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

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» fix bolts
by chaz Yesterday at 2:27 pm

» Collotiere a Charavines crossbow
by stuckinthemud1 Thu Nov 19, 2020 1:00 pm

» New Build for 2020
by c sitas Tue Nov 17, 2020 5:47 pm

» how to Build a non Chinese repeating crossbow?
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» Fascinating reconstruction
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» Cutting delrin straight by hand?
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» Anyone make their own bolts?
by sydney1942 Wed Sep 02, 2020 3:03 pm

» Cocking via moving the bow.
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» Claw crossbow prototype
by Phil Abrahams Fri Aug 28, 2020 9:20 am

» Stirrups, how heavy? Design help needed
by stuckinthemud1 Tue Aug 18, 2020 2:24 pm

» ash lath and pin-lock crossbow
by stuckinthemud1 Tue Aug 11, 2020 2:31 pm

» Finish on lashings
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» Look what the smith sent
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» Covid 19 and crossbow builders
by kenh Thu Jul 30, 2020 10:22 am

» Crossbow accuracy
by Geezer Thu Jul 30, 2020 7:51 am

» How do you feel about miniature crossbows?
by El Zurdo Wed Jul 29, 2020 7:21 am

» Just finished my windlass crossbow!
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» Sinew backed crossbow prod tillering. Update and questions.
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» snakeskin not birch bark on composite bows in medieval period
by Cornerstone Mon Jul 27, 2020 3:50 pm

» two axle mechanism makers/accurate plans?
by stuckinthemud1 Wed Jul 22, 2020 10:34 am

» Stonebow Buildalong
by banuvatt Thu Jun 25, 2020 9:00 pm

» How to Attach a PVC Prod to a Stock?
by banuvatt Tue Jun 02, 2020 8:22 am

» finally started my first composite bow
by stuckinthemud1 Fri May 29, 2020 12:40 am

» AMAZING MINI CROSSBOW code name KillCovid-19
by El Zurdo Thu May 21, 2020 3:14 am

» Draw length ash lath
by banuvatt Thu Apr 23, 2020 9:47 am


    Semi Ballista

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    Post by hullutiedemies on Wed Dec 05, 2012 10:07 am

    Here is an easy and economical way to build a torsion engine
    Semi Ballista Veijo02_195
    Semi Ballista Veijo05_212
    Semi Ballista Veijo03_167

    Just tie two short skeins of cable
    Stick one end of a frame bar and throwing arm through the loop of the skein.
    Twist both arms one turn and string

    This thing pulls about 40#/7"
    It puts an airsof pellet into a card board box
    and a .17 BB through the box.


    Torsion spring here is manilla rope.
    1 gram of manilla can take 2 Joule load before failing - about as good as rubber band.
    About as goot as biomaterial goes.

    Other cable materials can of course be used.
    I have tested this system eg. with old woolen socks.
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    Post by Ivo on Wed Dec 05, 2012 1:54 pm

    I have tested this system eg. with old woolen socks.

    Semi Ballista 576186 Semi Ballista 576186 Semi Ballista 576186

    Not sure if you were going for laughs there, but you certainly succeeded and then some...

    This little ballista is actually really cool...three sticks, two socks, a shoe lace or the like for the string....damn, that's good stuff, haha!

    I've been flooded with *want* with similar ideas...I really like seeing shapes in things created by nature...and one thing the comes to mind is using a trunk of a tree with two branches serving as riser ends to mount limbs/levers on for a reverse draw crossbow (call it ~ Log Bow maybe jocolor)....and this little engine fits so well with the concept.

    Semi Ballista Log_bo10

    Do you plan on taking it a bit further or is this more of a research type of build for information and inspiration? cyclops

    Ivo



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    Post by hullutiedemies on Sat Dec 08, 2012 10:55 am

    Ivo wrote:Do you plan on taking it a bit further or is this more of a research type of build for information and inspiration?

    This was originally intented just for proving the concept and testing materials.
    But it worked so well that I need to re-build it. With properly shaped riser and trigger. This should make a fun pistol type pellet bow for backyard plinking.
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    Post by Ivo on Sat Dec 08, 2012 6:30 pm

    Good to hear! drunken Definitely looking forward to seeing it, would make my day!

    Ivo

    PS: Cool avatar...did you encounter any examples of that kind of chukonu in reality?



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    Did you see my tool collection?


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    Post by hullutiedemies on Mon Dec 10, 2012 10:06 am

    Ivo wrote:PS: Cool avatar...did you encounter any examples of that kind of chukonu in reality?

    Thanks ,
    I have made one.
    I have not published any pictures yet, as it is still undergoing field testing and has mildly put "somewhat unfinished" appearance.

    My own primi-compound system with chuko-action and magazine spring, so it can be shot sideways.

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