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  1. #1
    Administrator kwun's Avatar
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    Default Stainless Steel badminton string

    "string": 22 gauge 216L stainless steel wire
    racket: DHS something something memo graphite that was a gift from a friend long long time ago. the dry weight is 91grams. BP=292mm

    i tried out the string itself on the machine. it holds up until around 25lbs and then beyond that it will start stretching (plastic deformation). it snaps pretty quickly at 30lbs. i plan to string it around 21-22lbs.

    i was going to order the 21 gauge but the order for the 22 gauge which i order before wasn't cancellable. so i will see how this one work out. 21 gauge should hold up higher tension.

    the string do not stretch at all on the WISE. when it reaches the desired tension, no more tension creeping. plucking it produce a very high tone. it will be interesting how it actually plays. this is totally unchartered territory when it comes to badminton stringing.

    i will try to put up a video on the process. hopefully it will be fun. i plan to string it tonight after the kids goes to bed. stay tuned.

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  2. #2
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    This looks really interesting indeed. Do some smashing with it in the video.

    Have you thought about using piano wires? I've heard they can be as thin as 0.15 mm and hold tension at 100+ lbs.

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    Regular Member visor's Avatar
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    Even if your grommets can withstand it, I have a feeling that your shuttle is gonna get shredded to pieces!

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    Administrator kwun's Avatar
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    it is done. i didn't record how long it took. but at least 45mins and the process is super painful. the wire was stiff and not easy to handle at all. weaving is impossible as it is stiff to pull and the shiny surface provides very little friction.

    the tone that came out was pretty low. so not crispy at all as i only did it in 21lbs. i will try to hit a few tomorrow to see how it plays. should be fun.

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    Administrator kwun's Avatar
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    i took the video. expect it to be up by the end of tomorrow. it will be a busy day tomorrow.

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    Regular Member nokh88's Avatar
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    Ok. We shall wait.

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    Regular Member visor's Avatar
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    I expect it to hit like a board without much repulsion, despite the low tone and tension, because it's made of darn steel afterall!

    So, you can say that you succeeded in making a training racket!

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    Wow I can't believe you actually went ahead and did this Kwun haha. I mean I had the idea with coiling the wire around your racket but I didn't think you'd actually go as far as using it as a badminton string =p. Don't hurt yourself while doing it! Do you plan to take a quick video of yourself hitting with it as well? Just trying to do one of each shot, clear, smash, drop, net shot =p

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    Administrator kwun's Avatar
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    well. it was only $6. cheaper than some badminton string.

    the result is a bit disappointing. i haven't been to the real gym yet. but so far i have noticed a few things:

    - tension loss is really fast. i can almost hear difference on successive hit by hand
    - vibration is incredibly bad. imagine a guitar/violin string type of vibration. only now it is on the badminton racket.

    looks rather nice and impressive though. but i am afraid that's about it...

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    Regular Member nokh88's Avatar
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    Maybe you could use it as a guitar instead.

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    Very very interesting string, Kwun! Is tension loss due to the slippery surface of the stainless steel? Suspension bridges don't use knots to hold cables. Therefore, stainless steel may not work well with badminton racket at all .

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    Regular Member Mark A's Avatar
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    Is tension loss due to the slippery surface of the stainless steel?
    I thought of suggesting some adhesive on the knots, but it's a bit late now.

    There will be little tension loss in the "normal" way, especially if it behaves so much like Kevlar as kwun mentioned, so what there is will come from knot sliding and grommet/frame disintegration.

    We need teh video!!!

  13. #13
    Administrator kwun's Avatar
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    Quote Originally Posted by Pete LSD View Post
    Very very interesting string, Kwun! Is tension loss due to the slippery surface of the stainless steel? Suspension bridges don't use knots to hold cables. Therefore, stainless steel may not work well with badminton racket at all .
    it has nothing to do with the knots at all.

    i wonder why people think knots contributes so much to tension loss. there are only millimeters worth of slippage that can come from the knot and beyond that the knot will come undone. and to my eyes, i have never even observed any knot slippage of that magnitude.

    the tension loss is due to the nature of stainless steel which plastic deforms after it reaches it's yield point. i have mentioned that earlier in the other thread.

    not much that can be done except to find a different material that has a higher yield point.

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    Administrator kwun's Avatar
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    Quote Originally Posted by Mark A View Post
    I thought of suggesting some adhesive on the knots, but it's a bit late now.

    There will be little tension loss in the "normal" way, especially if it behaves so much like Kevlar as kwun mentioned, so what there is will come from knot sliding and grommet/frame disintegration.

    We need teh video!!!
    as it turns out, even one half hitch was enough to tie the ends. the tying of the knots causes pretty drastic work hardening of the material, and that little knot is very very stiff.

    i observed the opposite than what you said.

    the knots are tight, and there is no grommet/frame disintegration. we are not dealing with hot wire here, just a smooth metal wire with a low 21lbs tension. the structure damage cause by 25lbs traditional nylon string probably cause much more structure damage.

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    So what is the final wet weight of the racket now?

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    Regular Member visor's Avatar
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    Did you prestretch it first?

  17. #17
    Administrator kwun's Avatar
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    Quote Originally Posted by visor View Post
    Did you prestretch it first?
    cannot pre-stretch this type of metal. after it reach yield point it will keep on stretching like a bubblegum until it gets too thin and snap.

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