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    Anyone ever built one of these?

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    Lien93
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    Anyone ever built one of these?

    Post by Lien93 on Wed Sep 12, 2012 2:47 pm

    So far i've got the bow, upper machanism, stock and sights ready, but does anyone have a picture of the internal trigger mechanism?

    Im building something similar to this


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    Re: Anyone ever built one of these?

    Post by jeep on Thu Sep 13, 2012 4:40 am


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    Re: Anyone ever built one of these?

    Post by jeep on Thu Sep 13, 2012 4:42 am

    to get the complete picture click in.

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    Re: Anyone ever built one of these?

    Post by chaz on Thu Sep 13, 2012 6:33 am

    Pretty dang cool !!!!!

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    Re: Anyone ever built one of these?

    Post by Lien93 on Thu Sep 13, 2012 8:35 am

    Thanks, this helps a lot
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    Re: Anyone ever built one of these?

    Post by Geezer on Thu Sep 13, 2012 8:40 am

    The device in question is a 'schnepper', or stonebow. Given the pattern, I would say it's probably German in origin I have made Italian and Spanish stonebows in the past. Be aware, it is possible for double-string stonebows to reverse their strings and shoot the ball BACKWARDS into your eye. I know this from personal experience. At least in the testing phase, you should wear some sort of face-shield when shooting. Better yet, build a single-string 'bullet bow' of the sort that projects the ball down an enclosed tube, like a gun barrel. A slurbow-type top-plate can achieve the same purpose. This isn't to say you shouldn't build one of these nifty things, just be aware of the possibilities. Geezer

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    Re: Anyone ever built one of these?

    Post by Lien93 on Thu Sep 13, 2012 8:59 am

    I think a big rear sight would solve the problem with a ball in the eye, but then again shit happens...
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    Re: Anyone ever built one of these?

    Post by Geezer on Thu Sep 13, 2012 9:38 am

    A big rear sight? Yup, indeed most of the stonebows I have seen have some sort of big sight. On these all-iron German types, it's just a sort of pie-pan peep sight. On Italian bows, they often had a carved beastie with slots or peep-holes to look through. They look pretty spiffy. Geezer.
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    Re: Anyone ever built one of these?

    Post by mac on Thu Sep 13, 2012 11:14 am

    Geezer wrote: Be aware, it is possible for double-string stonebows to reverse their strings and shoot the ball BACKWARDS into your eye. I know this from personal experience. At least in the testing phase, you should wear some sort of face-shield when shooting. This isn't to say you shouldn't build one of these nifty things, just be aware of the possibilities. Geezer

    Geezer,

    What went wrong with the bow that tried to blind you? Have you ever tracked down what the problem was? This sort of behavior can not be typical of these bows, or no one would ever have made the second one.

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    Re: Anyone ever built one of these?

    Post by Geezer on Thu Sep 13, 2012 11:25 am

    What went wrong with the Spanish stonebow? A number of contributing factors. First, the bowstring was a bit too long, second, the prod was mounted a bit too close to the top of the stock... Spanish stonebows curve down between the prod and the lock, but not so profoundly as Italian bows do. The string being too long, and the knots holding the leather ball-cup being a bit large, the string touched the top of the stock just behind the prod. The string rotated 180 degrees, just as it came to full stop, so instead of throwing the ball forward, it cast it backward (with somewhat less power, fortunately) directly through the lense of my spectacles and into my right eye. I got an eye full of glass-fragments and ruptured the sphincter-muscle that controls the pupil-size. Now years later, my right eye is very sensitive to light and vision is a bit worse than the left eye (not too great in either) On the positive side, since the pupil won't contract very much (takes on a 'D' shape) I have much better night-vision in my right eye than in the left. However, I don't recommend the alteration. No fun at all. Thanks to my misadventure, I went out of the stone-bow market entirely, but I'll admit they can be made safe, and they ARE rather fun. Geezer
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    Re: Anyone ever built one of these?

    Post by mac on Thu Sep 13, 2012 12:05 pm

    So....it looks like it is of the greatest importance that the string not be able to touch any part of the tiller. That makes good sense.

    Do you happen to have a pic of the bow in question.....or did you send its treacherous ass through the band saw before taking any pics? It would be good to be able to see an image of a bow that is known to be dangerously unstable, just to get a feel for what trouble looks like.

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    Re: Anyone ever built one of these?

    Post by Geezer on Thu Sep 13, 2012 2:55 pm

    I don't have pictures of it, but the pattern was a Spanish stonebow sketch I found in Harmuth's Die Armbrust. It's a lot like the bent Italian stonebows, but the curve in the fore-stock isn't nearly so pronounced... in fact, it's just enough to clear the string... or not as the case may be. Geezer

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    Re: Anyone ever built one of these?

    Post by chaz on Thu Sep 13, 2012 5:50 pm

    Geezer,

    You were quite fortunate to come out as well as you did ............... I can think of another sphincter-muscle that such an experience could have affected.

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    Re: Anyone ever built one of these?

    Post by Todd the archer on Thu Sep 13, 2012 6:43 pm

    Here is what happens when it goes wrong.

    http://youtu.be/K2rnY4ikjlc
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    Re: Anyone ever built one of these?

    Post by mac on Fri Sep 14, 2012 9:57 am

    That's a very disturbing video, Todd. What on Earth is it from?

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    Re: Anyone ever built one of these?

    Post by Lien93 on Mon Sep 17, 2012 9:26 am

    Well... i built this thing and it shoots incredibly good, but it got quite a bit longer than expected because i wanted a longer powerstroke and a lighter trigger pull, only need to finish it up and fit a rear sight and stock to it. pictures will follow
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    Re: Anyone ever built one of these?

    Post by mac on Mon Sep 17, 2012 10:12 am

    Lien,

    I look forward to seeing the pics!

    Mac
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    Re: Anyone ever built one of these?

    Post by actionbow on Thu Sep 20, 2012 8:34 pm

    DYING to see this thing!

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    Re: Anyone ever built one of these?

    Post by Lien93 on Fri Sep 21, 2012 3:34 am

    Im maybe getting pictures of it this weekend,
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    Re: Anyone ever built one of these?

    Post by ferdinand on Fri Sep 21, 2012 12:12 pm

    Cant wait to see it! Be carefull shooting it!
    Dont want u to loose an eye!

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    Re: Anyone ever built one of these?

    Post by Lien93 on Sun Sep 23, 2012 3:29 pm

    Gah! Finally i got pictures, had to get my sister to photograph and uppload them for me.

    It is stil a bit rough, but i will polish it when i find time for it.



    The stock, decided to go for a bit more rifle look to fit my hands better (crappy blacksmith's fingers)



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    Re: Anyone ever built one of these?

    Post by actionbow on Sun Sep 23, 2012 3:33 pm

    Very cool. Now put on a blast helmet and make a video of shooting that badboy. What's the draw weight on it?

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    Re: Anyone ever built one of these?

    Post by MRobin on Sun Sep 23, 2012 3:36 pm

    Wow, that's amazing. Really looking forward to a video.
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    Re: Anyone ever built one of these?

    Post by actionbow on Sun Sep 23, 2012 3:39 pm

    Was the string on the original spanned with those steel pins? It seems like the extra string mass would cost you some serious fps.

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    Re: Anyone ever built one of these?

    Post by Lien93 on Sun Sep 23, 2012 3:42 pm

    The draw is 200lb+, its extremly fun to sling 16mm lead balls on the neighbours tin roof Twisted Evil

    I used what was available when i made the string, if i make a new string i wil use wood

    I can't promise a video yet.

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