String Twist?
08-25-2007, 12:25 PM
#1
Fork Horn
Thread Starter
Join Date: Feb 2006
Location: Jackson, Ohio
Posts: 345
String Twist?
Just wondering how you eliminate string twist? Brother-in-law is having some trouble with this. Every time he draws he cant see through his peep sight. Any help is appreciated.
Thanks In Advance, Andrew14
Thanks In Advance, Andrew14
08-25-2007, 03:15 PM
#2
Nontypical Buck
Join Date: Feb 2003
Location: Middletown PA United States
Posts: 3,625
RE: String Twist?
You can move strands from one side to the other till you get the peep to rotate to the desired position. Most of us refer to this as training the string. It works but isn't the correct way to do things. It's usually only temporary.
The reason the string twists in the first place can be one or more things. One is that the string was not made properly. It wasn't stretched before serving so each strand is of a slightly different length. When put under pressure of shooting each of the shorter strands is going to creep (not stretch) until they are al the same length and doing equal work. During this time the string will be unstable and peep rotation will continue. Also the bow will be slightly changing it's tune.
On most single cam bows the string is longer than the cable so will creep approximately twice as much as the cable. Therefore the draw length gets longer, the cam gets out of it's optimum shooting position, and the draw weight goes up.
YOu an remedy this by removing the string and twistingthem back to their proper length. Set the bow in specs.
Secondly, even if a string is made of the best material it must be made a little longer than it's specified length and then twisted down to tht length. This becomes trial and error for amateur string makers till they become used to it. Anyway, how many twists should a string/cable have in it? Those who make good strings know that it is about 1 twist per each 1 1/2"of the string. Figure it out. That means about 75 twists in a 100" string.
I used to work in a shop and a lot of bows, especially lower priced bows have as little as 5-10 twists in them. That's just one of the reasons they are less expensive.
What's all this twisting do? It wraps the strands togerther in a tighter bundle and makes them all work as a unit. Take a look at any rope or steel cable that you can find. The same priciple applies to both.
This also where aftermarket string makers shine. Most wrap the strands on a jig. Then they twist them up and then put them under several hundred pounds of pressure to "pre-stretch" them. Then they are served under pressure. The end results is a string that is very stable. Once shot in they will not creep anymore. Your bow will not change it's tune. And lastly, once set your peep will draw straight back with no rotation whatsoever.
Sorry to be so long winded, but I'm making a case for decent aftermarket strings. Almost any are superior to most factory strings.
The reason the string twists in the first place can be one or more things. One is that the string was not made properly. It wasn't stretched before serving so each strand is of a slightly different length. When put under pressure of shooting each of the shorter strands is going to creep (not stretch) until they are al the same length and doing equal work. During this time the string will be unstable and peep rotation will continue. Also the bow will be slightly changing it's tune.
On most single cam bows the string is longer than the cable so will creep approximately twice as much as the cable. Therefore the draw length gets longer, the cam gets out of it's optimum shooting position, and the draw weight goes up.
YOu an remedy this by removing the string and twistingthem back to their proper length. Set the bow in specs.
Secondly, even if a string is made of the best material it must be made a little longer than it's specified length and then twisted down to tht length. This becomes trial and error for amateur string makers till they become used to it. Anyway, how many twists should a string/cable have in it? Those who make good strings know that it is about 1 twist per each 1 1/2"of the string. Figure it out. That means about 75 twists in a 100" string.
I used to work in a shop and a lot of bows, especially lower priced bows have as little as 5-10 twists in them. That's just one of the reasons they are less expensive.
What's all this twisting do? It wraps the strands togerther in a tighter bundle and makes them all work as a unit. Take a look at any rope or steel cable that you can find. The same priciple applies to both.
This also where aftermarket string makers shine. Most wrap the strands on a jig. Then they twist them up and then put them under several hundred pounds of pressure to "pre-stretch" them. Then they are served under pressure. The end results is a string that is very stable. Once shot in they will not creep anymore. Your bow will not change it's tune. And lastly, once set your peep will draw straight back with no rotation whatsoever.
Sorry to be so long winded, but I'm making a case for decent aftermarket strings. Almost any are superior to most factory strings.
