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  1. 22nd February 2020, 08:44 PM #16
    qwertyu
    qwertyu is offline GOLD MEMBER
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    Quote Originally Posted by BobL View Post
    yep

    sure but the op has 5” ducting/flex

    thanks
    I see. If 225mm is the ideal size for 150mm pipe, what is the deal size for 100mm pipe?

    edit: I worked it out its about 150mm
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  3. 22nd February 2020, 09:07 PM #17
    BobL
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    Radius of 100mm duct is 50mm.
    Half radius is 25mm.
    100 + 25 on one side + 25 on other = 150 mm total
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  4. 22nd February 2020, 09:36 PM #18
    jack620
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    Quote Originally Posted by BobL View Post
    The problem is getting an even enough heat which is why turning them on a lathe while heating is useful. The other way is heating them in oil (water does not get hot enough) - I've tried oil, it is decidedly messy and dangerous which is why I went for the lathe method.
    The guys that made mine use glycerine.
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  5. 22nd February 2020, 10:34 PM #19
    BobL
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    Quote Originally Posted by jack620 View Post
    The guys that made mine use glycerine.
    at least that's water soluble so clean up would be better than oil.
    Thermally it would be similar to oil.
    It would make sense if there was a need to make dozens but for just a few it's quicker to use a hot air gun and a lathe.
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