The Arbalist Guild

Would you like to react to this message? Create an account in a few clicks or log in to continue.

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

Latest topics

» Collotiere a Charavines crossbow
by stuckinthemud1 Sun Jun 06, 2021 2:25 pm

» Plans and materials for my first build
by chilihook Thu Jun 03, 2021 10:42 am

» ash lath and pin-lock crossbow
by stuckinthemud1 Wed Jun 02, 2021 7:56 am

» starting a 1400's replica
by tghsmith Tue May 11, 2021 12:58 pm

» Late medieval tournament distances?
by stuckinthemud1 Thu Apr 15, 2021 8:20 am

» Cutting delrin straight by hand?
by kenh Thu Apr 01, 2021 8:24 pm

» Other forums like this one?
by stuckinthemud1 Tue Mar 30, 2021 9:23 am

» new find in china, terra cotta warrior site
by tghsmith Thu Mar 25, 2021 4:42 am

» Crossbow Books
by Andy. Sun Mar 14, 2021 3:46 pm

» 95lb ancient crossbow shot faster than 960lb medieval
by Fangbows Fri Mar 12, 2021 11:36 pm

» best type of horn to use..
by kenh Tue Mar 09, 2021 3:16 pm

» re-introduction
by tghsmith Sun Mar 07, 2021 3:15 pm

» 4 fletch question
by 8fingers Fri Feb 05, 2021 3:14 am

» fix bolts
by MPDVM Tue Feb 02, 2021 7:40 pm

» Reverse draw compound bow build
by c sitas Tue Feb 02, 2021 7:20 pm

» New Build for 2020
by Gnome Wed Jan 27, 2021 6:19 am

» Spanning bench ideas
by stuckinthemud1 Fri Jan 08, 2021 1:07 pm

» Is Digitarc still in business?
by Dennis Greenaway Tue Dec 29, 2020 12:03 pm

» Covid 19 and crossbow builders
by banuvatt Thu Dec 24, 2020 6:04 am

» Finish on lashings
by stuckinthemud1 Tue Dec 15, 2020 2:15 am

» how to Build a non Chinese repeating crossbow?
by c sitas Tue Nov 17, 2020 1:05 pm

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


    Compressed Air Powered Crossbow

    avatar
    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Compressed Air Powered Crossbow Empty Compressed Air Powered Crossbow

    Post by benjaminh123 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!!!

    Posts : 54
    Join date : 2015-02-23

    Compressed Air Powered Crossbow Empty Re: Compressed Air Powered Crossbow

    Post by benjaminh123 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
    avatar
    chaz
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!

    Posts : 313
    Join date : 2012-04-13
    Age : 72
    Location : Texas

    Compressed Air Powered Crossbow Empty Re: Compressed Air Powered Crossbow

    Post by chaz 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
    avatar
    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Compressed Air Powered Crossbow Empty Re: Compressed Air Powered Crossbow

    Post by benjaminh123 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
    Master Weaponsmith
    Master Weaponsmith

    Posts : 560
    Join date : 2010-12-23
    Location : Near Philly USA

    Compressed Air Powered Crossbow Empty Re: Compressed Air Powered Crossbow

    Post by mac 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
    avatar
    benjaminh123
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!

    Posts : 54
    Join date : 2015-02-23

    Compressed Air Powered Crossbow Empty Re: Compressed Air Powered Crossbow

    Post by benjaminh123 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
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 64
    Join date : 2013-10-07
    Location : Muskoka, Canada

    Compressed Air Powered Crossbow Empty Re: Compressed Air Powered Crossbow

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

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

    Sponsored content

    Compressed Air Powered Crossbow Empty Re: Compressed Air Powered Crossbow

    Post by Sponsored content


      Current date/time is Sat Jun 12, 2021 3:06 pm