The Arbalist Guild

Would you like to react to this message? Create an account in a few clicks or log in to continue.

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

Latest topics

» Ball shooting Crossbows worth the bother
by c sitas Sat Sep 25, 2021 7:34 pm

» Chu Ko Nu - repeating chinese crossbow
by c sitas Fri Sep 24, 2021 8:30 am

» Skew of tiller
by drawknife Fri Aug 27, 2021 9:18 am

» tiller desgin
by crusader Wed Aug 18, 2021 10:37 am

» Want to build modern target crossbow
by ora8i Fri Aug 13, 2021 1:20 pm

» starting a 1400's replica
by tghsmith Wed Aug 11, 2021 10:25 am

» New Medieval just about finished
by Dark Factor Mon Aug 02, 2021 6:41 am

» How do I tune this
by stuckinthemud1 Sun Jul 25, 2021 3:14 am

» Plans and materials for my first build
by c sitas Sat Jul 03, 2021 7:39 am

» Bolt rest
by stuckinthemud1 Mon Jun 14, 2021 3:24 pm

» Collotiere a Charavines crossbow
by stuckinthemud1 Sun Jun 06, 2021 2:25 pm

» ash lath and pin-lock crossbow
by stuckinthemud1 Wed Jun 02, 2021 7:56 am

» Late medieval tournament distances?
by stuckinthemud1 Thu Apr 15, 2021 8:20 am

» Cutting delrin straight by hand?
by kenh Thu Apr 01, 2021 8:24 pm

» Other forums like this one?
by stuckinthemud1 Tue Mar 30, 2021 9:23 am

» new find in china, terra cotta warrior site
by tghsmith Thu Mar 25, 2021 4:42 am

» Crossbow Books
by Andy. Sun Mar 14, 2021 3:46 pm

» 95lb ancient crossbow shot faster than 960lb medieval
by Fangbows Fri Mar 12, 2021 11:36 pm

» best type of horn to use..
by kenh Tue Mar 09, 2021 3:16 pm

» re-introduction
by tghsmith Sun Mar 07, 2021 3:15 pm

» 4 fletch question
by 8fingers Fri Feb 05, 2021 3:14 am

» fix bolts
by MPDVM Tue Feb 02, 2021 7:40 pm

» Reverse draw compound bow build
by c sitas Tue Feb 02, 2021 7:20 pm

» New Build for 2020
by Gnome Wed Jan 27, 2021 6:19 am

» Spanning bench ideas
by stuckinthemud1 Fri Jan 08, 2021 1:07 pm


5 posters

    Yew Composite prod:help needed

    avatar
    Edward donald
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 36
    Join date : 2018-12-12

    Yew Composite prod:help needed - Page 5 Empty Yew Composite prod:help needed

    Post by Edward donald Fri Jul 26, 2019 12:03 pm

    First topic message reminder :

    Hi there

    I am new to posting in this forum but have used it in previous builds. I am looking to build crossbow prod useing  Yew and sinew only. Horn seems too time consuming. 

    I would like to follow a build I have seen by the user OrienM:

    https://thearbalistguild.forumotion.com/t1655-yew-and-sinew-prod-help-needed

    However i would like the draw weight to be at least 250lbs. I know this is a lot to ask without useing horn but is anyone able to give me a guess as to the dimensions for what that might be before tillering.

    On a side note the design of the crossbow is very unique as it allows the crossbow to cocked in under 3 seconds with a draw weight of 400lbs and utilises this speed of draw with a magazine of bolts. The materials used were available to anyone living in the period of when crossbows were still used on the battlefield and so from a historic sense this build is very interesting. The design is relatively compact and very easy to use with minimal effort in the loading process. 

