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

» 12th Century Chinese Crossbow Chronographed
by stuckinthemud1 Fri Nov 24, 2023 3:50 pm

» Crossbow Stock
by kenh Tue Oct 31, 2023 6:19 am

» Colletiere a Charavines continuing experiment
by stuckinthemud1 Sat Oct 07, 2023 5:36 am

» Cocking - how
by stuckinthemud1 Thu Aug 03, 2023 4:24 am

» Questions around heavy crossbow lath buildin
by stuckinthemud1 Wed Apr 26, 2023 1:10 am

» Arab Crossbow
by stuckinthemud1 Tue Apr 25, 2023 7:57 am

» prod angle, and lever trigger for sale anyone?
by stuckinthemud1 Mon Mar 20, 2023 5:54 am

» flexible string
by jasper1978 Mon Mar 20, 2023 1:25 am

» [solved]Skane/Lillohus crossbow thread
by stuckinthemud1 Sun Mar 19, 2023 7:44 am

» jens sensfelder
by jasper1978 Wed Mar 08, 2023 11:58 pm

» 400lb Windlass crossbow bolts weight and accuracy shooting high.
by stuckinthemud1 Sun Mar 05, 2023 2:53 pm

» Codex Löffelholz crossbow
by stuckinthemud1 Tue Jan 24, 2023 4:14 pm

» Digitar prodsc
by stuckinthemud1 Sun Jan 15, 2023 2:42 pm

» Troubleshooting
by Andy. Fri Jan 06, 2023 12:29 pm

» Wood Prods
by stuckinthemud1 Fri Dec 30, 2022 12:47 pm

» Colletiere a Charavines crossbow
by stuckinthemud1 Fri Dec 30, 2022 8:54 am

» Simplified Löffelhotz speedloader
by stuckinthemud1 Fri Dec 09, 2022 4:05 pm

» 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

» 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


4 posters

    Reinforcing a Wooden Nut

    Xamllew
    Xamllew
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 72
    Join date : 2015-06-13
    Age : 32
    Location : Florida

    Reinforcing a Wooden Nut Empty Reinforcing a Wooden Nut

    Post by Xamllew Sun Jul 26, 2015 3:47 pm

    Hello folks, I'm currently working on my first xbow and I'm pretty limited on materials to make a nut out of, so I decided on 3 laminates of .5" oak with the grains running in different directions, first layer runs vertical, middle horizontal, and third vertical same as first. I'm pretty happy with the results but I still feel like a split could occur with anything over a 100lb draw weight. I already have plans to reinforce the surface where the tickler will sit with a small metal plate, but I'm more worried about the fingers that hold the string.

    My only plan right now is either to coat the entire nut in epoxy or superglue to give it an added level of hardness, or perhaps fire hardening it would be another option although I can see a lot of problems with this too (not sure how the glue will react to the temperature).
    avatar
    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 547
    Join date : 2012-11-24

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by c sitas Mon Jul 27, 2015 11:49 am

    How about laminating two pieces metal on each of the outer sides. I would run three or four  screws through the sides. Sink them flush, then pull apart and glue with industrial epoxy. Tighten the screws before the glue sets up .Would end up like a rock.Your metal plate could be incorporated into the whole thing. I'm a welder and I could weld the plate to the sides with a perfect fit.Make two wooden plugs and use one for making this assembly. This metal could also be make in one piece with some careful work
    Xamllew
    Xamllew
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 72
    Join date : 2015-06-13
    Age : 32
    Location : Florida

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by Xamllew Mon Jul 27, 2015 1:18 pm

    c sitas wrote:How about laminating two pieces metal on each of the outer sides. I would run three or four  screws through the sides. Sink them flush, then pull apart and glue with industrial epoxy. Tighten the screws before the glue sets up .Would end up like a rock.Your metal plate could be incorporated into the whole thing. I'm a welder and I could weld the plate to the sides with a perfect fit.Make two wooden plugs and use one for making this assembly. This metal could also be make in one piece with some careful work

    That sounds like it'd do the trick. It could be done with sheet metal thin enough for me to cut, but I haven't got the tools needed for cutting anything too thick into the profile of the nut. How thick do you think the plates would need to be?
    avatar
    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 547
    Join date : 2012-11-24

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by c sitas Mon Jul 27, 2015 4:45 pm

    Some 1/16" stuff would work great. My thoughts,and just a suggestion, would be to bend the whole thing from one piece. You could make practice piece's out of some valley tin or aluminum. Do that to get your width of the roller. Once you have how wide good,it would be a simple matter to cut the sides out . Picture this, you'll have an axle right? Then I would put one bolt just below the floor of the fingers, and the other one some where ahead of the sear .Use taper headed screws. You could carefully tape threads for the screws and use "red" locktight  to put it together.
    avatar
    rolynd
    Techno Weeny

    Lets put a laser on it!!!


    Techno WeenyLets put a laser on it!!!


