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

Latest topics

» My project Powermaster
by EugeneSlagle Mon Oct 30, 2017 1:54 pm

» Lillohus crossbow
by Dark Factor Mon Oct 30, 2017 12:45 pm

» Old Powermaster project & question.
by EugeneSlagle Mon Oct 30, 2017 8:14 am

» My 2nd crossbow project - german crossbow with cranequin
by MePilot1 Sat Oct 21, 2017 9:36 am

» Medieval composite bows
by Dark Factor Sat Oct 21, 2017 1:44 am

» Medieval bowyer
by Dark Factor Wed Oct 18, 2017 12:30 pm

» New crossbow builder
by wjbates1430 Tue Oct 17, 2017 2:10 pm

» Airsoft Crossbow-Finished at Last!
by JacobL Thu Oct 12, 2017 7:27 pm

» Powermaster Madness
by c sitas Wed Sep 27, 2017 8:41 am

» Powermaster
by c sitas Wed Sep 20, 2017 9:58 am

» Best wood for a novice?
by Geezer Sun Sep 17, 2017 9:21 am

» Adding a steel sear insert?
by Geezer Fri Sep 15, 2017 7:13 am

» Great Machines
by c sitas Sat Sep 09, 2017 5:39 pm

» Medieval Crossbow Bolts DIY Question
by Rumburak Thu Sep 07, 2017 12:17 pm

» Berkhamsted Castle and Glasgow Museum wooden prod crossbow
by Juniper Fri Aug 25, 2017 3:54 pm

» Beware of Alchem
by Archer46176 Mon Aug 21, 2017 3:33 pm

» How to measure and cut leather for prod
by Celtic Archer Sun Aug 20, 2017 5:56 pm

» Crossbow with built in lever?
by John Edgerton Thu Aug 17, 2017 12:38 pm

» Of Bows and Torsion Engines
by JacobL Mon Aug 14, 2017 12:03 pm

» Early Lever and pin Crossbow
by topfmine Mon Aug 14, 2017 8:56 am

» Crusader crossbow
by topfmine Mon Aug 14, 2017 8:53 am

» First Efforts
by rickraedeke Tue Aug 08, 2017 5:25 am

» aluminum prod
by Phil Abrahams Fri Aug 04, 2017 8:38 am

» First whitetail buck taken with medieval crossbow
by Phil Abrahams Fri Aug 04, 2017 3:38 am

» Airsoft Crossbow
by JacobL Wed Aug 02, 2017 9:11 pm


    Fixing a bad delflex

    Share
    avatar
    Daniel Levesque
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 44
    Join date : 2016-12-06
    Location : Quebec, Canada

    Fixing a bad delflex

    Post by Daniel Levesque on Tue Feb 21, 2017 11:20 am

    Hello everyone,

    I just sinewed an hickory prod a couple of weeks ago and foundd out my deflex wasn't so good at the end. It's not quite even and maybe not pronounced enough. Unless I'm mistaken here, I think you can immerse a wooden prod in water to get the sinew back right ?

    I'd really like to remove the sinew, work the deflex again by re-steaming and bending it and re-apply the sinew on.

    Is that even possible or do you have any better suggestions ?
    avatar
    hullutiedemies
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 178
    Join date : 2012-07-03
    Location : Fennoscandia

    Re: Fixing a bad delflex

    Post by hullutiedemies on Thu Feb 23, 2017 2:32 am

    It is supposed to do that.
    Sinew shrinks when it dries, and pulls the bow to reflex.

    The more deflexed limb has stiffer wood or thinner sinew.
    Just test it with long string on tillering stick and scrape the belly from stiffer side until the limbs bends evenly.
    avatar
    OrienM
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 136
    Join date : 2014-08-01
    Age : 41
    Location : New Mexico, USA

    Re: Fixing a bad delflex

    Post by OrienM on Thu Feb 23, 2017 7:58 am

    Did the prod change shape (lose deflex) after sinewing? Sinew does shrink as it dries, and can pull the limbs forward in the process. This happens mostly with lighter-weight, more flexible prods...very heavy cores don't tend to move, in my experience.

