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

» Troubleshooting
by Cscott Tue Nov 15, 2022 11:55 am

» 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

» Colletiere a Charavines crossbow
by stuckinthemud1 Sun Oct 16, 2022 3:39 pm

» 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

» starting a 1400's replica
by stuckinthemud1 Thu Feb 24, 2022 1:26 pm

» 18th century German crossbow reproduction
by Fangbows Sun Feb 20, 2022 7:15 am

» replacement for baleen?
by tghsmith Mon Jan 17, 2022 9:30 am

» Medieval crossbow finished
by stuckinthemud1 Wed Jan 12, 2022 3:05 pm

» Trigger mechanisms
by stuckinthemud1 Mon Jan 03, 2022 10:23 am

» Finish wooden stock
by stuckinthemud1 Sat Dec 25, 2021 9:06 am


4 posters

    New leaf spring prod idea.

    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 58
    Location : New York

    New leaf spring prod idea. Empty New leaf spring prod idea.

    Post by Zardoz Fri Dec 21, 2012 3:48 pm

    I have an idea for a leaf spring prod that would compensate for the weak area around the center hole. Have a look at this drawing. Do you think this will work?

    https://i.servimg.com/u/f11/18/00/01/77/zardoz13.jpg
    septua
    septua
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 76
    Join date : 2012-12-02
    Location : Ohio

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by septua Fri Dec 21, 2012 8:36 pm

    I have seen many crossbows with what are called center shot
    designs. Why can’t a prod with a center hole be adequately reinforced to
    accomplish the same end? Is it due to historical correctness or balance
    considerations?
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 58
    Location : New York

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by Zardoz Fri Dec 21, 2012 9:06 pm

    I am planning this for a medieval style cross ow
    septua
    septua
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 76
    Join date : 2012-12-02
    Location : Ohio

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by septua Sat Dec 22, 2012 1:29 am

    This may be obvious but mounting the prod can done to a
    correct medieval style by creative clamping design giving emphasis to the area
    across the front of the tiller, and not just at the two zones where the bow
    irons pull. Basically I mean using a metal bolster plate that puts adequate
    pressure across the front thus preserving the look that you want. The bow irons
    would apply force to the plate but the thrust will be distributed more evenly
    across than usual. The cord binding method I’ve seen sometimes has a bolster or
    plate like this made from wood.

    New leaf spring prod idea. Pressu10
    avatar
    Rizzar
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 194
    Join date : 2012-08-11
    Location : Germany

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by Rizzar Sat Dec 22, 2012 2:12 am

    The "bridle socket" you saw on medieval cord bindings is good to dristribute the binding pressure to the center of the prod.

    You are right, with clamps and plates you can stiffen the center very good, but the clamps must be very tight and stay this tight which is the difficulty.
    Though I think a bolt through the center hole with stiffening plates will do its duty pretty well and you even can hide it unter the bridle socket and cord binding if done properly.

    The center shot is not very historical and due to the forces applied to the center not very practical.

    Zardoz, to your design suggestion:
    Let´s say it simple: every corner in any design is a weakening spot.
    There will be a misbehaviour between the fade out and the working area, the material will need to compensate different forces and in my understanding be a very weak spot.

    Greetings Rizzar
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 58
    Location : New York

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by Zardoz Sat Dec 22, 2012 4:25 am

    I planned on using a binding block, but I didnt mean to put a corner between the fade and the working section. I wrote in the drawing to blend it in. Would a more gradual transition do the trick?
    avatar
    Rizzar
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 194
    Join date : 2012-08-11
    Location : Germany

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by Rizzar Sat Dec 22, 2012 8:47 am

    As I mentioned before I would stay with the stiffened triangular design.
    It is easy to produce and you most likely won´t run into trouble.

    It
    is a bit hard to describe, but regarding to all the information i
    collected until now a taper that is more "aggresive" than a triangular
    is leaving weak areas.
    So if you go from the center of the prod (the
    area the limb begins concerning the stiffened area) you should have a
    linear taper in cross section.
    New leaf spring prod idea. Taper10
    (don´t forget the complete center is stiffened, otherwise the triangle begins in the middle of the prod)

    For optimal force distribution a perfect triangle (100% to 0% cross section) would be the best.
    Most medieval bows show values of about 35-40% of the centers cross section at the beginning of the tips.

    Greetings Rizzar
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 58
    Location : New York

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by Zardoz Sat Dec 22, 2012 12:30 pm

    I guess it's back to the drawing board. I may just go back to my original plan to use Power Tuff.
    mac
    mac
    Master Weaponsmith
    Master Weaponsmith


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

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by mac Sat Dec 22, 2012 7:54 pm

    Zardoz,

    If you do go back to the drawing board, you might want to reconsider the 2" tiller width that you spec in your drawing. As near as I can tell, most tillers were a lot closer to 1" than to 2". A nice thin tiller goes a long way toward making a bow look good.

    Mac
    Zardoz
    Zardoz
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 88
    Join date : 2010-12-31
    Age : 58
    Location : New York

    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by Zardoz Sat Dec 22, 2012 10:58 pm

    2" was just for illustration. The graph paper was 1/4 inch sqares.

    Sponsored content


    New leaf spring prod idea. Empty Re: New leaf spring prod idea.

    Post by Sponsored content


      Current date/time is Thu Dec 01, 2022 8:27 pm