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    New hunting Crossbow

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    kiwijim
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    New hunting Crossbow

    Post by kiwijim on Fri Apr 09, 2010 1:02 am

    Hi Guys
    Just finished this in time for a 3 day hunting trip. Looking foward to putting some serious hurt on some goats , and maybe, hopefully, a red deer .
    This crossbow is a bit of an assembly. The trigger, irons, trigger guard and stirrup have been made by other people, so I can't take credit for those components.

    Anyway, the specs are:
    Draw weight: 300#plus at 13" powerstroke.
    Prod: Powertuff with micarta overlays
    Trigger: Excalibur
    Tiller: Homemade blackwalnut plywood
    Barrel: Bloodwood and Hickory
    Bow irons: trigger guard and stirrup: Purchased roughed out.
    Buttplate: sideplates and sights: Brass
    String: Fastflite
    Finish: Tru Oil on wood. Caustic bluing on iron.

    </A>"
    </A>"
    </A>"
    </A>"
    </A>"
    This crossbow is a bit of a brute, and is an effort to load even with the Excalibur twin pulley cocking aid.
    It does, however, shoot it's 1250grain hunting bolts extremely quickly !
    I have the peep sights zeroed for 25m and have been pleasently suprised with it's accuracey.

    Anyway, better go and pack!

    Regards
    James
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    Re: New hunting Crossbow

    Post by Todd the archer on Fri Apr 09, 2010 4:03 am

    That looks awesome. Did you make that prod. What are it's specs (length, thickness). Looks very classic .

    Here's a pic of my ecal with a walnut stock (tiller) that I made:



    Good luck hunting, BTW what arrows (bolts) are you using?, Todd
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    Re: New hunting Crossbow

    Post by Ivo on Sat Apr 10, 2010 2:06 am

    Well kiwijim,

    You certainly know how to please the eye of the audience ...Excellent stock finish and over all craftsmanship! All 10\'s

    And who really gives a damn about "assembly"...in one way or another we use something made or invented by someone else...so I got your back on that one. first place

    Todd, wicked stock...I bet it feels great walking into the woods with it. Smile

    I wish you two and all with us - Good clean shots and Short blood trails! Very Happy And of coarse Happy Birthdays to you two as well. Happy B-Day




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    Re: New hunting Crossbow

    Post by Basilisk120 on Sun Apr 11, 2010 3:58 pm

    Those are both fine looking bow. They really look like they belong out in the woods on a hunt.



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    Re: New hunting Crossbow

    Post by kiwijim on Mon Apr 12, 2010 8:56 pm

    Hi Guys,
    Well I'm back. Thanks for all the nice comments. To tell you the truth, I considered that crossbow a tiny bit rough. (lucky my camera has low resolution! )I was in a real hurry to get it complete for this trip
    Unfortunately, no goats were harmed in the testing of this crossbow . Pest control had been down there and eradicated most of them. The survivors were very hard to get close to! Saw quite a few rotting carcus. What a waste of good, organic and free range meat!
    On the bright side, we caught (and released) quite a few trout. The smallest was 2.75lb. The largest 4.25lb. All wild fiesty rainbows in surperb condition . And I got to test out some new fly designs, including a dry that I am now rather proud of- so the trip was not a total lose.

    Hey Todd,
    I cut the bolts out of fibreglass rod (9mm diameter). I like them because they are heavy, strong and cheap. I get 5 out of a 2m($7.50) rod.
    The prod is 34" NTN. It is cut and ground from a 1.5"wide x 0.495" thick length of power tuff. The centre 2" are a parallel 1.5" wide x 0.495" thick. From this central section the limbs taper to 0.75" wide X 0.365" tick tips. Thickness taper, as Pavise observed, has been ground into the belly. The back is unground. The overlays are epoxied onto the tips and have been reinforced with a 4mm fibreglass rod pin to prevent them flying off. I also like to glue a small piece of leather on the back to protect the prod from the bow irons.
    From my experience, Powertuff makes a good prod. If you combined it with a magnificent walnut stock, like the one you made, and a crisp trigger like some of the designs shown on this site, well, thats a better crossbow than nearly anything you can buy.

    Regards

    James
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    Power tuff question

    Post by Zardoz on Sat Nov 17, 2012 8:10 am

    kiwijim wrote:Hi Guys
    Just finished this in time for a 3 day hunting trip. Looking foward to putting some serious hurt on some goats , and maybe, hopefully, a red deer .
    This crossbow is a bit of an assembly. The trigger, irons, trigger guard and stirrup have been made by other people, so I can't take credit for those components.

    Anyway, the specs are:
    Draw weight: 300#plus at 13" powerstroke.
    Prod: Powertuff with micarta overlays
    Trigger: Excalibur
    Tiller: Homemade blackwalnut plywood
    Barrel: Bloodwood and Hickory
    Bow irons: trigger guard and stirrup: Purchased roughed out.
    Buttplate: sideplates and sights: Brass
    String: Fastflite
    Finish: Tru Oil on wood. Caustic bluing on iron.

