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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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2 posters

    Trigger mechanisms

    stuckinthemud1
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    stuckinthemud1
    Crossbow Junkie

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    • Post n°1

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    Post by stuckinthemud1 Wed Dec 29, 2021 3:19 pm

    I am planning my next build and could do with some design help for a mechanism.  Can anyone point me to (or post) some multi axis designs suitable for an early/mid 16th century crossbow?

    I am also puzzling about double set triggers, has anyone got any plans/photos of this kind of mechanism?

    Thanks

    Andrew
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    tghsmith
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    • Post n°2

    Trigger mechanisms Empty Re: Trigger mechanisms

    Post by tghsmith Fri Dec 31, 2021 10:07 am

    both the crossbows in the royal netherlands army museum and the hornbogenarmbrust have good drawings of several types. if you can't get your hands on them pm me your email..
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    tghsmith
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    • Post n°3

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    Post by tghsmith Sun Jan 02, 2022 12:16 pm

    sent you two emails, my workings with a 3 pivot mech. showed me that building the unit on a flat board/plate and then transferring the centers to the tiller block while it is still square.. hard to fine tune the parts when you can't see whats going on..
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    Post by stuckinthemud1 Sun Jan 02, 2022 3:23 pm

    Thank you so much. I'm most grateful
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    • Post n°5

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    Post by stuckinthemud1 Mon Jan 03, 2022 7:30 am

    So, when you made your mechanism, I guess you used mild steel and then hardened it?  What thickness material did you use? Also, how did you work out how strong the springs needed to be? Thanks in advance,
    Andrew
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    tghsmith
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    • Post n°6

    Trigger mechanisms Empty Re: Trigger mechanisms

    Post by tghsmith Mon Jan 03, 2022 9:45 am

    my 3 pivot has no springs, all mild steel that will have the contact points hardened.. all 3/8" thick..no springs. start saving junk that had springs so you will have many strengths to try..  Myself, I would work out all the parts in 1/8th pvc/plastic sheet before steel..I turned the test pivot pins with points so the final hole centers could be easy to transfer,, I have a bench top milling machine so my parts are dead-on square. a machine shop with a waterjet or other cutter could make quick work of cutting true parts.. 
    https://2img.net/r/ihimizer/v2/640x480q90/922/zsLHEW.jpg
    https://2img.net/r/ihimizer/v2/640x480q90/922/mw4t6v.jpg
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    • Post n°7

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    Post by stuckinthemud1 Mon Jan 03, 2022 10:23 am

    That's a nice set-up, I'm very jealous :-D  
    I love the idea of the sharp pivots, Think I need to start saving up, I suddenly feel the need for a milling machine...
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