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


    Barnett commando style stock

    Share

    edstuff
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 74
    Join date : 2014-12-16

    Barnett commando style stock

    Post by edstuff on Wed Jan 14, 2015 11:47 am


    So I was thinking about making a Barnett Commando style stock. As you can see my original intention was a 10 inch power stroke but it turns out it would be 9 inch unless I make the handle longer.  I'm thinking the first one would be made out of wood then if I like it I may try to make another from plastic.  I wanted it to be light and also be able to use a cheap 120 or 150 lb prod like from the man kung crossbows.  Still need to design a trigger system for it too.  It's still in the engineering phase at the moment.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

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

    Re: Barnett commando style stock

    Post by Geezer on Wed Jan 14, 2015 12:39 pm

    The Barnett Commando stocks worked fairly well, with the following caveats.  First, they tend to get a bit loose in the joint, second, you have to make sure the hooks that grab the string are very wide and smooth, otherwise they'll wear out string-serving and then the string very quickly.  Third, you want to design the bow so that the hooks drop below the level of the table (string-groove) before shooting.  Otherwise, your string will eventually hit the hooks and pow, it will be gone.
    The whole thing might work better, if you attached the hooks to cables running over pulleys.  That would give you a smoother draw.  What's more, its likely you can use springs or surgical rubber hose to draw the hooks downward at the end of the cocking-stroke prior to shooting.  Have fun storming the castle.  Geezer.

    edstuff
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 74
    Join date : 2014-12-16

    Re: Barnett commando style stock

    Post by edstuff on Wed Jan 14, 2015 4:38 pm

    I was actually debating putting some kind of rubber around the hooks.  That way they would also act as dampeners.
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

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

    Re: Barnett commando style stock

    Post by Geezer on Wed Jan 14, 2015 5:29 pm

    The original Barnett Commando covered the hooks with some thick, clear plastic that wore out distressingly fast.  As far as using the hooks for shock-absorbers at end of the stroke.... you really don't want to do that. The fact is, as the bolt leaves your bow, the string recoils a good inch ahead of the normal stopping point and then rebounds to the resting point.  It still has a fair amount of energy there... how much depends on your bolt weight and lots of other stuff.  But in short, you DON"T want your string to strike anything at the end of the run. Try and design the spanning hooks so they follow some sort of guide downward, so they're clear of the track when the bow is ready to shoot.  This will make you much happier.  Geezer.

    edstuff
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 74
    Join date : 2014-12-16

    Re: Barnett commando style stock

    Post by edstuff on Wed Jan 14, 2015 7:04 pm

    Yeah I was just looking at pics of commandos.  I see what you mean.

    Sponsored content

    Re: Barnett commando style stock

    Post by Sponsored content


      Current date/time is Fri Jun 23, 2017 9:37 pm