    "
    "
    "
    "
    "
    This crossbow is a bit of a brute, and is an effort to load even with the Excalibur twin pulley cocking aid.
    It does, however, shoot it's 1250grain hunting bolts extremely quickly !
    I have the peep sights zeroed for 25m and have been pleasently suprised with it's accuracey.

    Anyway, better go and pack!

    Regards
    James

    I know this is an old post, but when you used the power tuff, was that the black or grey color, and did you have any problems with the unidirectional fibers coming apart? I was going to try one with a fiberglass backing with a scrim to give a little cross strength to prevent splitting. If it's not necessary, I don't want to make extra work for myself. Thanks.

    Pat
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    Re: New hunting Crossbow

    Post by kiwijim on Sun Nov 18, 2012 2:01 am

    After reading the silly quote you sign you posts with, I almost didn't bother replying but:

    Grey powertuf has been ground both sides- it will lift splinters on the back. You want powertuf that is unground on one side. That unground side will appear black and shiney- that is to be the back of the prod.

    James
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    Re: New hunting Crossbow

    Post by Zardoz on Sun Nov 18, 2012 5:36 am

    kiwijim wrote:After reading the silly quote you sign you posts with, I almost didn't bother replying but:

    Grey powertuf has been ground both sides- it will lift splinters on the back. You want powertuf that is unground on one side. That unground side will appear black and shiney- that is to be the back of the prod.

    James

    Thanks, Jim. The quote is from the movie, "Zardoz", a cheezy early Sean Connery film.
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    Re: New hunting Crossbow

    Post by Todd the archer on Sun Nov 18, 2012 6:04 am

    Another question for you Jim, when making your prod is the front view taper even on both sides or did you take off from bottom side to get the string nocks center line up higher for less string drag?



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    Re: New hunting Crossbow

    Post by kiwijim on Sun Nov 18, 2012 12:12 pm

    Hi Todd,

    You're right in your thinking. From the front view, the top edge of the prod is absolutely straight. All the taper is on the bottom edge.



    Regards James

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    Re: New hunting Crossbow

    Post by chaz on Sun Nov 18, 2012 12:16 pm

    Hey James,

    Where does one buy the powertuf stuff ? Sounds like a very reasonable price for prod material. What was your technique for tapering the thickness ? I invision for using a jig and a router. Please elaborate. Very nice looking work in total , and sound very effective.

    Thanks for sharing

    Chaz
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    Re: New hunting Crossbow

    Post by Zardoz on Sun Nov 18, 2012 12:52 pm

    You can get it from Bingham Projects. You have to call or email them. A 36 inch by 2 inch by 1/2 inch thick piece is About $33.
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    Re: New hunting Crossbow

    Post by kiwijim on Mon Nov 19, 2012 2:58 am

    Hey Chaz,

    First I rough cut out all the tapers with a carbide tipped bandsaw blade. I then tidy up all the saw marks on the belt sander. Finally I grind the taper on the belly of the bow using a tapered board and a drum sander- the same way as you would grind tapered lams for a bow.
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    Re: New hunting Crossbow

    Post by Hotspur on Mon Dec 03, 2012 3:52 pm

    kiwijim wrote:
    ...the specs are:
    Draw weight: 300#plus at 13" powerstroke.
    Prod: Powertuff with micarta overlays
    ...

    Hi James,

    With the prod, what was your process for deciding brace height and powerstroke?

    Ernest

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    Re: New hunting Crossbow

    Post by Stonedog on Mon Dec 17, 2012 5:49 pm

    What a beauty!

    Quick question:

    How sturdy do you find that type of front sight? Do you find it easy to knock out of alignment?

    Also, where did you get that trigger and release assembly?

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    Re: New hunting Crossbow

    Post by thornwarbler on Tue Dec 18, 2012 8:51 am

    There are some talented builders on here. Fantastic work!
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    Re: New hunting Crossbow

    Post by Hotspur on Tue Mar 11, 2014 7:50 am

    kiwijim wrote:Hey Chaz,

    First I rough cut out all the tapers with a carbide tipped bandsaw blade. I then tidy up all the saw marks on the belt sander. Finally I grind the taper on the belly of the bow using a tapered board and a drum sander- the same way as you would grind tapered lams for a bow.


    Hi Kiwi, fellow Guild,

    Can someone point me in the direction to learn more about the "...[size=13.333333969116211]using a tapered board and a drum sander- the same way as you would grind tapered lams for a bow"?[/size]


    [size=13.333333969116211]Ernest[/size]
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    Re: New hunting Crossbow

    Post by actionbow on Wed Mar 12, 2014 10:38 pm

    Very nice work. You got me thinking about a powertuf prod now.

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