Thoughts on reducing shear breaks at the top of the frame?

Discussion in 'Stringing Techniques / Stringing Machines' started by mikeler, Feb 15, 2014.

  1. mikeler

    mikeler G.O.A.T.

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    I've been using the Prince Tour 100T ESP for a few months now. It is an open 16x16 pattern so I know I'll break strings quicker. I have not had a problem with most polys but my new favorite Discho Iontec broke both times at the top of the hoop. The first time it took 3 sets but the 2nd time it was only 3 games!

    For those who will say "Just hit the center of the strings", you have never seen me play. Shanking is in my blood.

    Both times where the Iontec broke was between the last grommet on the side and the first O-port. The rackets are new and it happened on two different frames. I inspected both and don't see anything suspect in those areas. I think this string is just prone to shear stress.

    I really like stringing this frame with poly at 60# to help with control in the open pattern and it also seems to help with string snap back. So I've had the following thoughts on how to help the strings last longer:

    1) Clamp the top mains away from the frame and deal with whatever tension loss happens.
    2) Use string savers along the top cross.
    3) Power pads in the problem 2 areas at the top?
    4) Lower tension if all else fails.

    Any ideas would be greatly appreciated.
     
    #1
  2. am1899

    am1899 Rookie

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    Was it the main or the cross that broke?
     
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  3. darklore009

    darklore009 Professional

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    you can try using tubing around that area of break. i guess your case is similar of john isner's racket. he used to breaking his strings around the hoop area
     
    #3
  4. KineticChain

    KineticChain Professional

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    I've had the same problem. Honestly, I think it's a racket issue. I put the same string into two different rackets and only one snaps near the frame on mis-hits. Almost always. It's never happened with the other racket, and I've shanked plenty with it.

    This is pure speculation.. but it might have to do with hoop of the racket . One has a larger diameter hoop which kinda hangs over the strings a bit... while the other is almost flush with the string bead. Maybe it's possible that the thicker frame hoop defends the top of the strings from that acute shear force? It could just as easily be something completely different though
     
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  5. esgee48

    esgee48 Hall of Fame

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    IMO, the 1st 3 options don't work. Lowering tension seems the way to go. Changing string brand to something less stiff or changing to a thicker gauge seems to be the better choices. The string breaks because of stress. Anything to reduce the stress across the area of the string is the way to go. Kevlar in a very thin gauge may also be an option.
     
    #5
  6. gmatheis

    gmatheis Hall of Fame

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    I'd give this a try first.
     
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  7. SwankPeRFection

    SwankPeRFection Hall of Fame

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    Your problem is that you string so high that your clamps are so tight they mar the strings in order to keep from slipping at 60lbs. Either dial the clamps back some so you stop pinching the string so much or dial back the lbs on the string if it's slipping too much.

    Your problem is not the shanking. It's your stringing skill or lack thereof.
     
    #7
  8. Irvin

    Irvin G.O.A.T.

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    Tube the string at the top
    Lower tension
    Use a folded business card when clamping string
    Lower tension
     
    #8
  9. uk_skippy

    uk_skippy Hall of Fame

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    As mentioned before, tubing should suffice.

    Which machine is it strung on?

    Regards

    Paul
     
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  10. jim e

    jim e Hall of Fame

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    Just a thought, may not be issue at all but..
    If it broke at the very center main at top, possibly could be from 1st clamp (anchor clamp), the anchor clamp either too tight crushing string as not to have string slip, or not tight enough and the clamp is allowing string to slip a little marring string.
    I would be sure anchor clamp is just snug enough and either back up the anchor clamp with a starting clamp, or use Yusuki method of starting mains.
     
    #10
  11. Irvin

    Irvin G.O.A.T.

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    Good idea Jim I think the clamps have a lot to do with shear at the top. The business card trick should fix that.
     
    #11
  12. mikeler

    mikeler G.O.A.T.

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    Gamma X-ST. I've never used tubing before. Will it work on an O-port?

    Jim and Irvin, I'll try the business card trick.

    Just to clarify this is happened on I believe the 4th main over from the edge where the 100T transitions from grommet into the middle O ports. I inspected that area today and the poly has to make a very sharp turn there which leads me to believe that relieving the sharp turn could help.

    Swank thanks for the destructive criticism lol.
     
    #12
  13. tinyman

    tinyman Rookie

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    mikeler, I have one of those rackets here with me - it's a demo frame so I haven't strung it myself, but I don't see any reason why you couldn't use a piece of tubing there. That's where I would start, at least... you might be able to get away with just putting it at that bend, not going from grommet to grommet (or grommet to hole, in that case).
     
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  14. uk_skippy

    uk_skippy Hall of Fame

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    Tubing will work on O-ports. If it's 'needed' where the O-ports are next to each other, a simple U shaped piece of tubing will work. It'll take a bit of effort to get right if not experienced, but not impossible. If its at the O-port to grommet section, you'll need a smaller, half U piece of tubing.

    Also, as Ive mentioned in another thread, try double wrapping the string on the diablo to move the biting point of the string in the gripper.

    Hope this helps

    Regards

    Paul
     
    #14
  15. mikeler

    mikeler G.O.A.T.

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    It is the 100T not the Diablo. What does double wrapping mean? Thanks for the help so far.
     
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  16. mikeler

    mikeler G.O.A.T.

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    That one turn is very sharp so I agree that could be the only area is may be needed.
     
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  17. struggle

    struggle Hall of Fame

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    the diablo would be on your tensioner, the round thing that you wrap the string around before feeding it into tensioner jaws.

    he's saying to wrap it more than once to change the spot on the string where the gripper jaws engage, likely moving that spot lower into the stringbed.
     
