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

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

» 330#/7" wood bow
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» Medieval crossbow finished
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» Trigger mechanisms
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» Finish wooden stock
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2 posters

    Nut Diagram

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    banuvatt
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    Nut Diagram Empty Nut Diagram

    Post by banuvatt Fri Nov 08, 2019 11:15 am

    Nut Diagram Armbrus_artikel-nuss
    I found this diagram of a roller nut on this website http://www.xn--templerbhl-lcb.de/articles.php?article_id=1. I believe I have also seen it before in a Youtube video.
    Geezer
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    Nut Diagram Empty Re: Nut Diagram

    Post by Geezer Wed Nov 13, 2019 12:20 pm

    The nut diagram is reasonable, but will work better if the step cut in the bottom for the trigger to engage, is cut as a discrete pocket, leaving the roller essentially round on the bottom. A full step across the bottom will encourage the nut to oscillate as it rolls over in the socket.  A fully rounded bottom makes the nut run smoother.  You'll have fewer problems and a smoother release.  Geezer.
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    Nut Diagram Empty Re: Nut Diagram

    Post by Geezer Wed Nov 13, 2019 12:25 pm

    Second thought concerning the above nut diagram.  Try moving the sear-notch back, @ 5 mm behind dead center. Having the sear at dead center encourages the roller to rise in its socket under load, stressing the roller-socket's edges. Moving the sear-step back 5 mm will let the end of the trigger to take more of the rising load, which reduces stresses on the nut-socket.  Note late 15th century locks with two or more axles moved the sear to the back of the roller, rather than the bottom. That helps reduce the socket load even more, but pretty much requires a double-axle and seperate toggle to engage the sear.  I hope this make sense.  Geezer.
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    Nut Diagram Empty Re: Nut Diagram

    Post by banuvatt Wed Nov 13, 2019 1:53 pm

    Okay thank you very much for your advice, it made sense.

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