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

Latest topics

» Trouble with my Gafa
by msalazar2310 Yesterday at 6:27 pm

» My latest crossbow
by drawknife Yesterday at 3:13 pm

» Medieval composite bows
by Dark Factor Mon May 21, 2018 12:46 pm

» The Arbalist Guild - Around the World
by stuckinthemud1 Sun May 20, 2018 5:32 am

» Presentation
by juanjo Sun May 20, 2018 2:13 am

» angles and rivets
by Geezer Fri May 18, 2018 1:16 pm

» morticed nut blocks
by Dark Factor Wed May 16, 2018 12:02 pm

» Crossbow triggers
by Croftage Mon May 14, 2018 1:41 pm

» horn inlay and veneer
by OrienM Sat May 12, 2018 8:59 am

» yew and sinew prod help needed
by OrienM Sat May 12, 2018 8:29 am

» Cocking lever
by c sitas Fri May 11, 2018 8:09 am

» Late roman crossbow
by Dark Factor Wed May 09, 2018 10:27 am

» For Sale: Masai Crossbow
by TonyU Tue May 08, 2018 6:35 am

» Powermaster Madness
by Archer46176 Sun May 06, 2018 8:08 pm

» Fast loading crossbow
by septua Mon Apr 23, 2018 9:22 am

» lashing a glass prod in raw hide?
by kenh Sun Apr 22, 2018 7:00 am

» Balestra Veloce / Leonardo DaVinci
by msalazar2310 Fri Apr 20, 2018 10:37 am

» Goats Foot Lever
by Geezer Wed Apr 18, 2018 12:42 pm

» Hickory and Ipe 180lb flatbow
by actionbow Mon Apr 16, 2018 1:56 pm

» goat foot questions.
by Geezer Sat Apr 14, 2018 10:26 am

» Prod questions....
by Geezer Mon Apr 09, 2018 10:58 pm

» convert compound cross bow to ball shooter
by kenh Sun Apr 08, 2018 7:34 am

» Skane Lockbow replica (and making of)
by actionbow Wed Apr 04, 2018 11:10 am

» String traps bolt to tiller when loosed
by Geezer Tue Mar 27, 2018 9:36 am

» How close to original would you go
by jamesjohnson Thu Mar 22, 2018 4:36 am


    Metal roller nut dimension?

    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 : 55
    Location : Dallas,TX

    Metal roller nut dimension?

    Post by jds6 on Tue May 08, 2012 8:14 am

    Grettings all.
    I am thinking about using a metal roller nut on a future build, but can not find anything on dimensions. I may have over looked it . Does the nut need to be smaller due to it's weight? Anyone out there know where or whom I can purchase one? I don't think I have the resources to make one. Please guide me in the right direction.
    Thanks in advance

    jds6
    avatar
    Geezer
    Master Crossbowyer
    Master Crossbowyer

    Posts : 1010
    Join date : 2010-01-12
    Age : 70
    Location : Austin, Texas, USA

    Re: Metal roller nut dimension?

    Post by Geezer on Tue May 08, 2012 9:52 am

    Yes, a full-sized nut in steel or bronze will have lots of inertia, which contributes to misfire and loss of efficiency. Try reducing width by about a quarter. Of course if the nut gets smaller (either width or diameter) the fit to the nut-socket becomes more critical. Otherwise it can oscillate heavily in the socket. Mounting the nut on an axle will reduce oscillation to almost nothing, but then you've got an axle that will eventually wallow itself loose in its mountings, or bend in the middle, binding up the nut. Yeah, there are no easy answers. Anyhow, a smaller nut oughta help.
    My first crossbow had a huge brass nut, made to Payne-Gallwey's specs. Jeez, that thing was heavy and slow for an 80 lb. Wham-O prod. Eventually, I drilled a bunch of lightening-holes in the nut, increased the hollow in the backs of the lugs and tightened up the socket a bit. That first bow still misfires occasionally if used with a bolt-clip. Without the clip it shoots fine.

    As noted before, aluminum will make a strong, fast, lightweight nut (fitted with a harder sear of course) but aluminum has its own set of problems. I can't recommend it.
    You can make your own nut out of brass round-bar with hand-tools, though it will take a while. Steel is stronger and lighter, but you'll probably need access to a milling-machine.
    So yeah, in short, make the nut narrower... maybe a bit smaller in diameter.
    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 : 55
    Location : Dallas,TX

    Re: Metal roller nut dimension?

    Post by jds6 on Tue May 08, 2012 1:34 pm

    Thanks Geezer for the info. I will give it a go, and see what happens.

    jds6

    Sponsored content

    Re: Metal roller nut dimension?

    Post by Sponsored content


      Current date/time is Wed May 23, 2018 5:16 am