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» Best diameter delrin for nut ?
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» My 2nd crossbow project - german crossbow with cranequin
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» Old Powermaster project & question.
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» Medieval composite bows
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» Powermaster
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» Best wood for a novice?
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» Adding a steel sear insert?
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» Great Machines
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» Medieval Crossbow Bolts DIY Question
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» Berkhamsted Castle and Glasgow Museum wooden prod crossbow
by Juniper Fri Aug 25, 2017 3:54 pm


    opinions please

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    rickraedeke
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    opinions please

    Post by rickraedeke on Thu Jul 06, 2017 2:24 pm

    Building my first crossbow. Just wondering: is aluminum bar ok for my rolling nut? T
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    Onager Lovac
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    Re: opinions please

    Post by Onager Lovac on Thu Jul 06, 2017 2:37 pm

    Just about anything is good enough for a rolling nut if reinforced with a bit of steel, but if i we're using aluminum by itself i wouldn't use a prod that pulls more than 90 pounds.
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    Geezer
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    Re: opinions please

    Post by Geezer on Thu Jul 06, 2017 10:19 pm

    I have used aluminum bar stock for roller nuts in the past.  In fact, it's very strong, if you fit a bit of steel allthread rod for a sear.  So much for the good news.
    The bad news is: aluminum is a bitch to cut... very sticky and surprisingly hard to cut and harder to file.  When you get your aluminum nut made, and a steel sear plug inserted in the bottom, you'll discover the stuff oxidizes on the outer surface.  This oxide wears off on the inside of the nut-socket and also gets spread all over the top (table) of the stock... The first few shots you make after it's been sitting a while, will hang up a bit.  After that, it should shoot okay. If you can live with the grey oxide all over the top of your stock, you should be good. 
    Personally I recommend Delrin rod for a roller-nut, or if you have access to a decent lathe, get a piece of moose-horn (base of the horn, where it comes off the head) and turn that down for a nut.  It's what the ancients used.  Geezer.

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