    I'd very much appretiate any advice/help, and would be happy to reveal the design in a PM

    Regards

    Ed
    Geezer
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1194
    Join date : 2010-01-12
    Age : 73
    Location : Austin, Texas, USA

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by Geezer Wed Aug 07, 2019 12:19 pm

    There are any number of possible devices that can work, as long as they bend the prod evenly, and don't do any surface damage.  I have no doubt you can think of better solutions than mine.  In the middle ages, they had a table with pegs to hold the crossbow steady and a huge built-in screw to draw the prod back via clamps. I've seen it called a Ziebank (pulling bench)
     Geezer.
    avatar
    banuvatt
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 271
    Join date : 2018-09-12

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by banuvatt Wed Aug 07, 2019 1:29 pm

    I've tried putting two blocks on a table then in between two the blocks put a clamp. You can try putting a towel or a piece of leather over the blocks if you're worried about damaging the prod. Put the prod on the two blocks and put the clamp on the middle of the prod. Tighten the clamp until you can slide the bow string over the nocks.
    avatar
    Edward donald
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 36
    Join date : 2018-12-12

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by Edward donald Wed Aug 07, 2019 4:42 pm

    that sounds simple. yeah i'll try that. i'll cover the prod with leather or something
    avatar
    Edward donald
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 36
    Join date : 2018-12-12

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by Edward donald Fri Aug 16, 2019 4:50 am

    Hi there

    I have been away for a week. the first layer of sinew has had 14 days drying. it is now rock hard. Is it too hard to add the second layer of sinew?

    ed
    avatar
    stuckinthemud1
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 398
    Join date : 2014-02-05
    Age : 53
    Location : south wales valleys

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by stuckinthemud1 Fri Aug 16, 2019 6:33 am

    As I understand it, the new glue wets the first layer anyway, so, you can put the second layer on fairly soon after the first, make sure you wrap the bow good and tight to stop the second layer soaking off the first one. I use bike inner tube strips over thin fabric
    OrienM
    OrienM
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 195
    Join date : 2014-08-01
    Age : 45
    Location : New Mexico, USA

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by OrienM Fri Aug 16, 2019 6:39 am

    Make sure the sinew is very clean (wipe with acetone), size the back with thinned glue again, and let it dry before adding the next layer. Should be fine, lots of makers seem to do layer-by-layer application of sinew. I prefer one thick layer, but I live in a very dry climate, too.
    avatar
    stuckinthemud1
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 398
    Join date : 2014-02-05
    Age : 53
    Location : south wales valleys

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by stuckinthemud1 Fri Aug 16, 2019 7:02 am

    Nah, I live in a really wet climate, rains 1 day in 3, average humidity is never below 70% and I tend to apply sinew in 1 thick layer, partly because I am lazy, partly because the new layer re-activates the glue in the previous layer(s), so there's no real difference as far as the end result is concerned. Do your glue-up then go spend a few months building the stock, bolts, spanning bench, laying up the next lath....
    OrienM
    OrienM
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 195
    Join date : 2014-08-01
    Age : 45
    Location : New Mexico, USA

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by OrienM Fri Aug 16, 2019 4:46 pm

    My "technical" reason for applying it all at once is to keep the layers from stressing each other as the backing dries, I figure shrinkage over a dry layer reduces the tension in that layer to some extent, and I want high tension. I also once had a backing done layer-by-layer de-laminate, due to hand oils on an inner surface.

    The primary reason I do it is just that it's quicker that way Smile
    avatar
    stuckinthemud1
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 398
    Join date : 2014-02-05
    Age : 53
    Location : south wales valleys

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by stuckinthemud1 Sat Aug 17, 2019 5:40 am

    So, do you bend reflex into your prods as they cure?
    OrienM
    OrienM
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 195
    Join date : 2014-08-01
    Age : 45
    Location : New Mexico, USA

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by OrienM Sat Aug 17, 2019 7:53 am

    stuckinthemud1 wrote:So, do you bend reflex into your prods as they cure?
     
    No, the wooden cores are too stiff for the sinew to pull into reflex. I just want to get the most 'snap' out of the backing, and keep the fibers taut since the limbs aren't moving very far. I also want to keep the prod deflexed so I can string it later! Archery bows, being longer and more flexible, will usually reflex themselves by quite a bit.
    avatar
    stuckinthemud1
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 398
    Join date : 2014-02-05
    Age : 53
    Location : south wales valleys

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by stuckinthemud1 Sat Aug 17, 2019 12:10 pm

    That's ok then, I couldn't reflex mine either, I was worried I might have missed a trick!

    Sponsored content

    Yew Composite prod:help needed - Page 5 Empty Re: Yew Composite prod:help needed

    Post by Sponsored content


      Current date/time is Tue Sep 28, 2021 1:11 am