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

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» Fascinating reconstruction
by drawknife Sat Oct 24, 2020 3:54 am

» Collotiere a Charavines crossbow
by stuckinthemud1 Wed Oct 21, 2020 3:17 pm

» Cutting delrin straight by hand?
by drawknife Sun Sep 20, 2020 8:09 am

» Anyone make their own bolts?
by sydney1942 Wed Sep 02, 2020 3:03 pm

» Cocking via moving the bow.
by ora8i Fri Aug 28, 2020 2:03 pm

» Claw crossbow prototype
by Phil Abrahams Fri Aug 28, 2020 9:20 am

» Stirrups, how heavy? Design help needed
by stuckinthemud1 Tue Aug 18, 2020 2:24 pm

» ash lath and pin-lock crossbow
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» Finish on lashings
by stuckinthemud1 Wed Aug 05, 2020 1:48 pm

» Look what the smith sent
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» Covid 19 and crossbow builders
by kenh Thu Jul 30, 2020 10:22 am

» Crossbow accuracy
by Geezer Thu Jul 30, 2020 7:51 am

» How do you feel about miniature crossbows?
by El Zurdo Wed Jul 29, 2020 7:21 am

» how to Build a non Chinese repeating crossbow?
by Dennis Greenaway Tue Jul 28, 2020 4:05 pm

» Just finished my windlass crossbow!
by Dennis Greenaway Tue Jul 28, 2020 4:01 pm

» Sinew backed crossbow prod tillering. Update and questions.
by stuckinthemud1 Tue Jul 28, 2020 2:43 am

» snakeskin not birch bark on composite bows in medieval period
by Cornerstone Mon Jul 27, 2020 3:50 pm

» two axle mechanism makers/accurate plans?
by stuckinthemud1 Wed Jul 22, 2020 10:34 am

» Stonebow Buildalong
by banuvatt Thu Jun 25, 2020 9:00 pm

» How to Attach a PVC Prod to a Stock?
by banuvatt Tue Jun 02, 2020 8:22 am

» finally started my first composite bow
by stuckinthemud1 Fri May 29, 2020 12:40 am

» AMAZING MINI CROSSBOW code name KillCovid-19
by El Zurdo Thu May 21, 2020 3:14 am

» Draw length ash lath
by banuvatt Thu Apr 23, 2020 9:47 am

» Would like to buy or rent a Han Chinese Trigger
by PierreC Thu Apr 23, 2020 2:37 am

» High Draw Weight PVC Crossbow Build
by banuvatt Fri Apr 17, 2020 3:07 pm


    Compressed Air Powered Crossbow

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    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

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    Join date : 2015-02-23

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    Post by benjaminh123 on Wed Feb 25, 2015 6:47 pm

    Hello Everyone,
    I have been wanting to make a compact crossbow for a while; I think I have finally settled on Robert van House's design (I do plan to try other designs as well):
    http://www.freepatentsonline.com/4169456.pdf


    A couple questions:

    1. Is there any advantage of having a larger diameter pipe/compression chamber? I plan to make this powered off compressed air; I would have a Schrader type valve on the compression chamber; I would pump it up to about 100psi or there abouts, and the movement of the arms and piston will bring up the pressure some more.
    2. What would you recommend as a material for the swinging arms? It needs to be relatively easy to machine, lightweight, but strong.
    avatar
    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

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    Post by benjaminh123 on Wed Feb 25, 2015 8:25 pm

    Another question:

    Would a Rubber laboratory type stopper suffice as the rubber plunger part? It would be turned to shape and a bolt would go through it with a washer to reinforce it on both ends

    Or would a hardwood plunger be better with several o rings fitted?


    Last edited by benjaminh123 on Thu Feb 26, 2015 8:27 am; edited 1 time in total
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    chaz
    Crossbow Junkie

    I live here!


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    Post by chaz on Thu Feb 26, 2015 8:18 am

    Why not just get yourself a break barrel pellet rifle ............ plenty out there .......gamo .benjamin.crosman etc.............and make yourself some little darts and shoot through it
    Key here is "crossbow"

    Chaz
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    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

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    Join date : 2015-02-23

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    Post by benjaminh123 on Fri Feb 27, 2015 1:21 pm

    I realize that many people would not consider this a crossbow; I don't know if I even do. The main reason for making a bow like this is the adjustable draw weight. With this type of "crossbow", the draw weight can be nearly infinitely variable.
    mac
    mac
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    Post by mac on Fri Feb 27, 2015 2:27 pm

    benjaminh123

    I mostly do not pay much attention to things that are not medieval, but I did look at the drawing.  If you do try to built this thing, you will need to support the cylinder much more strongly than the way it is shown.  As it is, it will surely burst out of the stock while it is being spanned.  There is simply not enough wood there to support it.  

    Mac
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    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

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    Join date : 2015-02-23

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    Post by benjaminh123 on Fri Feb 27, 2015 2:39 pm

    Thanks for the warning; I will take that to mind and reinforce it heavily, either with wood or with metal. I am still in the planning stage (drawing things out, etc.) and would really appreciate any advice/concerns.
    Anatine Duo
    Anatine Duo
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    If there is a will, there is a way.


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    Post by Anatine Duo on Sat Feb 28, 2015 12:56 pm

    I hope this works out for you... looks fun

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