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    Best diameter delrin for nut ?

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    Best diameter delrin for nut ?

    Post by fester on Wed Jan 10, 2018 2:49 pm

    My build is a 105 lb armex glass prod and string. will 36mm diameter be big enough or should I step up to a 40mm nut. Also will 5mm pins be ok for the tickler and nut. I do intend to side drill the nut socket so the pin through the nut will be a retaining pin rather than taking any load.
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    Re: Best diameter delrin for nut ?

    Post by kenh on Wed Jan 10, 2018 4:38 pm

    I'd go for the 40mm diameter...
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    Re: Best diameter delrin for nut ?

    Post by Geezer on Thu Jan 11, 2018 8:05 am

    I usually use 1 and 3/8 in. diameter for Delrin nuts. Mostly I use Delrin for locks on bows from 70 to 150 lb. The occasional 170 lb. bow usually gets bone/horn.  For a trigger/tickler pin, I use a 12/24 machine screw, supported by an inlet nut on each end.  5 mm is closer to that used in medieval bows.   Having looked at a lot of medieval bows, it looks like bone rollers (mostly anteler... I use moose or axis stag when i can get it) anyhow... bone rollers on ancient bows vary from as small as 1 in. diameter on the original Padre Island bows to about 2 inch diameter on the big siege bow at the Kunsthistorisches Museum in Vienna.  The historical average for field bows seems to run betwen 1.25 to 1.5 inch diameter... about as wide as are deep.  Geezer
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    Re: Best diameter delrin for nut ?

    Post by Geezer on Thu Jan 11, 2018 10:23 am

    Further bone nut info: I've never seen a bone nut narrower than about 1 inch.  Bone nuts for very strong bows have steel/iron reinforcing pins running thru the lugs, down well into the solid part of the bone.  I do that occasionally on my bows for authenticity, though in fact I don't generally build bows strong enough to require it. Like the common steel/iron rivet thru the stock (top to bottom) just behind the prod/lath socket.  Not really necessary in a light sporting bow, but very common in strong medieval bows...  and it looks rather spiffy.  Geezer.
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    Re: Best diameter delrin for nut ?

    Post by Crossbowmen on Thu Jan 11, 2018 12:01 pm

    Do you have any picks of your work, or am I unable to see them  ???  Shocked
    If only got a outside workshop and its freezing cold so I'm sitting on top of my ideas for at least another view months. Really love the work of ZNA Productions, have you seen his latest crossbow ??
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    Re: Best diameter delrin for nut ?

    Post by Geezer on Thu Jan 11, 2018 12:08 pm

    Pics of MY work?  Sure, just go to my website www.crossbows.net  There's a gallery.  Geezer

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