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Thread: Limb string groove

  1. #1
    In the White
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    Limb string groove

    Whilst my son was trying out a new set of limbs I noticed on my sons usual limbs that the lower limb string grove has been extended by nearly an inch.
    It would appear that the string is cutting into the limb I assume after the release. There are no marks on the upper limb.
    The loop serving is longer than the groove so it must be the serving doing this.

    At rest the string does not contact the limbs below the groove on top or bottom. There is no noise on arrow release.
    Bracing height is at 9” . The tiller measures 7 4/8” top and 7 2/8th” bottom. Giving 2/8ths tiller on the top limb.
    The riser is a 27” Hoyt Factor with X Tour long limbs 38lbs.

    Ive experimented with a different set of limbs with some tape in the lower groove and the string also leaves marks on this tape
    below the groove. So I don’t think it’s a difference in the limbs
    Would this mean that the lower limb is working more or less, than the upper limb even though the flight of the arrows are good and group. I would have thought that if the limb setup is right any the marks on the limbs would be the same top and bottom.
    We’ve tried a higher bracing height during tuning but it always seems to work best at 9”.

    I was surprised to find that on winding the limbs fully in and measuring the tiller top and bottom, that the tiller measurement were not at zero to each other. So I assume that that’s due to the riser geometry and built in.

    We could of course leave “sleeping dogs lie”.

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  3. #2
    In the Red
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    You are at the bottom end of the recommended brace height at 9", might be worth wniding it up to 9.5" and repeating the tape exercise. This would prove if its a low BH issue?

  4. #3
    It's an X
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    I noticed on my sons usual limbs that the lower limb string grove has been extended by nearly an inch.
    When you say "Extended" do you mean the groove is longer than the one in the top limb? Or is the bottom groove getting longer over time? Does the extra length in the lower groove look like recent wear or could it have been made longer by the factory.( accidentally perhaps?)

  5. #4
    It's an X Del the Cat's Avatar
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    Generally a lower limb is adjusted to be slightly stiffer than the upper (by tightening the limb bolt a little more). This would make the string contact the limb for a longer distance.
    I don't think its an issue, the grooves are possibly filed in manually.
    Does the string sit nicely in the groove after a shot? If so there is no problem. The groove is only there to discourage the string from working it's ways sideways off the limbs during the vibration at the end of the shot... it's one of the perils of highly recurved limbs.
    Del
    Health Warning:- These posts may contain traces of nut.

  6. #5
    In the White
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    The groove has extended is from wear.

  7. #6
    In the White
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    The string sits in the groves top and bottom with no problems. I just wonder why the lower limb has more wear than the upper.

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