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Getting way too high tension?!

Discussion in 'Badminton Stringing Techniques & Tools' started by Torstein, May 1, 2018.

  1. flyingcords

    flyingcords Regular Member

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    Perhaps you could try a calibrator made for stringing machines. Just to be sure. Even if I tried one, and it's not easy to read the value on it, and I'm not pretty convinced it will make a difference. My digital scale is more practical and both have given the same result, more or less.
     
  2. ljkmann

    ljkmann Regular Member

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    I've finally got round to taking some reference measurements and results are below. Indeed there is a ~2.5kg discrepancy across the board.

    Tables.PNG

    Graph.PNG

    Measurements were taken using @Charlie-SWUK technique with the gripper finishing at about the 7 o'clock position.
    Penta Premium have also concur with the view that the gripper should not be reversed or inverted to the 9 o'clock position.
    They sent across the illustration below:
    Angle.PNG

    I've also had the opportunity to string a couple more rackets:

    1. with gripper @9 o'clock position
    14 x 15 kg = expected 32lbs
    Per Stringer was 25lbs
    Difference of 7lbs or 3.6kg

    2. with gripper @9 o'clock position
    15 x 16 kg = expected 34lbs
    Per visor's thread on Pingtails I used Carltune app which reported a 26lb tension
    Again, Difference of 8lbs or 3.4kg

    3. with gripper @ 7 o'clock position
    11.5 x 12.5 kg = expected 26lbs
    Per visor's thread on Pingtails I used Carltune app which reported a 20lb tension
    Difference of 6lbs or 2.7kg

    So, string jobs 1 and 2 were performed incorrectly with the gripper at 9 o'clock hence the larger discrepancy. Stringjob 3 was performed correctly, and ties in with the graph I've plotted above.

    I am completely baffled by what is causing this 2.5kg difference. Any other suggestions? Thanks all.
     
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  3. DarkHiatus

    DarkHiatus Regular Member

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    It’s a cheap machine (relatively). Quality control isn’t going to be at the same level of a £3k professional electronic tensioner setup! Don’t be surprised if the factory guidance is simply put the sticker x distance away from the pivot and they never actually check with scales.

    Be happy you’ve found a fix, and now you’re confident your machine is well-calibrated! It’s like me buying a cheap bike because the ‘gears were broken’ and it turns out they were just not indexed right. 15 minutes later I’ve got a fully functional top-of-the-line bike :)
     
  4. ucantseeme

    ucantseeme Regular Member

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    I think if the scale is faulty or the machine must be clarified if you change one of the them. Returning the machine is complicated so I suggest to buy a useable digital scale on ebay with DMS (strain gauge) instead of a spring (which can wear down easily). Depending what measuring tool you use it also have tolerances. The tools which measure in a small window are mostly more accurate. It's not uncommon that some tools for use at home have 5-10% tolerance from the maximum value. I wouldn't trust this scale. Get a digital one on ebay. I have this one which turned out accurate for me:

    https://www.ebay.de/itm/Digitale-Ko...395756?hash=item3f91a42e6c:g:XgIAAOSwQwZaXLId

    IMO it hasn't to do with gripper position or the lever position or any other small details which people here break down etc. get a proper scale. ASAP!
     
  5. Torstein

    Torstein Regular Member

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    Folks, im bringing this thread back to life. So, I have bought myself a WISE, and thought that I would never have to worry about horizontal levels and tension accuracy again.
    HOWEVER,
    I get too high tension??? Just strung a racquet at 10,5x11,00 kg, and the day after it shows 12,0 kg on the stringster app. Kind of depressed right now, what on earth am I doing wrong. Strung it with li ning nr.1 and 10% pre stretch.[​IMG]

    Sent fra min ONEPLUS A6003 via Tapatalk
     
  6. s_mair

    s_mair Regular Member

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    Dude, you really do have a cursed machine or something.

    First of all, forget stringster as a credible reference. Can you share the racket model and ping frequency (CarlTune or Cleartune)? That would be way more telling and offers a chance to compare it with results from others.

    And then, have you checked the calibration of the WISE? I'd rate it as unlikely to impossible, but maybe you got a badly calibrated one.

    Edit:
    Just noticed that you were using PS. So that already explains about 0,5 kg deviation already. I constantly get out results with 20-30 Hz higher pings if I use 10% PS.
     
