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

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5 posters

    Material For Swinging Crossbow Limbs

    avatar
    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!


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    Post by benjaminh123 Fri Feb 27, 2015 1:19 pm

    First topic message reminder :

    I need recommendations for swinging crossbow limbs. The bow will be about 200lbs draw. I was thinking 1/2" aluminium; is this overdoing it? I'm guessing delrin is to weak?
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    c sitas
    Crossbow Junkie

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    Crossbow JunkieI live here!


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    Post by c sitas Fri Mar 13, 2015 7:10 pm

    I miss wrote my last post . I meant to say the material was 1.25 square "TUBE stock ".Wall thickness was about .060. Your 1" might work if you could  some how mount your wheels to pull on the center of the bar. Jeep and I also mounted them on top , had trouble twisting. That is why I went with the tube stock , cause I could easily mount in the center . In my case the stock was cheaper also.
    avatar
    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!


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    Join date : 2015-02-23

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    Post by benjaminh123 Fri Mar 13, 2015 8:48 pm

    Ivo once said:
    "If you checked out Igora's bow powered in-swinger ballista, he suggested using a flat strip as a lever. >>> Igora's Ballista Perv. Material For Swinging Crossbow Limbs - Page 2 Icon_smile

    This kinda makes sense:


    • Less air resistance.
    • Improved rigidity along the x-axis
    • and...perhaps Less weight. >>>BTW What are the dimensions of the Firefly ballista's levers? how much do they weigh?


    I also would like to add that doubling the strips with spacers in between might be a good idea...a sheet/plate frame of sort.


    Enlarge this image Click to see fullsize
    Material For Swinging Crossbow Limbs - Page 2 Flippe12

    ...the lever in the picture is from a different project, so it doesn't fully apply to our ballista discussion...yet still has a few details that I wanted to mention)

    Perhaps the levers will weight a tad bit more, but rigidity will improve along other axis as opposed to just flat plate version. The tip being a wheel instead of a knock is another good thought."


    I was thinking of maybe using two 1/8x1" aluminium bars with my pulley/nock in between layers. How does this sound? The reason I would like to avoid the square tube is because it adds air resistance, and it is much more expensive in my area than flat bar stock. Please keep in mind the draw weight I am after would not exceed 150lbs;
    Can anyone comment on my list of dimensions?
    How has your inswinger been performing chuck?
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    c sitas
    Crossbow Junkie

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    Crossbow JunkieI live here!


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    Post by c sitas Sat Mar 14, 2015 1:52 pm

    Yes I like the way mine shoots. Your double setup would work,BUT be heavy. Maybe such a thing one could use lightning holes to help.In effect ,with the two pieces you have created a beam that will resist any unwanted flexing.I'm wondering if two pieces of 1/16 steel stock wouldn't be lighter and just as strong as long as you keep the pulls and pivots in the center. Also the length of it could come into play.The way mine is strung and the way it pulls, I more or less have to use the wheel. I don't believe it turns hardly at all. It just makes less trouble pivoting.I really never paid any attention to what is best . I new what I wanted ,and just made it.It's a test bed. I'm on my fifth stock for it. It's easier for me to make a stock than putts with the trigger hole, and that's what I've been doing, making different triggers. I'm liking the china version now.

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