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

» Codex Löffelholz crossbow
by stuckinthemud1 Tue Jan 24, 2023 4:14 pm

» Digitar prodsc
by stuckinthemud1 Sun Jan 15, 2023 2:42 pm

» Troubleshooting
by Andy. Fri Jan 06, 2023 12:29 pm

» Arab Crossbow
by kenh Thu Jan 05, 2023 8:39 pm

» Skane/Lillohus crossbow thread
by stuckinthemud1 Sun Jan 01, 2023 12:22 pm

» Wood Prods
by stuckinthemud1 Fri Dec 30, 2022 12:47 pm

» Colletiere a Charavines crossbow
by stuckinthemud1 Fri Dec 30, 2022 8:54 am

» Simplified Löffelhotz speedloader
by stuckinthemud1 Fri Dec 09, 2022 4:05 pm

» Fiberglass H-bows
by c sitas Sat Nov 12, 2022 8:44 am

» Bad Antler
by drawknife Sat Nov 12, 2022 3:48 am

» Anyone make their own bolts?
by Juniper Mon Oct 17, 2022 8:20 am

» Josef alm in English
by Juniper Sat Oct 15, 2022 4:22 am

» Qin/Han lock drawings
by kenh Fri Sep 23, 2022 8:16 pm

» stirrup dimensions?
by stuckinthemud1 Thu Sep 01, 2022 1:49 pm

» Skane/Lillohus lockbow information needed
by stuckinthemud1 Sun Aug 14, 2022 6:23 am

» need help contacting le musee Dauphinois Grenoble
by stuckinthemud1 Sat Aug 13, 2022 3:22 pm

» Low Draw Weight Build
by stuckinthemud1 Fri Aug 12, 2022 3:09 pm

» Trigger testing Rig/Jig?
by ora8i Fri Aug 12, 2022 1:13 pm

» best type of horn to use..
by stuckinthemud1 Fri Jun 24, 2022 6:13 am

» Han Dynasty Chinese Crossbow
by hullutiedemies Fri Jun 17, 2022 1:00 pm

» Drawing of Crossbow
by stuckinthemud1 Fri Jun 03, 2022 3:01 am

» "How To Make Everything": Early Crossbow
by stuckinthemud1 Thu Jun 02, 2022 3:41 am

» Black inlay
by stuckinthemud1 Fri May 13, 2022 3:18 pm

» Roller nut details
by drawknife Thu Apr 21, 2022 2:44 pm

» 330#/7" wood bow
by Anatine Duo Tue Mar 29, 2022 11:08 am


2 posters

    Why the ratchet in Greek gastraphetes can hold on the string force？

    stm2010
    avatar
    stm2010
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows


    Posts : 46
    Join date : 2013-01-08
    • Post n°1

    Why the ratchet in Greek gastraphetes can hold on the string force？ Empty Why the ratchet in Greek gastraphetes can hold on the string force？

    Post by stm2010 Mon Jan 29, 2018 8:15 am

    Why the rachet in Greek grastraphetes can hold on the string？
    I am afraid the string force on the sliding plate will cause the rachet leave out the teeth rail.
    Thanks for explanation on my question!

    https://www.youtube.com/watch?v=HTZ5a9FouVg



    Why the ratchet in Greek gastraphetes can hold on the string force？ 1517498829-2029
    F is the string force acting on the sliding plate.
    Will the f2 force pull out the claw from the  ratchet tooth  ?
    • Back to top
    Dark Factor
    Dark Factor
    Dark Factor
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there is a way.


    Posts : 68
    Join date : 2017-10-16
    Age : 38
    Location : Belgium
    • Post n°2

    Why the ratchet in Greek gastraphetes can hold on the string force？ Empty Re: Why the ratchet in Greek gastraphetes can hold on the string force？

    Post by Dark Factor Sun Feb 04, 2018 11:52 am

    Because the rail has a V cross section  (dovetail). You can only slide the trigger from the tip of the gastraphete.

    I'm making a gastraphete, so maybe in some months I could show you some pictures... if the corn bow works!

    The machine on the video isn't a gastraphete (the portable version), but I think that's also a dovetail rail.
    • Back to top
    stm2010
    avatar
    stm2010
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows


    Posts : 46
    Join date : 2013-01-08
    • Post n°3

    Why the ratchet in Greek gastraphetes can hold on the string force？ Empty Re: Why the ratchet in Greek gastraphetes can hold on the string force？

    Post by stm2010 Wed Feb 07, 2018 8:00 am

    Dark Factor，Thanks，I figure out this problem through some blue print of gastraphetes.

    The main function of ratchet is prevent the horizontal movements of the sliding plate.
    If well design the pawl shape, it also can aviod the  vertical movements of the sliding plate.
    • Back to top
    Dark Factor
    Dark Factor
    Dark Factor
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there is a way.


    Posts : 68
    Join date : 2017-10-16
    Age : 38
    Location : Belgium
    • Post n°4

    Why the ratchet in Greek gastraphetes can hold on the string force？ Empty Re: Why the ratchet in Greek gastraphetes can hold on the string force？

    Post by Dark Factor Wed Feb 07, 2018 12:20 pm

    Yes, it depends of the shape of the ratchet and its length (longer ratchet, less vertical force).
    But in the ancient text of Heron of Alexandria, he speak about a dovetail (which works perfectly).

    For biggest machines, I don't know exactely if there is a dovetail, but if there is a rope to bend the bow, there are less risk.

    here the french translation of the old greek text (sorry I speak better french than english) : http://remacle.org/bloodwolf/erudits/heronalexandrie/chirobaliste.htm
    • Back to top
    Sponsored content

    Sponsored content


    • Post n°5

    Why the ratchet in Greek gastraphetes can hold on the string force？ Empty Re: Why the ratchet in Greek gastraphetes can hold on the string force？

    Post by Sponsored content

    • Back to top

      Current date/time is Fri Feb 03, 2023 11:15 pm