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  7. Torstein

    Torstein Regular Member

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    Thanks. Around 1250 hz it says

    Sent fra min ONEPLUS A6003 via Tapatalk
     
    ucantseeme likes this.
  8. Torstein

    Torstein Regular Member

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    Racquet model is FZ Forza Titanium 10.000 M
    I havent checked calibration on the WISE, thought it was perfect
     
  9. ucantseeme

    ucantseeme Regular Member

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    Bin this Stringster-****. This App is totally rubbish. I strung various rackets which turned out spot on and several rackets which are totally off. 13kg on JS10 turn out on stringster at 14.1kg. 9.5kg on ZFII turned out at 10.6. At 11kg turned out 12.1. MX80 at 9.0 turn out 10.1 kg and so on even without PS. N7II always turn out 12.9 on 13 or 13.4 on 13.5. Use carltune and ditch stringster. IMO your machine is accurate and the app is ****. Don't worry. I used stringster on 3 (Sony, Sony, Huawei) different phones and 1 tablet (Samsung) and the device isn't the culprit. I got very often a 1.1kg higher reading, only on the N7ii I'm incompetend to string it higher than usual. Very suspect.
     
    #69 ucantseeme, Dec 22, 2018
    Last edited: Dec 22, 2018
    s_mair likes this.
  10. s_mair

    s_mair Regular Member

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    100% agreed. The results I got from Stringster were so random and dependant from the racket that I've deleted it in the meantime.

    1250 Hz is at the tighter end, but fully within the expected range for the given setup I would say. Especially with 10% PS.

    My advice: Enjoy your newly updated machine (which is a killer setup by the way!) and focus on ping frequencies if you want to have a control indicator for your process.
     
  11. Torstein

    Torstein Regular Member

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    Alright thanks a lot guys

    Sent fra min ONEPLUS A6003 via Tapatalk
     
  12. ucantseeme

    ucantseeme Regular Member

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    At the end of the day who cares about numbers? If something feels too loose add tension, if it feels too tight drop tension. Even customers can adjust after the first job on their request when too loose or too tight feeling occur. I normally mention for new customers "Alot people got the impression that my jobs are tighter than from others (those who use flying clamps, clamping 5cm from the frame, use crank and so on). Should I knock off 0.5 kg for your request?"
     
  13. Torstein

    Torstein Regular Member

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    Yeah, I mostly string for club members, and they really don't really care, as long as they last. I have tried different tensions and have found the perfect for me, so it doesn't matter yeah.

    Sent fra min ONEPLUS A6003 via Tapatalk
     
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  14. ucantseeme

    ucantseeme Regular Member

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    These guys really don't care about a superb string performance. They just count the month and judge by the durability. Easiest clients. You just need to scare them that increased tension needs less durabilty and they stay at 9.5kg max. :D
     
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  15. s_mair

    s_mair Regular Member

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    Guys, I'd like to revive this thread once more to ask anyone of you a favor. As some of you might know, I've started a (german) group on Facebook concerning badminton stringing and currently, I'm in contact with one colleague who is making the exact same mistake as the OP in the beginning: He pushes the lever down with his hand. And to show him and others the actual impact of that, it would be perfect to have a short video that shows the resulting tension on an installed fishing scale.

    And since I'm no longer owning a drop weight machine myself - can anyone of you guys help me out and take a short video of this?
    1) So let's say the drop weight is set at 10 kg and the lever is slightly above horizontal: Scale shows ~9.x kg
    2) Then push down until it's horizontal and show the resulting numbers on the scale

    The universe will thank you with a decent portion of good strining karma for this. :)
     
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  16. endFX

    endFX Regular Member

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    Sorry for the crappy quality, but you get the idea.

    Note that I removed the locking mechanism that holds back the tensioner when lifting the weight.
    You can see the bar raising back up when I released my finger because of it.
    Imo this locking thing is annoying to deal with and slowing down the whole process.
    I generally recommend removing it and it will likely fix the problem with incorrect tension too.
    I would also suggest to get some kind of scale like I'm using here because the marks on the tension bar are fairly inaccurate.
     
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  17. s_mair

    s_mair Regular Member

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    Thanks a lot mate! Just to make sure that I read the numbers on the scale correctly - it's 9.8 kg in balance and goes up to around 13 kg with that gentle push applied, right?
     
  18. endFX

    endFX Regular Member

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    Yep, that's right.
    It's easier to see on a big screen.
     
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  19. flyingcords

    flyingcords Regular Member

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    I have the same machine and I completely agree with you about this locking mechanism. It slows the process and it's a p... in the a.. to unlock.
     
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