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    Heavy German sporting crossbow build

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    Lien93
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    Heavy German sporting crossbow build

    Post by Lien93 on Thu Aug 23, 2012 2:26 pm

    Thought I'd share this on the forum

    This is a project I'm working on and its going to be covered in ebony and bone when finished.

    Internal components still have to be made

    Prod and cranequin is made by me.





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    Todd the archer
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    Re: Heavy German sporting crossbow build

    Post by Todd the archer on Thu Aug 23, 2012 3:35 pm

    Looks good, any idea how strong the prod is? Any details you could share with us on the bow string?



    Keep us posted,



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    Re: Heavy German sporting crossbow build

    Post by chaz on Thu Aug 23, 2012 7:32 pm

    Lien93,

    What a piece of work ! It would be nice to see the details of the cranequin, so far so great!

    Chaz

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    Re: Heavy German sporting crossbow build

    Post by Guest on Fri Aug 24, 2012 9:34 am

    gone


    Last edited by Gui on Sun Sep 02, 2012 1:27 pm; edited 1 time in total

    Lien93
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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Sat Aug 25, 2012 12:00 pm

    The prod is at about 600 to 1000 lb ( don't have a scale that takes that much). Prod was made from a leaf spring with forged ends. String is artificial sinew and is 13 mm thick with reinforced loops and knotted linen servings.

    Will try to take some pictures of the cranequin later.

    Lien93
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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Mon Aug 27, 2012 11:22 am

    More pictures of the cranequin, decided to change the top cover into a more ornate one. still some fine tweaking on the gears left, but it works alright.







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    Re: Heavy German sporting crossbow build

    Post by mac on Mon Aug 27, 2012 12:24 pm

    Lein,

    Did you make the crank pinion by welding the "leaves" to the shaft?

    Mac

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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Mon Aug 27, 2012 12:35 pm

    mac wrote:Lein,

    Did you make the crank pinion by welding the "leaves" to the shaft?

    Mac

    Yes I did, but It's barely visible because of all the grease

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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Thu Aug 30, 2012 11:22 am

    Ran into a problem while fitting the trigger system. It turns out the cranequin is in the way of the hole for resetting the trigger, any sugestions?

    Just ordered the ebony veneers and the bone for this one too, cant wait to finish it.

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    Re: Heavy German sporting crossbow build

    Post by chaz on Thu Aug 30, 2012 8:32 pm

    Lien,

    Did you make the main gear sprocket or did you make use of an existing one.............. if one is available I say use it. By the way, is it customary to remove the cranquin before firing? ( probably comes under the heading of stupid queations) But I don't know.

    Chaz

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    Re: Heavy German sporting crossbow build

    Post by Rizzar on Thu Aug 30, 2012 10:25 pm

    Normally the cranequin is just for spanning purpose on the crossbow and shouldnt be in the way for resetting the trigger.

    I guess you probably want to reset the trigger when the cranequin lifts the string into the roller nut and not before putting the cranequin on?

    If you can´t reset it before spanning it would probably be a mechanism design problem. you should be able to prepare everything before spanning.


    But i can imagine where the problem with that is. perhaps you cant lift the string over the secured nut.
    What kind of trigger mechanism are you going to use? lever or trigger? How many axles?
    Pictures would be nice.

    Very nice work, especially the cranequin.
    Your string looks like a gothic knot, is it one?


    greetings Rizzar

    Lien93
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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Fri Aug 31, 2012 3:31 am

    Its a 2 axle trigger, its perhaps possible to push under the nut or from one of the sides

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    Re: Heavy German sporting crossbow build

    Post by Guest on Fri Aug 31, 2012 7:05 am

    gone


    Last edited by Gui on Sun Sep 02, 2012 1:27 pm; edited 1 time in total

    Lien93
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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Fri Aug 31, 2012 9:34 am

    Gui wrote:Thank you for sharing details of your cranequin Lien93. You have given me some great ideas there for producing one myself;

    I feel confident in making the ratchet bar, the bit that has always concerned me was making the cogs/sprockets - i'm going to have a look at using an old bike sprocket and copy your welded crank pinion. Just need to brush up those welding skills... currently spend more time dressing the welds with a grinder than actually welding!!
    Cheers
    Gui

    For the gears you only need a angle grinder and a drill press. Proper measuring instruments is a must

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    Re: Heavy German sporting crossbow build

    Post by fiddler49 on Sun Sep 02, 2012 8:07 pm

    Very nice bow, but why would you put a nylon string on it? Fake sinew is really stretchy stuff!!!

    Lien93
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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Mon Sep 03, 2012 10:18 am

    I used the fake sinew because it was the only thing available at the time, it don't stretch that bad actually.

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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Mon Sep 03, 2012 11:41 am

    Considering to uppgrade the trigger from two to five axles to reduce the trigger weight and it will also let me reset the mechanism easier. (it also looks a lot cooler)

    Any input?

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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Mon Jan 21, 2013 1:19 pm

    A bit of progress on the build. The tiller is now completely covered in ebony, and most of the bone plates is in place, i still have to install the internal parts and a bit more metalwork.





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    Re: Heavy German sporting crossbow build

    Post by ferdinand on Mon Jan 21, 2013 3:29 pm

    That is one verry verry beautifull crossbow! Did u make the cranequin from a design? And would u be willing to share it with me? I love it!

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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Mon Jan 21, 2013 3:38 pm

    The cranequin was designed as i built it, but it was not that hard to make. i can try to make some plans for it if you want to.

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    Re: Heavy German sporting crossbow build

    Post by chaz on Tue Jan 22, 2013 5:06 am

    Lien03

    How much does the cranequin weigh ? Would please share your plan idea with the forum ? Your project shows very well that you have acquired a good many skills and put them to very good use ! The design on the bone work is really nice and likewise with all the other details such as lining the whole for the prod lashing with bone ......... over the TOP !

    Chaz
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    Re: Heavy German sporting crossbow build

    Post by ferdinand on Wed Jan 23, 2013 3:48 pm

    Lien93 wrote:The cranequin was designed as i built it, but it was not that hard to make. i can try to make some plans for it if you want to.
    If u want to that would be great!
    I could probably make one like u did but plans make it so much more easy!
    If anyone else has plans? That would save u the trouble!
    Thanks Lien!

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    Re: Heavy German sporting crossbow build

    Post by chaz on Thu Jan 24, 2013 6:08 am

    Ferdi,

    The Payne- Gallwey book from pages 131 to 144 has some pretty good info and diagrams but no measurements on the cranequin devices , hopefully might be helpful.

    Chaz

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    Re: Heavy German sporting crossbow build

    Post by Lien93 on Thu Jan 24, 2013 10:24 am

    I hope this helps

    Request other wievs if necassary
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    Re: Heavy German sporting crossbow build

    Post by Archeress on Sat Jan 26, 2013 9:20 pm

    Fabulous crossbow! Is everybody on this forum some kind of genius artisan?

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