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Thread: Why +2lbs On The Cross?
02-14-2005, 08:14 AM #18
Racket stringing. The Answer...
Very interesting all that. I play tennis, and have a stringing machine ( Tyger Profi 55 ) and although we are talking about different tensions and guages, the principles remain the same ...
I have been bothered for some time about the fact that the crosses are obviously less tight than the mains because of the reasons already mentioned, i.e. that the crosses tighten the mains as they ( the crosses )are pulled. An effect of this must surely be that the ball/shuttlecock is send back mainly under power from the resilience of the main strings only. The crosses must have little to do with it as the mains reach their maximum stretch point well before the crosses will even be tight !
This seems like a pretty undesirable situation. Surely if the mains and crosses had the same tension, better ball control would be the result - although, as the crosses are shorter, their maximum stretch point would be reached before that of the mains, so pêrhaps a slightly lower tension is after all desirable for the crosses !
But how can this be achieved ?... The tighter you pull the crosses, the more tension will be put on the mains, so a much lower tension seems desirable for the mains, and higher for the crosses... But, I've tried this, and it doesn't seem to work, as, the high tension on the crosses just pulls the mains even tighter !
For information, when I string my racket normally, the mains measure at 25Kilos, but the crosses at at only 12. This is lamentable ...
The only way I can see to keep tension even would be, starting at the middle of the racket, to string one main followed by one cross, one main, one cross, etc. etc... That way a main will tighten the cross, then a cross will tighten the main etc...
Trouble is, you will need around 4 clamps to acheive this. It is not possible with just 2 fixed clamps, and resorting to flying clamps results in less accuracy ....!
Another big problem, is that in normal stringing, each cross string has progressively more friction on it from the mains, resulting in less tension on the final crosses. Most people worry about even tension on both sides of the mains, but look at the way a ball is hit, and you will see that the racket is more in a horizontal position than a vertical one ( in tennis anyway ), so the balance of the crosses on either end is actually more important...
I remember I once saw on the Fischer website, a factory worker stringing a racket, and he was using a device which held apart the mains, while he strung the crosses. The crosses did not touch the mains, and therefore avoided any friction. But where does one obtain such a device ?....
One final point. When I have my rackets strung on the big, expensive Babolat machines, they play better than mine ! However, they are strung conventially, with less care and attention than I give. I can only assume that the clamping system is of very high tolerence, with little freeplay, therefore minimizing tension loss. This is perhaps after all, the most important factor of all ... If only I could afford one .... !!
03-09-2005, 01:43 AM #19
I just noticed that Yonex recommends 2 pounds higher tension for cross for their old models such as Ti10. But for the latest models, they only recommend 1 tension for both main and cross. Can anyone come up an explanation for it?
縦 means main. 横 means cross
03-09-2005, 04:08 AM #20
That is not how I read it. The 1lb difference is between a 2U and a 3U, or a 3U and a 4U. Even when Yonex is more specific, like when suggesting both main and cross tension, the 2lbs difference is a rough guide. A more accurate difference is 10%.
03-09-2005, 11:03 AM #21Originally Posted by taneepak
The "1 lb" difference is referring to the "min and max" recommend tension between different models with different "U".
The "2 lb" difference that we are talking about, is the "main vs cross" for the same racket.
03-09-2005, 07:05 PM #22
Hi Taneepak and LazyBuddy,
You guys misunderstood me. There is a 1 pound difference between 3U and 4U rackets. But for old models, they also recommend two tensions for main and cross:
For Ti 10:
So for the older models, they recommended different tensions for main and cross, but this is no longer the case for the latest models...
Originally Posted by LazyBuddy
03-09-2005, 08:55 PM #23
There is no inconsistency. One is a brief classification of tension range, usually used in circumstances where space is limited, like on the cone of a racquet. The more detail tension range is usually indicated in Yonex's spec chart. For example, on my MP99 2U the small label on the cone of my racquet says 18-22lbs, 8-10kg, but the spec chart says Main 18-20lbs 8-9kg, Cross 20-22lbs 9-10kg.
Despite its modest tension range of 18-22lbs, I string my MP99 to 27-29.5lbs.
03-10-2005, 03:35 AM #24Originally Posted by catbear
I have the UK Yonex badminton catalog 2005 and it says
NS7000 3U Main 19-22 lbs Cross 21-24 lbs
NS8000 3U Main 19-22 lbs Cross 21-24 lbs
AT800OF 4U Main 19-22 lbs Cross 21-24 lbs
AT800DE 4U Main 19-22 lbs Cross 21-24 lbs
AT500 3U Main 20-23 lbs Cross 22-25 lbs
AT300 3U Main 20-23 lbs Cross 22-25 lbs
MP99 3U Main 17-20 lbs Cross 19-22 lbs
MP88 4U Main 16-19 lbs Cross 18-21 lbs
Last edited by Neil Nicholls; 03-10-2005 at 03:38 AM.
03-31-2005, 01:39 AM #25Originally Posted by Neil Nicholls
just my analogy.. dunno if it can apply to badminton strings
03-31-2005, 02:32 AM #26Originally Posted by SWC_Ant
if your rope is elastic, it will stretch.
03-31-2005, 02:39 AM #27
It all actually depends.. guess what.. 2 days ago i tried tensioning the other way round Main 28 Cross 26lbs.
03-31-2005, 02:41 AM #28Originally Posted by Neil Nicholls
Last edited by SWC_Ant; 03-31-2005 at 02:43 AM.
03-31-2005, 03:00 AM #29Originally Posted by SWC_Ant
real example with BG66
I took a length of BG66 and hung 24lb of weight on it and measured the increase in length.
2570mm stretched to 2795mm
so a 240mm centre main would stretch to 261mm under 24lb tension
so how much extra tension do you think you'll get by stretching it another 0.6mm?
bit less than 0.6mm using BG66 though.
different strings would react differently though.
The stiffer the string, the bigger the difference.
So I would expect a smaller tension change with BG65 than BG66 because it is more stretchy
Last edited by Neil Nicholls; 03-31-2005 at 03:06 AM.
03-31-2005, 03:10 AM #30Originally Posted by Neil Nicholls
2570mm (0lb) => 2795mm (24lb), so 240mm (0lb) => 261mm (24lb), so each extra pound should increase the total length by 0.875mm, so 0.6mm would make the tension go up about 0.69 pound...
also, the BG 66 is probably one of the more stretchy strings, considering its only 0.66mm thick. if say BG 65 stretches less, then 0.6mm can easily equate to 1lb
edit: oh is BG 65 more stretchy? then im not sure.. maybe you should measure the BG 65 lengths for us too.. that would be great thx
03-31-2005, 05:31 AM #31
the values are (change in length) / (original length) per Kilogram tension
the 66 and 70pro where done quite a while ago, and I don't have any more lying around.
The 65, 80 and 68Ti were done today
It would be nice if someone else would have a go and see if they get anything similar.
03-31-2005, 05:42 AM #32Originally Posted by Neil Nicholls
i think it would be helpful if an experiment were conducted here at BC regarding string tension loss over say.. 1 month's time. i'll post about it (possibly in a new thread) tomorrow if im not busy
meanwhile, anybody else able to try this measuring thing would be helpful
03-31-2005, 05:55 AM #33Originally Posted by Neil Nicholls
03-31-2005, 09:40 PM #34
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