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

Latest topics

» Chinese crossbow with auxiliary string?
by c sitas Today at 8:57 pm

» Crusader crossbow
by c sitas Yesterday at 9:41 pm

» Yet another one
by Daniel Levesque Yesterday at 11:51 am

» Whamo showed up, prod replacement ideas
by kenh Mon Jun 19, 2017 4:25 pm

» Renaissance Sporting crossbow
by tony a Mon Jun 19, 2017 2:10 am

» 15th century saxon prods
by Geezer Sun Jun 18, 2017 10:46 pm

» loose laminate issues
by c sitas Sun Jun 18, 2017 8:42 am

» Of Bows and Torsion Engines
by c sitas Fri Jun 16, 2017 2:55 pm

» My second crossbow
by Daniel Levesque Fri Jun 16, 2017 10:48 am

» Need to locate Windlass Crossbow, pre 1600, in Rome, Venice, or Florence
by 8fingers Tue Jun 13, 2017 11:24 pm

» Crossbow Projectiles
by Geezer Tue Jun 13, 2017 8:10 pm

» Greetings!
by OnlyHuman Mon Jun 12, 2017 7:40 am

» Anyone know what this is?
by Yuki23emma Sun Jun 11, 2017 2:54 pm

» Prod specs
by Onager Lovac Mon Jun 05, 2017 4:25 pm

» Finished Crossbow
by kenh Sat Jun 03, 2017 8:34 pm

» The Arbalist Guild - Around the World
by Turnigy Fri Jun 02, 2017 1:25 pm

» Reverse draw "compound" build
by Turnigy Fri Jun 02, 2017 1:20 pm

» Casting Resource
by White Oak Wed May 31, 2017 2:28 am

» The Road so far......
by White Oak Mon May 29, 2017 7:17 am

» GLOSSARY OF TERMS
by Onager Lovac Wed May 24, 2017 6:41 pm

» Hello from Maine
by White Oak Sun May 21, 2017 11:06 pm

» Leonardo Da Vinci string with suport-rolls
by Oppenheimer Tue May 16, 2017 11:40 am

» Compact repeating compound project
by Phil Abrahams Mon May 08, 2017 2:10 pm

» Trying to reduce the power stroke in my next project
by octavioaugusto.oliveira Thu Apr 27, 2017 1:27 pm

» Its good to be back!!
by Juan galeano Tue Apr 25, 2017 9:31 am


    Failed bow string

    Share
    avatar
    jds6
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 197
    Join date : 2011-10-18
    Age : 54
    Location : Dallas,TX

    Failed bow string

    Post by jds6 on Sun Sep 02, 2012 1:34 pm

    Greetings all;

    Just had a string fail (break) at the loop end while attached to the nock on the prod. Startled the mess of me, since this was the first time to experience such a thing.
    I have read on the forum that I can file down the nock to make it more rounded and smooth,and maybe add some leather around the nock to protect the string against the metal prod. Giving this a try.

    Leaving the bow string on the crossbow while not in use for periods at a time cause this to happen? Should I remove the strings from the prods ( 2 bows ) while not in use? Thanks in advance for any input.

    jds6

    P.S. One should always examine the bow for wear before shooting!!!!
    avatar
    kenh
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 709
    Join date : 2012-08-03
    Age : 69
    Location : Living Aboard a Sailboat in Fort Myers, FL

    Re: Failed bow string

    Post by kenh on Sun Sep 02, 2012 1:45 pm

    First question -- what kind of crossbow? Medieval replica? Modern Chinese bow from Ebay and such? Commercially made or home made?

    Second question - what kind of prod? Homemade carspring? Commercial steel from a crossbow company like Alchem? Chinese fiberglass or metal?

    How long have you owned/been shooting this bow?

    Draw weight?

    Strings will break. Perhaps you got sand in the fibers of the string when spanning/un-spanning the bow some time ago.

    My personal opinion is that spanning/un-spanning a prod will do more to weaken a string then just leaving the prod spanned, but that's just my opinion, others will chime in I'm sure.

    No reason you can't smooth the nock grooves, but "filing" might be a bit strong of a word. More like "light sanding", or "polishing". Thin leather can also be superglued around areas of potential wear.
    avatar
    jds6
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 197
    Join date : 2011-10-18
    Age : 54
    Location : Dallas,TX

    Re: Failed bow string

    Post by jds6 on Sun Sep 02, 2012 9:28 pm

    kehn, to answer your questions, I have a homemade medieval replica with a commercially made 150# steel prod. I finished this project around Feb. of this year. Probably in the range of 150 shots from this bow.
    Yes you are right about filing, perhaps sanding and polishing is the better term. Thanks for your insight on the spanning/un-spanning of the prod. Sounds good but like you said some one else might buzz in on the topic.

    jds6

    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 928
    Join date : 2010-01-12
    Age : 69
    Location : Austin, Texas, USA

    Re: Failed bow string

    Post by Geezer on Mon Sep 03, 2012 6:52 am

    Failed bowstrings: In my experience, they're MUCH more likely with misfires. Over-long strings with too little brace-height also contribute. Pay attention to loose strands. Once a single strand fails, the rest isn't far behind.
    And yes, In concur that removing strings between trips to the range are likely to do more damage than leaving the string in place... at least with metal bows. I've had good success with fiberglass prods as well... at leas with the chunky Barnett-type. Thinner laminates and laminated wood may warp or twist if left strung in the summer, or if stored in some hot place. Geezer.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 928
    Join date : 2010-01-12
    Age : 69
    Location : Austin, Texas, USA

    Re: Failed bow string

    Post by Geezer on Mon Sep 03, 2012 6:53 am

    Huh, maybe I oughta do a spelling and grammar check next time... still I think the above basically made sense. Geezer.
    avatar
    jds6
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 197
    Join date : 2011-10-18
    Age : 54
    Location : Dallas,TX

    Re: Failed bow string

    Post by jds6 on Mon Sep 03, 2012 8:13 am

    Thanks Geezer, if I do remember right the brace-height was a little to small. In that note I twisted the string enough to get the proper brace. Might have caused some damage but not to sure.I did have a few misfires with this bow (rookie mistakes). Thanks for the advice, I will be more observant of the condition of the bowstring from now on. Thanks again!!!


    jds6
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 928
    Join date : 2010-01-12
    Age : 69
    Location : Austin, Texas, USA

    Re: Failed bow string

    Post by Geezer on Mon Sep 03, 2012 8:18 am

    Yeah, misfires do a disproportionate amount of damage to bowstrings. If you have a complete misfire, (in which essentially no energy gets invested in the bolt) you load the ends of the string to something like four or five- times the draw-weight. So a 100 lb. bow suddenly hits the string-loops with a 400-500 lb. shock-load. A few of those can break one or more strings inside, but leave the shooter none-the wiser. Then eventually another string goes, and another, then rippp! the whole thing goes in a heartbeat. So if you see one strand getting loose beware! Geezer.

    Sponsored content

    Re: Failed bow string

    Post by Sponsored content


      Current date/time is Fri Jun 23, 2017 9:40 pm