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    First Project by jds6

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    jds6
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    First Project by jds6

    Post by jds6 on Fri Nov 11, 2011 10:51 pm

    Just about finished with the tiller, a couple of holes for the lever and nut and a good finish. Only one more thing to do at this stage, bolt groove. Can anyone please advise me which direction to take, what size, how deep, etc.. thanks for any response in advance..


    Last edited by Ivo on Sat Nov 12, 2011 3:41 pm; edited 1 time in total (Reason for editing : title)
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    Re: First Project by jds6

    Post by Ivo on Sat Nov 12, 2011 1:27 pm

    Hi jds6,

    The basic dimensions of the groove will depend on two things.


    1. String diameter
    2. Bolt/arrow shaft diameter.

    String diameter is important because you will need to know how high does the string mid-line sits above the track surface(keep in mind...serving material counts). Then you measure the diameter of the shaft you are planing on using. Place those dimensions one over the other so that the string contacts the nock of the bolt in the center. After that simply plot a "v" type groove and you should have your track dimensions.

    Didn't have medieval tiller example, but this is just as good (just ignore the deep groove cut for the third fletch)



    The "V" groove ca be cut with a router using a "V"-bit.

    Ivo

    PS: Got any pictures of your project? Not only would it be cool to just see how you're doing, but also will be easier to help you out with what ever questions that come up as you dive deeper. Smile




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    jds6
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    Re: First Project by jds6

    Post by jds6 on Sat Nov 12, 2011 3:43 pm

    Thanks for the response Ivo. I will be using a150# prod and string from Alchem. I have read that their strings are a little smaller in diameter. Any input on this would be helpful as well.H ere is a pic of what I have completed so far.(hard work all done by hand no power tools)
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    Re: First Project by jds6

    Post by Paulius on Sun Nov 13, 2011 9:12 am

    Hi jds6,

    I would like to ask how did you cut the hole for nut? Is it possible do do with simple chisel? ( I am interested, becauce I have never tried to make semi round hole/mortise)

    And also, did you make the nut only by hand tools too?
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    Re: First Project by jds6

    Post by jds6 on Sun Nov 13, 2011 1:04 pm

    hello Paulius, In answer to your question about the hole for the nut, the picture is a little decieving. The tiller consist of three pieces of oak. The mortise was cut out of the center piece. The chisel work was donon the outer two allowing for the roller nut. As far as the roller nut itself, yes it was done all by hand. Drawn out, cut with a cooping saw, rasping and alot of sanding. Hard work, but rewarding. I hope this answers the questions you had. Now time to work on the groove in the tiller. A bit scared, doing it by hand also. Affraid if I get off a little the bolt will not fly straight. Won't know until I try.
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    Re: First Project by jds6

    Post by Paulius on Sun Nov 13, 2011 2:05 pm

    Thank you for answers, jdc6, and good luck with bolt groove. I found it being the hardest part, when I was making my crossbow, and it went not quite well (I have used semi round gouge for that job).
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    Re: First Project by jds6

    Post by jds6 on Sun Nov 13, 2011 2:15 pm

    Thanks for the incouragement Paulius, maybe a semi round gouge would be easier than a v-groove, especially done with hand tools .Probably easier to sand also, keeping the groove more uniform. Might just give it a try
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    Re: First Project by jds6

    Post by Todd the archer on Sun Nov 13, 2011 3:53 pm

    Hi all, just a comment if I may. I notice in your picture you made the nut from wood. Was wondering what kind? I myself have made nuts from wood using walnut in my case. But what I noticed with yours was the orientation of the grain. I believe that the grain should be completely vertical when in the cocked position for maximun strength. Also I make my wood nuts 1 1/2" wide to allow each finger to be as strong as possible. Here is a pic of one I made hope you can see the grain:



    I have used it on a 157# pound crossbow
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    Re: First Project by jds6

    Post by jds6 on Sun Nov 13, 2011 8:52 pm

    hey Todd, Thanks for the insight on the roller nut. Makes sense to me now on which way the grain should run on the nut(new to all this) I have no idea what kind of wood though. Pick it up on one of the job sites. It was being used for some railing on steps. Should I try a different kind, or do you think this might work? Really like the look of the roller nut made from walnut.
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    Re: First Project by jds6

    Post by Todd the archer on Mon Nov 14, 2011 3:19 am

    Looks like pine although oak and other woods are use for steps and railing as well. Pine is kind of soft and on the weak side. I would try to get some kind of hard wood maybe maple, hickory, or perhaps osage orange if you can get some.



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