How to properly use a drop weight

Discussion in 'Stringing Techniques / Stringing Machines' started by andrew_slattery, Apr 4, 2005.

  1. andrew_slattery

    andrew_slattery New User

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    I am wondering how to properly use a drop weight. Do you just let the weight drop until it stops? do you lower the weight gently? does the arm have to be at the 3 o'clock position? These are things ive heard, but a little clarification would be great.

    Also, how accurate are drop weights (tension wise).

    Thanks,

    - Andrew
     
    #1
  2. rich s

    rich s Hall of Fame

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    on laserfibre machines you just let the arm drop and regardless of where it stops you are supposed to get your desired tension.

    on all other drop weight machines you are supposed to let the arm come to rest at the 3 o'clock position to get the achieved tension but simple geometry tells us that if you get the arm within +/- 6 degrees of horizontal (3 oclock) you will achieve 99.5% of your desired tension.

    you don't just let go of the arm and let it fall under the accelleration of gravity, you let it down manually.

    drop weights are as accurate as any other stringing machine and a little more so in that they work on gravity so as long as gravity is 32.2 ft/sec^2 you don't have to calibrate them and they don't vary their pull due to changes in line voltage like some electric machines or change in spring strength due to sag as in manual crank machines.
     
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  3. Radical Shot

    Radical Shot Semi-Pro

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    I have a question also regarding dropweights. With the foot-operated Laserfibre/Stringway DX200 upright machine, how does that work? Does it drop the weight and then return it? Is this a good machine?
     
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  4. ERicJ

    ERicJ New User

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    The DX is not a traditional drop weight machine. I think it's a spring tensioned unit.

    The FX is Laserfibre's floor standing drop weight machine. Basically a TT on a factory mounted and integrated stand as opposed to the rather clunky add-on stand available for the TT.

    At least that's what I recall Tim telling me.

    ERic
     
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  5. spirit

    spirit Rookie

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    That is reassuring. Should be able to eyeball it and get within +/- 6 degrees of horisontal. However, per my question in another post, can you use a small palm sized level (I have one in my tool box) to check how level the bar is?
     
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  6. rich s

    rich s Hall of Fame

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    you don't need to spend the time or effort with a level. if you can get it close enough that the tip of the bar is 1" or less above or below horizontal you will get better than 99.5% of your desired tension.

    if the desired tension is 60 you will get 59.7lb. You can't tell 59 from 60 nevermind 59.7 from 60.

    don't sweat it, it is pretty easy to achieve on a consistant basis once you string your first frame.
     
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  7. Prince_of_Tennis

    Prince_of_Tennis Semi-Pro

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    This really boosts up my confidence in my Gamma Prog II =)
     
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