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    Complex crossbow triggers by Da Vinci

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    HeroSK
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    TinkererIf there is a will, there  is a way.

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    Complex crossbow triggers by Da Vinci

    Post by HeroSK on Sat Jan 03, 2015 1:21 am

    Hi all,

    I just found this from Codex Madrid dated to 1493.


    mac
    Master Weaponsmith
    Master Weaponsmith

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    Re: Complex crossbow triggers by Da Vinci

    Post by mac on Sat Jan 03, 2015 10:08 am

    Now I am going to say something heretical. 

    The lock on the right will not work as drawn.  There are two problems.  The first is the angle of the locking surface of lever 2 (counting from the nut).  It needs to be less than 90 degrees to the line drawn from the pivot to the face.  This face needs to be a sort of "ramp" so that the motion of lever 1 will cause lever 2 to rotate.  This is a small thing and can be easily adjusted.

    The second problem is more difficult to fix.  The left end of lever 2 must lift the hook in the middle of lever 3.  If we follow the arcs that Leonardo has conveniently provided, we see that it will jam under the hook before it can travel far enough to allow lever 1 to clear the working face of lever 2. 

    If I remember correctly, the text says something about lever 2 "breaking", so I assume the Leonardo realized that there was a problem, but had not gotten around to drawing a fix for it.

    Mac

    Rizzar
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    Re: Complex crossbow triggers by Da Vinci

    Post by Rizzar on Sat Jan 03, 2015 12:22 pm

    Hey guys!

    Some time ago I´ve heard about Da Vinci´s drawings.
    It was stated that he was building errors into them to prevent stealing his ideas.

    Old copyright protection^^
    Could be in this case, too.

    Rizz

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    Re: Complex crossbow triggers by Da Vinci

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