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Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

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» 12th Century Chinese Crossbow Chronographed
by stuckinthemud1 Fri Nov 24, 2023 3:50 pm

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» [solved]Skane/Lillohus crossbow thread
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5 posters

    Pins in Trigger Mechanisms

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    banuvatt
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    Post by banuvatt Mon Oct 28, 2019 5:06 pm

    Pins in Trigger Mechanisms Lockfi13
    This is by no means my design, but I really liked it. Ivo posted it on one of Gnome's posts I thought I might use it. One question I had was whether the two pins with the red outline do they have any functional use? I know the bottom one to the top left of the trigger could keep it from moving forward, but how about the one in between the nut and the blue highlighted pin on the middle piece of the trigger mechanism?
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    Post by kenh Tue Oct 29, 2019 4:58 am

    The one in front of the trigger prevents the trigger from coming forward.  The one above the sear keeps the sear arm in place until the notch in the roller comes back around and catches again.
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    Post by Andy. Tue Oct 29, 2019 2:33 pm

    Yes, the bottom one prevents trigger moving forward, but top is superfluous, as the nut itself keeps the tickler arm in place (assuming the arrow notch in nut wont foul its rotation when cocking)
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    Post by Wildtech Tue Oct 29, 2019 2:51 pm

    The Top pin is used to hold tension on the arm and spring until you have installed the nut so the spring doesn't fall out.  I have had to use this on other Crossbow designs.
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    Post by banuvatt Tue Oct 29, 2019 4:01 pm

    This is kind of unrelated, but it relates to the trigger is the small gap in between the top of the trigger and the lever supposed to be there? Or is it just there to show that the trigger and the lever are separate parts?
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    Post by Andy. Wed Oct 30, 2019 3:07 pm

    I reckon to show that they're separate parts.

    Some triggers of this type however, have a small raised portion in the trigger at the bearing surface with the top lever to reduce surface contact/friction between both parts.
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    Post by banuvatt Wed Oct 30, 2019 3:32 pm

    I was thinking if that gap wasn't there wouldn't the trigger mechanism just function as one part rather than two? Now I am thinking it was the latter of what you said.
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    Post by Gnome Sat Nov 02, 2019 3:49 pm

    Ha! That takes me back. That image was a diagram of my first attempt at a crossbow lock mechanism, which Ivo modified to show me how to make it maybe actually sort of functional. The point was mechanical advantage, the line between the parts was drawn because originally it was just one part with negative advantage. The stop-posts were a suggestion that did not prove necessary.
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