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Thread: Making a side stand from scratch

  1. #46
    Should Get Out More Big Pete's Avatar
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    Default Re: Making a side stand from scratch


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    Quote Originally Posted by Yorick View Post
    I do know that they design some flex into the frames to make them more rideable. So probably use different strengths in various areas.
    doesn't really work that way, pretty much all steel is the same stiffness (known as Youngs modulus) but the stress level at which they stay bent varies (ie. stronger). Quite often, to get a stiff structure it's no where near bending permanently.

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    Retired & Happy Yorick's Avatar
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    Default Re: Making a side stand from scratch

    Quote Originally Posted by Big Pete View Post
    doesn't really work that way, pretty much all steel is the same stiffness (known as Youngs modulus) but the stress level at which they stay bent varies (ie. stronger). Quite often, to get a stiff structure it's no where near bending permanently.
    MotoGP frames are ally.

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    Should Get Out More icarus1859's Avatar
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    Default Re: Making a side stand from scratch

    The side stand is not attached to a tube frame, on a Rudge the engine is a stressed member, there is a down tube from the headstock that bolts onto the front of the engine, then two steel flat plates that connect the engine/gearbox, there is a tube across the top and a Vee for the rear, but no bottom tube.

    So there will be no (or no noticable) flex from the side plate it's attached to, it must be 10mm thick plate.

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    Default Re: Making a side stand from scratch

    Quote Originally Posted by Yorick View Post
    MotoGP frames are ally.
    BPs statement applies to any metal really.

    Ally is less stiff than steel...however the amount it's less stiff by is also the amount is lighter by IYSWIM. Tis a curious quirk of virtually all metals, the stiffness to weight ratio is always the same. If you find a metal half as dense as steel it'll be half as stiff too. Pretty much the only outlier is beryllium...which is banned in F1, obstenisbly for safety.and cost reasons, but as if anyone believes that.

    Incidentally that's also the primary advantage of carbon fibre. It's stiffness to weight ratio can be significantly higher than metal.

    So why are bike frames Ally and not Steel? Well that takes a little more answering

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