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Thread: Help Please - Trying to Tune a Fire

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    Senior Member Six Point MAG00's Avatar
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    Default Help Please - Trying to Tune a Fire

    I began trying to tune my Fire by using the guidelines mentioned in Dave Nowlin's sticky thread. I used a draw station to check the cable stops and draw stop.

    I first watched the cable stops in relation to their corresponding cables and twisted one and untwisted the other until I got the cable stops to hit the cables at the same time.

    I then set my draw stop so that it just touched the limb face with the cable stops approximately 1/16th inch from the cables. Which when pulled to full draw the cable stops just touched the cables.

    Here's my problem....I have the #5 module 5.1=26" and when I measure my draw length from the throat of the grip to the "peak" of the string it only measures approximately 25 1/8".

    What am I doing wrong? Where do I go from here? Do I untwist the cables some more? Do I untwist the string? Please help!

    I have not been able to check draw weight and let-off yet. I ordered a scale, but it has not arrived yet.
    Last edited by MAG00; 07-22-2008 at 08:58 AM.

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    Respected Member Ten Point Stag Scablands's Avatar
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    You have to add 1.75" to the 25.125" for AMO draw length = 26.875" is where your draw is now if I'm reading you correctly?

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    Senior Member Six Point MAG00's Avatar
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    So when I measure my personal draw length and I get 26", do I not measure that against the draw on the bow from the throat of the grip to the string? I know AMO you add 1.75 to this measurement.

    I guess I may be a little confused. If I have the 26" module installed then when I pull to full draw I should only be 24.25" from the throat of the grip to the string?

  4. #4
    Moderator Stag Maybee-R's Avatar
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    Quote Originally Posted by MAG00 View Post
    So when I measure my personal draw length and I get 26", do I not measure that against the draw on the bow from the throat of the grip to the string? I know AMO you add 1.75 to this measurement.

    I guess I may be a little confused. If I have the 26" module installed then when I pull to full draw I should only be 24.25" from the throat of the grip to the string?
    This is correct.
    No ifs and or buts Just maybee.

  5. #5
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    How is your draw weight?
    Sounds like you might have quite a bit of twisting to do.

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    Respected Member Ten Point Elite_Kevin's Avatar
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    Your draw stop is probably set too far and this is adding to the draw length. Check to see what you are holding with hysteresis.

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    Senior Member Six Point evworld's Avatar
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    Quote Originally Posted by Elite_Kevin View Post
    Check to see what you are holding with hysteresis.
    What does this mean???? And How would you do it???

  8. #8
    Respected Member Ten Point Stag Dave Nowlin's Avatar
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    Kevin you're going to have to quit using those bad words. You are confusing people.

    Dave Nowlin
    Murphy's Law Works Even Better In The Woods!!!
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  9. #9
    Respected Member Ten Point Stag DOAGuide's Avatar
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    A system with hysteresis can be summarised as a system that may be in any number of states, independent of the inputs to the system. To be exact, a system with hysteresis exhibits path-dependence, or "rate-independent memory"[citation needed]. By contrast, consider a deterministic system with no hysteresis and no dynamics. In that case, we can predict the output of the system at some instant in time, given only the input to the system at that instant. If the system has hysteresis, then this is not the case; we can't predict the output without looking at the history of the input. In order to predict the output, we must look at the path that the input followed before it reached its current value.
    Many physical systems naturally exhibit hysteresis. A piece of iron that is brought into a magnetic field retains some magnetization, even after the external magnetic field is removed. Once magnetized, the iron will stay magnetized indefinitely. In order to demagnetize the iron, it would be necessary to apply a magnetic field in the opposite direction. This effect is exploited commercially; for example, it provides the element of memory in a hard disk drive.
    Human-designed systems will sometimes intentionally exhibit hysteresis. For example, consider a thermostat that controls a furnace. The furnace is either off or on, with nothing in between. The thermostat is a system; the input is the temperature, and the output is the furnace state. If we wish to maintain a temperature of 20 degrees, then we might set the thermostat to turn the furnace on when the temperature drops below 18 degrees, and turn it off when the temperature exceeds 22 degrees. This thermostat has hysteresis. Let us say that the temperature is 21 degrees. Given this information, we cannot predict whether the furnace will be on or off; it's not possible to predict the instantaneous output of the thermostat, knowing only its instantaneous input.
    The term derives from an ancient Greek word υστέρησις, meaning "deficiency", or "lagging behind". It was coined by Sir James Alfred Ewing.

    CLEAR AS MUD

  10. #10
    Respected Member Ten Point Stag Dave Nowlin's Avatar
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    This explanation is very clear with regards to the operation of the thermostat but sheds little light on it's application to a compound bow. It is interesting reading though and is one more bit of trivia I have now filed away. Now try it, that is explain it in a very clear way which aaplies to the problem at hand.

    Dave Nowlin
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