Tension jaw leaves marks

Discussion in 'Stringing Techniques / Stringing Machines' started by BlxTennis, Apr 8, 2012.

  1. BlxTennis

    BlxTennis Rookie

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    I just noticed that the tension jaw makes these tiny vertical marks on my strings(not gut). I can feel it scrapping against my finger. They are not deep cuts. So far they are not a problem on my Poly, Multi or Synthetic strings both 16g & 17g. I don't think that will be good for natural guts. I adjusted the gripper so it's not too tighter but not slipper but the marks are still there. Is there anything I can do?
     
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  2. TennisNinja

    TennisNinja Hall of Fame

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    Try folding a business card or index card and have it on each side of the string.
     
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  3. BlxTennis

    BlxTennis Rookie

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    You mean make the business card U shape and insert into the jaw so that the card wraps around the string when pulling tension? Hm...I guess I can try that as long as it won't slip. Thanks for the tip. I will try that next time stringing.
     
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  4. Irvin

    Irvin G.O.A.T.

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    Your string is slipping through the gripper. Clean it and use something to mark the string with to make sure it does not slip more.
     
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  5. MAX PLY

    MAX PLY Hall of Fame

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    ^+1

    And note, I recommend that you always clean first, then look to adjust. Slippage is almost always the result of residue that builds up in the gripper from the coating on most strings these days. Good luck.
     
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  6. BlxTennis

    BlxTennis Rookie

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    I did check for slippage first and that does not appear the case. I adjusted the back screw to tighten or loose the jaw and in both cases, I felt the marks afterward.
     
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  7. BlxTennis

    BlxTennis Rookie

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    I will try to clean the jaw and check again. Is it alchohal with cotton swap?
     
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  8. fortun8son

    fortun8son Hall of Fame

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    An old shoelace dipped in alcohol works nicely for this.
    Swabs leave fuzzies.
     
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  9. Ronaldo

    Ronaldo G.O.A.T.

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    What is the best way to determine slippage?
     
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  10. Irvin

    Irvin G.O.A.T.

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    Mark the string with a sharpie before you pull and see if the mark moves.
     
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  11. Ronaldo

    Ronaldo G.O.A.T.

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    Ty, local stringer suggested backing up your clamp with a paper clip.
     
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  12. BlxTennis

    BlxTennis Rookie

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    How does a paper clip back up a clamp?
     
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  13. retlod

    retlod Professional

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    I think others may have misunderstood you. The marks are caused by the ridges in your tension gripper, right? They keep the string from slipping. If they leave marks, it's normal and won't damage the string.
     
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  14. BlxTennis

    BlxTennis Rookie

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    Yes, I think you know what I mean. If I get a chance, I will try to take a photo of what it looks like. They are tiny vertical marks on the string. I peaked inside the jaw and I can see that the jaw has these tiny groves as well. So even for natural gut that's not a concern? You all get that on your string from the jaw? You can definitely feel it when you run your finger across the area. The thing I noticed is that, the marks only happens from the front of the jaw closest to the mounting post. No marks on the string on the other end of the jaw. So if the jaw is 2" long, the marks is about 1/2" long with tiny scratched marks toward the front of the string where it's being clamped by the jaw.
     
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  15. Irvin

    Irvin G.O.A.T.

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    If you can feel the roughness on the string after clamping it is not normal. Ghosting is OK but not marring. Maybe there is one burr somewhere.
     
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  16. Irvin

    Irvin G.O.A.T.

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    You place it about 1/4" away from the clamp if the distance changes you have slippage.
     
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  17. Ronaldo

    Ronaldo G.O.A.T.

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    #17
  18. dode

    dode Rookie

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    My old alpha machine (15 years old) was that way. It was just the texture of the gripper that left marks on the string, and there was no adjustment for it. I used the business card trick and never had an issue.

    John
     
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  19. BlxTennis

    BlxTennis Rookie

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    Yup, business card trick took care of this although I can still feel on the string area where the gripper grips. If not for the card, it will leave tiny groves in a small area of the string.
     
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