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» Roller Nut Size
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    Roller Nut Size

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    banuvatt
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    Post by banuvatt on Wed Oct 30, 2019 7:17 pm

    One of the crossbows I made, it comes out at a draw weight of 36 lbs at 10." Another crossbow I plan to make it's going to be a stonebow I don't know what the draw weight is going to be maybe from 40 lbs to at max 70 lbs. What size in diameter should my roller nut be?
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    Roller Nut Size Empty Re: Roller Nut Size

    Post by kenh on Wed Oct 30, 2019 8:37 pm

    With those low-draw-weights, almost any roller nut diameter will work.  You could make the whole thing "small and elegant" with a 1" or 1.25" roller; or more "robust" with a 1.5" to 2" roller.
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    Post by banuvatt on Thu Oct 31, 2019 4:01 pm

    Okay thanks, if I want to make a 1" roller nut how high should the fingers be? Also, how do you make the fingers of the nut?
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    Post by kenh on Thu Oct 31, 2019 5:09 pm

    The fingers need to be taller than the string diameter.
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    Roller Nut Size Empty Re: Roller Nut Size

    Post by Geezer on Thu Oct 31, 2019 7:35 pm

    My long standing rule of thumb is to bury the roller nut in a socket by 2/3 to 1/3.  If you're going to use a one inch nut, the lugs will be about 1/3 of an inch high.  Generally speaking lighter nuts of the same material will release quicker than heavier (larger) ones.  I have seen actual medieval nuts from 1 inch on the little Spanish Padre Island bows, to something over 2 inches diameter on the big Siege bow at the Kunsthistorisches museum in Vienna.  I will offer one caveat for smaller nuts. Generally speaking, you want the nut to fit its socket fairly closely so it doesn't rattle around, but not so closely that normal expansion and contraction of the stock due to humidity will cause the nut/socket to freeze up.  Very small nut and socket can make it harder to find the optimal fit.
    Given how light your bows are, I recommend you stay with the smaller sizes.  Personally I'd go for about inch and a quarter.  Have fun stormin' the castle!  Geezer.
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    Post by banuvatt on Thu Oct 31, 2019 7:59 pm

    Okay thank you very much for your advice.

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