chain around the
sprockets
and loses material, and that's why you see "stretching" or "elongation".
Chains
are not supposed to stretch like rubber, and if your chain stretched then
it's
not made with the proper material.

As for chain sizes, I suggest going to Diamond Chain's website:

http://www.diamondchain.com/

Under the "Product Support" tab, you can choose to download a very useful
program that will help you identify the proper size chain for your
application.

-------------------------------------
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







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