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    A little bit of help

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    primuspilus
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    A little bit of help

    Post by primuspilus on Wed Aug 15, 2012 3:30 am

    Hello....I'm new here and I've decided to build a medieval like crossbow. So far I've made the bow using a spring steel leef from a car. It is 72 cm. long, 4 cm. wide at the midlle and 2 cm. at the nocks. The steel is 4mm.thick. I've drown it at 200lbs. with a draw length at 15" using my archery tillering tree. My questions are: It is safe? I'm planning to use a simple(medieval) trigger mechanism with a roller nut and a trigger. The grip..can be made a little curved(like a modern era pistol)? I've once shot a medieval crossbow and even if it is very cool I find it difficult to shoot from the shoulder (the stock being straight). Can I make the nut out of ipe wood instead of steel?? I hardly wait for your answers...thank you....


    By mihainicolescu at 2012-08-15


    By mihainicolescu at 2012-08-15


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    jds6
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    Re: A little bit of help

    Post by jds6 on Wed Aug 15, 2012 6:38 am

    Greetings, welcome to the forum.
    Ipe wood is a very dense hardwood from Brazil. It is used widly for decking due to its durability and life(25 years outside). I am no expert on wooden roller nuts but have made a couple from walnut. So I guess if your able to work and shape the nut and fingers it may just work. Maybe someone on the forum with more experience will respond. Good luck, and thanks for the pics. By the way, what kind of wood are you using for the tiller?

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    Todd the archer
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    Re: A little bit of help

    Post by Todd the archer on Wed Aug 15, 2012 3:03 pm

    I have made several nuts from Walnut. I have made mine 1 1/2" wide this is some what wider than usual. I have used them on crossbows with 150 pound prods. The main thing is to make it with the grain running vertical (when in the cocked position) for strength.





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    mac
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    Re: A little bit of help

    Post by mac on Fri Aug 17, 2012 8:56 am

    Primus,

    The medieval crossbow is shot from the cheek, rather than from the shoulder. Crossbows have very little recoil, so there is no need to brace them against the shoulder.

    Grab the tiller with your thumb on top. Place your thumb under your cheek bone.

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    Kale Schlegel
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    Re: A little bit of help

    Post by Kale Schlegel on Fri Aug 17, 2012 12:48 pm

    Just make sure , for wear and tear, for that pound of crossbow you're going to have to put in a little piece of steel where the trigger connects to the nut (Todd the archers picture above).That's if you didn't know that already , but I digress...

    primuspilus
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    Re: A little bit of help

    Post by primuspilus on Sun Aug 19, 2012 12:37 am

    thank you for your help. 15inch of draw lenght is safe for my bow lenght? Is there any relation ship betewn the draw lenght and the dimensions of the bow?

    Tehartificer
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    Re: A little bit of help

    Post by Tehartificer on Sun Aug 19, 2012 7:43 am

    At least as far as traditional bows are concerned, a well tillered bow should draw to approximately half it's total length. 15 inches would probably be pushing things, but having not completed my first crossbow, I can't really say if this rule would apply.
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    Kale Schlegel
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    Re: A little bit of help

    Post by Kale Schlegel on Tue Aug 21, 2012 5:38 pm

    One thing to take into account is the width of the crossbows body. Say those generic 150 lb limbs, on Jasonwemp's videos he stated it was harder to draw back because the limbs were designed for a 1-3/4"? thick crossbow and his was thicker, resulting in a harder pull.

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