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

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» 12th Century Chinese Crossbow Chronographed
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4 posters

    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

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    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

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    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!


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    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

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    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
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    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

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    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
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    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


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

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

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