    #17
  18. A Defenseless Creature

    A Defenseless Creature Semi-Pro

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    You could also go to the Kimony USA web site and look at the starting block that is located in the tools section.
     
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  19. mikeler

    mikeler G.O.A.T.

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    I never knew the name of that piece. I understand now, thanks.


    I don't use my starting clamp at the top of the frame.
     
    #19
  20. PBODY99

    PBODY99 Hall of Fame

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    Tubing at the sharp corners should do it. The double wrap around the diablo reduces the stress of the string in the tensioner.
    My O_Ports had that shank break problem, and the tubing solved it.
     
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  21. mikeler

    mikeler G.O.A.T.

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    Great info, thank you.
     
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  22. zapvor

    zapvor Legend

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    or stop shanking
     
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  23. mikeler

    mikeler G.O.A.T.

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    Read paragraph 2 of post 1. I bought the teflon tubing. Probably should have asked the experts which one is better between that and nylon. It just seems like teflon would be smoother and provide less friction with all surfaces.
     
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  24. am1899

    am1899 Rookie

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    Late to the party, but I've had customers have this happen to them, and tubing solved the problem. Good luck.
     
    #24
  25. PBODY99

    PBODY99 Hall of Fame

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    Teflon is easier for me to work with as it is usually thinner the the general nylon tubing.
     
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  26. struggle

    struggle Hall of Fame

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    i keep both nylon and teflon, usually reserving the teflon for tougher installations (through tiny grommets, shared holes, etc) as it is slicker, more malleable and heat sensitive (it can be stretched to be thinner).
     
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  27. mikeler

    mikeler G.O.A.T.

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    Sounds like teflon is the way to go for me then.
     
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  28. struggle

    struggle Hall of Fame

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    i think the nature of the nylon (thicker and stiffer) means it gives more protection than the teflon (where applicable/usable), but not sure it matters. you done good, if i only had one of them, i'd go with the teflon.
     
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  29. Irvin

    Irvin G.O.A.T.

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    All tubing is easy to stretch when heated Teflon is just smoother. If you have a racket like a Babolat with small grommets and a thick string you're in trouble. But the OP has a Prince O Port racket and is having shear problems. I would rather use the nylon tubing as it stays in place better and it's thicker for more protection. If the tubing sticks out past the frame on the string IMHO it does not look very professional.
     
    #29
  30. struggle

    struggle Hall of Fame

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    Factory grommets do, so i disagree.....so long as they are neat and nearly the same length etc.
     
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  31. Irvin

    Irvin G.O.A.T.

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    As long as each piece of tubing sticks out past the the frame the same distance like factory grommets do I would agree with you. But that is not going to happen unless you spend an awful lot on time on them.

    EDIT it is much easier to get them so none of them extend past the frame.
     
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  32. struggle

    struggle Hall of Fame

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    sounds like a similar process for each, so i'd rather have them stick out, like grommets.

    cheers!!
     
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  33. mikeler

    mikeler G.O.A.T.

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    I string only for myself so I'm not real concerned about looks. The string I've been having issues with is 1.30mm so it is on the thicker side but not like some of the new polys designed for these frames in the 1.35mm to 1.40mm range.
     
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  34. Irvin

    Irvin G.O.A.T.

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    Just make sure your clamps are not crushing the string and use some tubing at the top. If you still have problems ditch the Discho.
     
    #34
  35. bluegrass_stringer

    bluegrass_stringer Semi-Pro

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    Tubing might help, but sometimes you can get bad combinations of racquets plus string. Remember Zvonerava at the US Open? She was using a speedport racquet plus gamma strings, and they kept breaking. Changed strings, and it was fine. Sometimes as a racquet technician, there is nothing you can do to prevent the premature breakage like this.
     
    #35
  36. mikeler

    mikeler G.O.A.T.

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    I've loosened my clamps. I just bought a reel so I'm hoping your 2 suggestions do the trick. The string just is a perfect match for my frame so I have to try and get more life out of it. I've busted 1 or 2 other polys up in that area as well. IMHO, it is a flaw with the frame but most polys hold up just fine.


    I'm hoping that is not the case but I won't know until I try.
     
    #36
  37. djNEiGht

    djNEiGht Professional

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    I strung a friends o-port and there was signs of worn out pain and some edges. One port was really bad. I tubed all of the o-ports and anywhere a grommet wasn't at because it was worn down past the paint.

    head ache...
     
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  38. mikeler

    mikeler G.O.A.T.

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    Luckily my sticks are relatively new. :)
     
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  39. Irvin

    Irvin G.O.A.T.

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    So were the frames djNEiGht was stringing at one time. The more open your pattern the more the strings will move. Better to tubing those ports now than when you absolutely have to tube them.
     
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  40. mikeler

    mikeler G.O.A.T.

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    I'll be onto another racket when these get old. I put in the tubing tonight at the location of my last 2 breaks. I'll be curious to see if that just shifts the break to a different O-port next time. If it does, I'll tube them all as the next experiment.
     
    #40
  41. djNEiGht

    djNEiGht Professional

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    When the o-port racquet comes back for stringing, the owner usually leaves the strings in with out cutting to release the stress...anyways it works to my favor because I can pretty much reuse the tubing
     
    #41
  42. mikeler

    mikeler G.O.A.T.

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    The tubing worked great for me at the top of the frame today. This time it broke at the bottom grommet! Before I get totally tubular with all the main string grommets, I decided to bump the tension down 10 pounds and see if the problem persists.
     
    #42
  43. Irvin

    Irvin G.O.A.T.

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    Souds like you have Isnerism. LOL Isner has all his string tubed that go through an O Port.
     
    #43
  44. mikeler

    mikeler G.O.A.T.

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    Too bad I'm nowhere near as good a player. The break today was between 2 grommets. Worst case I use this string only as a cross.
     
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