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

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» Troubleshooting
by stuckinthemud1 Sat Oct 01, 2022 3:08 pm

» Qin/Han lock drawings
by kenh Fri Sep 23, 2022 8:16 pm

» stirrup dimensions?
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» Skane/Lillohus lockbow information needed
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» need help contacting le musee Dauphinois Grenoble
by stuckinthemud1 Sat Aug 13, 2022 3:22 pm

» Low Draw Weight Build
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» Trigger testing Rig/Jig?
by ora8i Fri Aug 12, 2022 1:13 pm

» Collotiere a Charavines crossbow
by stuckinthemud1 Sat Jul 23, 2022 5:45 am

» Bad Antler
by stuckinthemud1 Tue Jun 28, 2022 8:09 am

» best type of horn to use..
by stuckinthemud1 Fri Jun 24, 2022 6:13 am

» Han Dynasty Chinese Crossbow
by hullutiedemies Fri Jun 17, 2022 1:00 pm

» Drawing of Crossbow
by stuckinthemud1 Fri Jun 03, 2022 3:01 am

» "How To Make Everything": Early Crossbow
by stuckinthemud1 Thu Jun 02, 2022 3:41 am

» Black inlay
by stuckinthemud1 Fri May 13, 2022 3:18 pm

» Roller nut details
by drawknife Thu Apr 21, 2022 2:44 pm

» 330#/7" wood bow
by Anatine Duo Tue Mar 29, 2022 11:08 am

» starting a 1400's replica
by stuckinthemud1 Thu Feb 24, 2022 1:26 pm

» 18th century German crossbow reproduction
by Fangbows Sun Feb 20, 2022 7:15 am

» replacement for baleen?
by tghsmith Mon Jan 17, 2022 9:30 am

» Josef alm in English
by stuckinthemud1 Fri Jan 14, 2022 3:07 pm

» Medieval crossbow finished
by stuckinthemud1 Wed Jan 12, 2022 3:05 pm

» Trigger mechanisms
by stuckinthemud1 Mon Jan 03, 2022 10:23 am

» Finish wooden stock
by stuckinthemud1 Sat Dec 25, 2021 9:06 am

» finish prod binding
by kenh Tue Nov 30, 2021 5:26 am

» What bolts do you use?
by hullutiedemies Mon Nov 22, 2021 9:43 am


2 posters

    Semi Ballista

    hullutiedemies
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    Post by hullutiedemies 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 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 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 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?



    Semi Ballista Untitled
    * *
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    ~ "All Genius is Simple"
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    Did you see my tool collection?


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    Semi Ballista Empty Re: Semi Ballista

    Post by hullutiedemies 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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