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    Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

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    stm2010
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    Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

    Post by stm2010 on Mon Jul 18, 2016 12:31 am


    Whole profile




    Left hand holding section


    Dragon head with four teeth



    Cocked state 


    Crossbow body and the section for holding the bamboo bow.


    Two cloud shaped plates prevent the horizontal displacement of magazine 


    bolts materials


    The iron head of bolts




    The end of bolts are  cross shape curved. It will help the string hit the center line of bolt.



    A top plate can pull out and push into the magazine, help prevent the jumping of bolts.





    Drill a hole for insert the trigger (Top is wider than below.)


    Insert the trigger pin.


    Cut out a shallow path for bolts



    The boundary slot for holding string is curved out to a "U" shape.


    Using round chisel to cut the barrel


    Check and test the hitting 


    Cut out room for stacking bolts


    Hold the two pieces together


    Insert a short stick into the mouth of dragon prevent the sliping out the bolt while carrying.



    Design the operation lever. (need  adjustments )



    Using cheap bamboo as bow


    Polishing the bamboo bow



    Two piece bamboo plates tie together.




    Curve out the dragon head.




    Using a littel magnet under the  iron head of bolt avoid sliping.



    Making string





    Assemble and painting.

    stm2010
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    Re: Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

    Post by stm2010 on Mon Jul 18, 2016 12:42 am


    As can be seen above, the red arrow head line means the force of string F1 and hand operate force F2, L2 is about 10 times of L1. That means if the bow is 200 pound when full cocked,the operate force may one tenth of bow (20 pound). This result is very intersting since the proportion of cock lever is changed during operating.  






    Little Chu ko nu model
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    kenh
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    Re: Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

    Post by kenh on Mon Jul 18, 2016 5:38 am

    Very nice tutorial!  And beautifully done Dragon Bow!
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    Gnome
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    Re: Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

    Post by Gnome on Tue Jul 19, 2016 5:22 am

    Very nice indeed! One of these days...
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    Re: Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

    Post by c sitas on Fri Jul 22, 2016 8:07 am

    Very good posting . Very clear. Would you have any idea as to how many man hours it takes to make it?In real action ,you can see how very deadly it could be.Thanks for your effort in this.
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    Re: Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

    Post by actionbow on Fri Nov 25, 2016 12:20 pm

    Love the magnet idea! I use two little brushes at the muzzle but this is much better.
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    El Zurdo
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    Re: Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

    Post by El Zurdo on Fri Nov 25, 2016 2:51 pm

    Very nice work, I also love the idea of magnets to keep the bolt plated and the end of bolts in cross shape curved. 

    I maked a Chu Ko Nu dragon 5 years ago but on a smaller scale 1/4. Mine was ebony and boxwood carved with a multi-bamboo bow.
    It always works perfectly.


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    Re: Chu Ko Nu (Zhu ge nu) chinese repeating crossbow making process from china

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