    If the shape was off before the sinew was applied, you can remove the sinew and re-bend. The method I've used is to keep the prod under water for about 12 hours, then peel off the softened sinew. I've never done this to a non-broken prod, but it should be possible to re-use the wooden core as well as the sinew...dry it out slowly and carefully afterwards, so it won't crack.
    avatar
    Daniel Levesque
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 44
    Join date : 2016-12-06
    Location : Quebec, Canada

    Re: Fixing a bad delflex

    Post by Daniel Levesque on Thu Feb 23, 2017 9:52 am

    Thank you both !

    Actually, I'm not a 100 % sure my prod was bent correctly and evenly from the start so I'll put it in water, bend it again and re-apply the sinew. I'll try to go for a greater deflez too. Thanks again guys ! Very Happy
    avatar
    Daniel Levesque
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 44
    Join date : 2016-12-06
    Location : Quebec, Canada

    Re: Fixing a bad delflex

    Post by Daniel Levesque on Fri Mar 31, 2017 11:40 am

    Hello everyone, I just finished my first build, I'll post some photos soon but so far, I've shot one bolt with it (didn't went through the 30 shots "safety" yet) and, well... let's say I wouldn't like to be in it's path. This Xbow packs quite a punch for sure !!
    avatar
    OrienM
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 136
    Join date : 2014-08-01
    Age : 41
    Location : New Mexico, USA

    Re: Fixing a bad delflex

    Post by OrienM on Sat Apr 01, 2017 7:54 am

    Awesome! Can't wait to see some pics. How did the process of reworking the prod go for you?
    avatar
    Daniel Levesque
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 44
    Join date : 2016-12-06
    Location : Quebec, Canada

    Re: Fixing a bad delflex

    Post by Daniel Levesque on Mon Apr 03, 2017 10:36 am

    Went pretty well in fact, I did what you told me. For the sinew, I had to put it in water 6-8 hours, remove what I could and repeat the process a couple of time to remove all of it. I put the prod in my steambox again, clamped it on the form, let it dry and I re-applied the sinew. It comes out pretty strong but flexible. I would guess between 150 - 200 lbs. I can pull back the string by hand but it's not easy.
    avatar
    kenh
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 738
    Join date : 2012-08-03
    Age : 69
    Location : Living Aboard a Sailboat in Fort Myers, FL

    Re: Fixing a bad delflex

    Post by kenh on Mon Apr 03, 2017 2:57 pm

    Yu should have let that sinew dry, with the prod unstrung, for at least a couple months, before stringing the prod and using it.  That's how folks who replicate wood/horn/sinew horsebows work.   
    avatar
    Daniel Levesque
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 44
    Join date : 2016-12-06
    Location : Quebec, Canada

    Re: Fixing a bad delflex

    Post by Daniel Levesque on Tue Apr 04, 2017 7:33 am

    Mmm... maybe I chose the wrong words sorry (english is not my main language). I did let the sinew dry on the unstrung prod for a whole month. I guess it's still better to unstring the prod after each shooting session right ?
    avatar
    OrienM
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 136
    Join date : 2014-08-01
    Age : 41
    Location : New Mexico, USA

    Re: Fixing a bad delflex

    Post by OrienM on Tue Apr 04, 2017 8:26 am

    Glad to hear the re-work went so well! Very Happy

    While some bowyers do let sinew dry and cure for a year, I tend to leave it for only a month or so. I live in a desert, which probably speeds the drying process up quite a bit.

    Definitely do unstring the prod when not in use. Any wood bow left strung will take a set eventually, and lose power.
    avatar
    Daniel Levesque
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 44
    Join date : 2016-12-06
    Location : Quebec, Canada

    Re: Fixing a bad delflex

    Post by Daniel Levesque on Tue Apr 04, 2017 11:13 am

    Nice ! seems like I'm doing the right thing then ! Very Happy

    Sponsored content

    Re: Fixing a bad delflex

    Post by Sponsored content


      Current date/time is Mon Nov 20, 2017 10:00 am