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Thread: Question for tuning gurus

  1. #1
    hunt123
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    Default Question for tuning gurus

    What is the optimum cam location on a '10 Bengal? I twisted up my cable and got the ATA set exactly to factory spec 32 1/4". At that spec, there is about 1/4" of open groove on the ball end of the cam between the end of the groove and where the string hits the cam.

    Is that optimum or is there a different distance like maybe 3/8" that's better? Where the cam turns over is maybe more important than having an exact ATA and I'd like to get it correct. I can't find any Martin data on it.

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    My 09 has 32 1/4 ATA The distance squared from the string to the upper end of the exposed part of the groove is 5/16 of an inch.. If that helps ???
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  3. #3
    hunt123
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    Quote Originally Posted by Sagittarius View Post
    My 09 has 32 1/4 ATA The distance squared from the string to the upper end of the exposed part of the groove is 5/16 of an inch.. If that helps ???
    Pretty close to mine. Just 1/16 more. I guess that's probably what you get if you set up a factory spec ATA. But what I want to know is: is that really optimum or would it be better in some way to make it a little more or a little less.

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    Administrator bfisher's Avatar
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    Quote Originally Posted by hunt123 View Post
    Pretty close to mine. Just 1/16 more. I guess that's probably what you get if you set up a factory spec ATA. But what I want to know is: is that really optimum or would it be better in some way to make it a little more or a little less.
    The best way to answer your question is for you to play around with cam position and find out. #1 you should have a chronograph to check speed differences. #2 you have to shoot gor groups to see if there is a sweet spot that suits you and your bow. There just aren't many hard and fast rules about it.
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  5. #5
    hunt123
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    Quote Originally Posted by bfisher View Post
    The best way to answer your question is for you to play around with cam position and find out. #1 you should have a chronograph to check speed differences. #2 you have to shoot gor groups to see if there is a sweet spot that suits you and your bow. There just aren't many hard and fast rules about it.
    Wish I had a chrono or even access to one. Guess I'll have to do it the laborious way.

  6. #6
    Destroyer
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    Quote Originally Posted by bfisher View Post
    here just aren't many hard and fast rules about it.
    Exactly right. My bow tunes easier with less rotation but is a bit slower. There have been quite a few threads here about the very subject.

  7. #7
    hunt123
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    So lets see if I'm understanding everything right. Factory spec is only a starting point and you work from there.

    If your string and cable are the correct length and are good quality so they don't keep changing length, then you just adjust your cable one way or the other until the bow shoots good. Forget what the factory ATA is.

    No need to mess with the string unless your peep starts twisting.

    Stuff like centershot, loop height, peep location, etc. isn't under discussion right now. Just assume all that is correct.

    Right? I'm never going to get to "Crackers" level, but I'd like to get better than I am!

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    Senior Member elkslayer4x5's Avatar
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    Quote Originally Posted by hunt123 View Post
    So lets see if I'm understanding everything right. Factory spec is only a starting point and you work from there.

    If your string and cable are the correct length and are good quality so they don't keep changing length, then you just adjust your cable one way or the other until the bow shoots good. Forget what the factory ATA is.

    No need to mess with the string unless your peep starts twisting.

    Stuff like centershot, loop height, peep location, etc. isn't under discussion right now. Just assume all that is correct.

    Right? I'm never going to get to "Crackers" level, but I'd like to get better than I am!
    You're going the correct way, ask questions, try things out, if in doubt, ask more questions. You 'mess' with both string and cables. Have you read Ehunter's post "New string/cables ? See post #3.
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    Thumbs up rh stage 2

    sounds like hes gonna crack a limb to me lol

  10. #10
    hunt123
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    Quote Originally Posted by polaris754 View Post
    sounds like hes gonna crack a limb to me lol
    I'm not amused. Martin's already replaced at least 3 sets, none of which were my fault. All had to be replaced before I started messing with tuning.

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