Calibrating machine with or without racket?

Discussion in 'Stringing Techniques / Stringing Machines' started by ryohazuki222, May 10, 2008.

?

How do you calibrate

  1. A) Without racket

    19 vote(s)
    86.4%
  2. B) With racket through grommet

    3 vote(s)
    13.6%
  1. ryohazuki222

    ryohazuki222 Semi-Pro

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    Which do you do?

    A) Clamp the calibrator and pull/crank to check tension.

    or

    B) Mount racket and clamp calibrator inside the frame, threading through the grommet.

    If you do both, do the results vary? How much?
     
    #1
  2. deehacker2005

    deehacker2005 Rookie

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    Hi,
    I calibrate without a racquet. I asked this question a while ago and the majority of the experianced stringers suggested that calibrating without a racquet would give more consistent results. The reason they gave was calibrating with a racquet on a machine will give a different result depending on the racquet used. If you're only stringing one type of racquet than I guess it's ok to calibrate with a racquet. But since most people string a varieity or racuqets it would be better to calbirate without a racquet. I get about a 5-7 pound differnece when I calibrate without a racquet and then calibrate with a racquet, depending on the type of racquet I use to calibrate. That's why I calibrate without a racquet. Hope that made sense. I'm sure someone else will have a better explanation....lol
     
    #2
  3. YULitle

    YULitle Hall of Fame

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    I calibrate without. But I've seen someone post a method on how to do it inside the racquet. He suggested that is is more accurate. I think that you should do it the same way every time regardless.
     
    #3
  4. LttlElvis

    LttlElvis Professional

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    Being that every racquet is different, I think calibrating without one is the only constant.
     
    #4
  5. furyballs

    furyballs Rookie

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    If the string is not pulling at an angle from the grommet it shouldn't make any difference.
     
    #5
  6. jim e

    jim e Hall of Fame

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    How about when you string an O 3 , and lock the turntable at a good angle, then take a reading and see just how accurate the tension is at times. Seems like even a slight amount of friction against a grommet or any angle will produce a decrease in the reference tension.
    I never measured it with a racquet in the machine, but I can see where it can vary that way, with different angles and friction against the grommets.Make you think just how accurate the job really is with just about any machine there is.I always assumed consistancy is the most important thing about the process.
     
    #6
  7. Mansewerz

    Mansewerz Legend

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    How do you calibrate? Do you just make mental note and remember that 60 lbs is actually 55 lbs? Or does the machine itself get adjusted?
     
    #7
  8. furyballs

    furyballs Rookie

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    the machine gets adjusted
     
    #8
  9. Steve Huff

    Steve Huff Legend

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    If you calibrate with the racket in place, and by chance, the string on the calibrator breaks on the side furthest from the string gripper, you've probably just pulled a calibrator through your frame. Could be an expensive lesson. Do it without the racket.
     
    #9
  10. jim e

    jim e Hall of Fame

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    Hi Steve:That would make a good problem, never thought of that!Excellent possibility to be made aware of, at least to someone elses racquet.But also I cannot see how accurate the calibrator would be inside the racquet anyways, if not used in every pull situation what good would it do?, due to angles and grommet friction, seems that the actual tension would vary across the entire bed of strings anyways, and the best you can do is start the job with an accurate pull without the racquet, and be sure that the job is done consistantly, and to the best of ones ability, without any shortcuts. Would make a great picture seeing a calibrator being pulled through a racquet, I'm sure it was done by someone somewhere.
     
    #10
  11. iplaybetter

    iplaybetter Hall of Fame

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    behind you, but i have to be somewhere else by the
    i double clamp the calibrator
     
    #11
  12. jim e

    jim e Hall of Fame

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    Like Steve says, if the string breaks between your double set of clamps and the calibrator, what do you think will happen?
     
    #12
  13. iplaybetter

    iplaybetter Hall of Fame

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    behind you, but i have to be somewhere else by the
    not sure, they go right next to eachother so it is likea mega clamp
     
    #13
  14. TenniseaWilliams

    TenniseaWilliams Professional

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    No racquet, no clamps. I attach the calibrator directly to the racquet head mounting post, other side goes to tensioner. Anybody try calibrating with different string types?
     
    #14
  15. YULitle

    YULitle Hall of Fame

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    Messin' with fire there, I would suspect. I would love to see any kind of reliable test on that topic. Could just prove my point on the relativistic nature of tension.
     
    #15
  16. jim e

    jim e Hall of Fame

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    I never attempted it, but would be interested to see what the tension loss would be while a boomerang is stuffed into one of the prince ports, I'm sure there would be a significant tension loss.Has anyone measured that?
     
    #16
  17. fastdunn

    fastdunn Legend

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    I do without a frame. It's just a reference tension anyway.

    But I was thinking about tension difference between pulling off at 0 angle and at about 45 degree angle. Anybody tried (without paying for a lesson :) ) and has data on this ?
     
    #17
  18. YULitle

    YULitle Hall of Fame

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    This kind of data would be relative to many factors that are involved in the test:

    string type
    string gauge
    machine material (the spot the string goes around)

    Also, it depends on how the test is set up. Where does the bend occur? Is it AT the end of the calibrator, or somewhere along the string towards the tension head?

    Either way, in a perfect world of no friction, these values could be calculated with simple physics. If you are pulling the string at a 45 degree angle directly off of the end of the calibrator, it should be exactly half of reference, as half of the tension is being applied in one direction, and the other half in the other. If you are pulling the string at an angle at some point along the string between the calibrator and the tension head, then it should EQUAL reference tension (again, remember, no friction.)
     
    #18
  19. SW Stringer

    SW Stringer Semi-Pro

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    " . . . If you are pulling the string at a 45 degree angle directly off of the end of the calibrator, it should be exactly half of reference, as half of the tension is being applied in one direction, and the other half in the other. . . . "

    Naaah! Don't think so.
     
    #19
  20. severins

    severins New User

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    Calibrating is best without racket.

    Take one clamp and fix in any string then the string is fixed to a calibrator, I prefer a digital one because you can get it in +/- 0,2 kg excatness.
    From the calibrator you go to the pulling clamp.

    Befor you start pulling you push on a button to get your 0 kg calibration.
    Then push on the button to measure the weight. Start the stringing machine and after a while you will hear a beep which means the measurement is ready.

    You can read digitally your exact stringing kgs.

    The problem I have seen with my electrical machine that the value is not as exact as I thought. When you pull 10 times without changing anything it shows different weights. So it is verry difficult to calibrate.

    The tension calibrator with a spring, specially for stringing machines, where not very secure therefor I switched to a digital one.
     
    #20

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