Strange vibration after re-string

alexmcnab

Rookie
Recently re-strung one my my wilson ktours and noticed a strange noise when hitting with it. It's not a rattle but a vibration, more noticeable when I tap the top of the frame against my hand. I've taken the strings out although I don't think that's the problem. I only noticed it after the re-string but it might have been there before.

Had a poke around under the grommet strip at the top and checked it over for cracks with a magnifying glass but nothing out of the ordinary is obvious. Not sure whether to re-string and just see how it goes or whether to try re-placing the grommet strip or something else.

Suggestions much appreciated.

Edit: may have fixed it, removed the lead under the butt cap and it seems ok now, put the lead back in a bit more securely and still seems ok. surprised couldn't hear rattle and vibration only at the top but hey ho I'll string it up and see.
 
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Unfortunately, I think some strings are just like that. I almost threw a racket out once due to the vibration. Before I did, I decided to try out some cheap string in it so see if I could find a crack. Well, no crack and it didn't vibrate any more. It had to be the string.
 

eelhc

Hall of Fame
Unfortunately, I think some strings are just like that. I almost threw a racket out once due to the vibration. Before I did, I decided to try out some cheap string in it so see if I could find a crack. Well, no crack and it didn't vibrate any more. It had to be the string.
I too have had this happen and have wondered if some racquet, string, tension... combinations can result in a resonance situation...
 

diredesire

Adjunct Moderator
Yep, most odd buzzing issues I've found were almost always with the buttcaps. This is especially true with the trapdoor buttcaps.
 

1HBHfanatic

Legend
Ihave similar noise issue in 1of6 k.blade.tour rakets
ive inspected it. No visible cracks. On head/throat..
ill tape down the but cap and play with it to see if its the but cap as other have mentioned..
 

diredesire

Adjunct Moderator
Ihave similar noise issue in 1of6 k.blade.tour rakets
ive inspected it. No visible cracks. On head/throat..
ill tape down the but cap and play with it to see if its the but cap as other have mentioned..
I can't recall if the K Blades had trap doors, but if they do, it's a pretty easy test. Hold the racquet as usual, and hit the string bed against your hand nearer the tip of the frame. If it's buzzing, just pop the trap door out and repeat. If it still happens, inspect what's going on under the grip.

There are other possible sources of noise (such as damaged or loose grommets/strips), but buttcap is by far the biggest offender IME
 

alexmcnab

Rookie
This buzzing/vibrating seems to have come back, or perhaps I'm noticing it again and it never went away. I replaced the lead under the butt cap, tried it without the lead and tried it without the butt cap on but it still sounds weird. It's got the same string and vibration dampener as my other 2 rackets which are fine.

I'm running out of ideas...anyone reckon replacing the grommet strips might help?
 

lwto

Hall of Fame
I have strung a racquet before and a strange vibration occured, turned out it was the little 'tie off' piece. I must have tied it off in a particular way that for some reason was in just such a manner that it vibrated every time I hit the ball.

But as others have mentioned, it's usually a ill fitting butt cap.
 

esgee48

G.O.A.T.
Possible sources include loose butt cap trapdoor, cracked grommet(s), string tail (knot tip is buzzing, fix is a tail that lies along frame) and cracked frame. Frame resonance is also possible and can be checked by changing the string's tension or by adding some lead tape. I would temporarily add lead to 5 and 7 and see what happens. 2 cents.
 

Irvin

Talk Tennis Guru
This buzzing/vibrating seems to have come back, or perhaps I'm noticing it again and it never went away. I replaced the lead under the butt cap, tried it without the lead and tried it without the butt cap on but it still sounds weird. It's got the same string and vibration dampener as my other 2 rackets which are fine.

I'm running out of ideas...anyone reckon replacing the grommet strips might help?
My guess is something loose inside the frame. If you replace the grommet (which I would do) bounce the frame on some carpet to see if you can shake loose whatever it is and it may fall out of the grommet holes.

Another option is when you restring ease out some of the side grommet strips and see it you can shape something out. Usually if the side string grommets have not be messed up by knots you can ease them out and reinsert them with no troublem.
 

alexmcnab

Rookie
My guess is something loose inside the frame. If you replace the grommet (which I would do) bounce the frame on some carpet to see if you can shake loose whatever it is and it may fall out of the grommet holes.
I'll try and get a new grommet set and a wilson butt cap if I can find one in the (no luck yet). Wouldn't something loose in the frame cause a rattle rather than a vibration/twanging?

Thanks everyone for your thoughts, the tie-offs look fine.
@esgee48 can you explain more about Frame resonance please?
 

jhupper

Rookie
I've had/ still have a similar thing. Doesn't tend to happen on multi strings etc, happens most with poly and still not on all rackets. Isn't grommets as I can restring with a different string and it's gone. Am super careful and still happens.

Equally a newly strung job can be fine, and after bit of play it develops it. Dampener tends to deal with it but it drives me mad.

It must be something I'm doing but I can't figure it. I've also bought rackets that have come strung new, or strung by others and they have it, so at least it's not just me!!

If it was resonance I'd expect it would be short lived as the string freq would move outside the range fairly quickly????

I'd love to figure it out!
 

esgee48

G.O.A.T.
Each frame resonates at a small range of frequencies. Think of it as when you hit the sweet spot, you don't feel anything; hit outside that spot and the frame buzzes and vibrates like mad. What happens sometimes, is the combination of string tension and where the ball is hit causes the entire frame to vibrate. Another analogy is hitting the baseball with a bat. Hit the sweet spot and the sound it makes is very nice. Mishit and it sounds horrible. What you may be feeling from your frame are the multiples of of that range of frequencies. That's why I suggested a quick check with lead tape. That will quickly change the resonant frequencies since the extra mass from the tape will affect how the frame vibrates. HTH.
 

Irvin

Talk Tennis Guru
I'll try and get a new grommet set and a wilson butt cap if I can find one in the (no luck yet). Wouldn't something loose in the frame cause a rattle rather than a vibration/twanging?

Thanks everyone for your thoughts, the tie-offs look fine.
@esgee48 can you explain more about Frame resonance please?
more often than knot yes or it could cause a buzzing sound. Any of those could be defined as a vibration. I'm just guessing here.
 

struggle

Legend
I have this issue with one of my frames. I see what i THINK is a crack in the paint, but it might just be a scratch. Marked it with a sharpie and continue to use it. It's definitely not a large crack, typical of a broken /cracked frame. Not sure the frame is cracked at all.

It gives me some buzzy feedback on occasion, so i'm still not sure. Will keep playing the frame for now.
 

1HBHfanatic

Legend
I have strung a racquet before and a strange vibration occured, turned out it was the little 'tie off' piece. I must have tied it off in a particular way that for some reason was in just such a manner that it vibrated every time I hit the ball.

But as others have mentioned, it's usually a ill fitting butt cap.
This is interesting
do you recall the type of string? Poly or hard.syn.gut(types I would think would vibrate more)..
I got a client complaining about this recently
ill need to look for this also..
 

lwto

Hall of Fame
This is interesting
do you recall the type of string? Poly or hard.syn.gut(types I would think would vibrate more)..
I got a client complaining about this recently
ill need to look for this also..
I don't remember, poly probably.
 
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