    Posts : 56
    Join date : 2011-05-16

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by rolynd Tue Jul 28, 2015 8:15 am

    Well, what kind of materials other than wood can you get? Just coating it with epoxy on the outside will not make it take more load.

    Delrin(/POM as its called here) is relatively easy to work even with hand tools and has been used for roller nuts in previous builds. small scrap pieces are always on ebay here and cost a pittance.

    If you cant get that and have to use wood a sheet metal reinforcement as suggested would be certainly a good idea. I would hesitate to trust a merely wooden nut with larger draw weights.

    If you can get steel round stock of sufficient diameter (old axles , large bolts, etc from the scrapyard for example)  cutting off a bit with a hacksaw and shaping with files is entirely doable - requires a bit of elbow grease though, you wont be finished in 5min... But much better than having the fingers break at an inopportune moment...

    I have even seen one made from several stacked and interconected metal washers if the central hole is not too big.

    as said a simple wooden roller nut is only for low draw weight...wood is good for the tiller.
    Xamllew
    Xamllew
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 72
    Join date : 2015-06-13
    Age : 32
    Location : Florida

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by Xamllew Tue Jul 28, 2015 7:17 pm

    rolynd wrote:Well, what kind of materials other than wood can you get? Just coating it with epoxy on the outside will not make it take more load.

    Delrin(/POM as its called here) is relatively easy to work even with hand tools and has been used for roller nuts in previous builds. small scrap pieces are always on ebay here and cost a pittance.

    If you cant get that and have to use wood a sheet metal reinforcement as suggested would be certainly a good idea. I would hesitate to trust a merely wooden nut with larger draw weights.

    If you can get steel round stock of sufficient diameter (old axles , large bolts, etc from the scrapyard for example)  cutting off a bit with a hacksaw and shaping with files is entirely doable - requires a bit of elbow grease though, you wont be finished in 5min... But much better than having the fingers break at an inopportune moment...

    I have even seen one made from several stacked and interconected metal washers if the central hole is not too big.

    as said a simple wooden roller nut is only for low draw weight...wood is good for the tiller.

    The only other material I have at my disposal is aluminum round stock but that's solid metal, I could sooner order a pre-made delrin nut and have it at my doorstep than to try to file and hack away at that stuff with the tools I have. I do like the metal washer idea, although there's still a lot of elbow grease in doing that as well.

    I'm going to give the plating idea Sitas mentioned a try since I've got some ready to use. I'm aiming to have it hold at around 150 lb draw. I've used oak for similar weight bearing functions before and I kinda trust it to hold up pretty well however testing will be performed alone in the woods so a failure shouldn't be much of a concern for safety.

    I appreciate the ideas.
    avatar
    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 547
    Join date : 2012-11-24

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by c sitas Wed Jul 29, 2015 8:46 am

    Just between you and I, you won't have to worry about a failure. At least from the  nut ,I had to stop and think how to word. Don't want to offend anyone .If you go this route, after you have the nut finished,then make every effort to file or sand a good square face on the metal on the nut. Just has to be where the sear will ride.Also want the bottom nice and square. This will help the sear break nice and clean. Take polishing cloth and really smooth the area of the top fingers. Don't want to nick a string.Don't try to harden anything.
    avatar
    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 547
    Join date : 2012-11-24

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by c sitas Wed Jul 29, 2015 9:10 pm

    You know; The only reason I'm working here with a wooden nut is that's what you mentioned . I firmly believe it can be done safely. Is it the quickest and best , maybe not .  I use delrin but , you have to have the machinery to work with it . I use a plate where my sear rides. I'd trust them  period. I don't see my self ever needing more than say 2 or 2.5  hundred  pds. pull . I anchor my plates with red loctite and two 8/32 set screws, one each side. I use a three trip trigger. It works smooth. Ya there is some extra travel but I could eliminate that with a set trigger just like Todd did. I don't see it as a problem.Using your brain here is what this is all about. That is what really makes this forum so fantastic. If your all wet, someone  will pipe up and respectfully tell  you. I love that , as I'm a go for broker and make worker type.
    OrienM
    OrienM
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?


    Posts : 195
    Join date : 2014-08-01
    Age : 47
    Location : New Mexico, USA

    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by OrienM Fri Aug 14, 2015 9:38 am

    I made a wooden nut, and it worked out OK. My advice would be to use more, thinner wood laminates (thin enough that each finger has several lams in it) and to rotate the grain direction of some of the laminates 90 degrees, plywood-style, for more strength.

    Also, Red Oak is probably not the best wood choice...something harder and more consistent in texture would be better. I'd suggest hard maple, or maybe an exotic hardwood...I used ziricote in mine, a Mexican hardwood fairly similar to ebony.

    Sponsored content


    Reinforcing a Wooden Nut Empty Re: Reinforcing a Wooden Nut

    Post by Sponsored content


      Current date/time is Fri Feb 23, 2024 5:24 am