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    how made homemade (reverse) crossbow ?

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    ali.j
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    how made homemade (reverse) crossbow ?

    Post by ali.j on Wed Nov 06, 2013 7:54 am

    ...


    Last edited by ali.j on Thu May 21, 2015 2:41 am; edited 3 times in total
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    Geezer
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    Re: how made homemade (reverse) crossbow ?

    Post by Geezer on Thu Nov 07, 2013 8:27 am

    Ali: The weight of your cams... the pulleys on the outer ends of the bowstave/prod, is Very Critical.  You want any weight out there to be as low as possible. Given availability of suitable materials, you could probably cut your cam-weight in half, which would substantially increase your performance. Geezer
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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Fri Nov 08, 2013 8:44 am

    ye mr geezer. Either way works well. and you can see today test Cool 




     and crossboe power is 54 kg = 119 pound ( lb)

    and cams wight in 76 gram Very Happy  

    Do you want to know how it's made? ( cams)
    Using a  4 metal washers and  one  bearings 




    I prefer to make all lonely. Even archery arrows 
    Leaves of palm tree...

















    my crossbow Until a week ago was ricrv but i czazy abou compound sistem so i chenge the crossbow to compound Cool 

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    Re: how made homemade (reverse) crossbow ?

    Post by Geezer on Fri Nov 08, 2013 9:13 am

    The video is good, and I appreciate your making things from locally available materials. 
    The bolts that hold your cams in place are longer than they need to be.  Cut them off flush, and the lost weight will go directly into your bolts.  Higher velocity, flatter trajectory, harder hitting. 
    Good luck.  Geezer
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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Tue Jan 14, 2014 3:22 am

    tanx mr Geezer this new video . change recrve to compund sistem



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    Re: how made homemade (reverse) crossbow ?

    Post by kenh on Tue Jan 14, 2014 6:19 am

    Nice work, Ali.  Geezer is right about making the cams as light as possible.  You may be able to find some nylon roller bearing such as those on some furniture.  Also make your cams usng only 2 washers, not 4.  As said above the extra energy will go into your bolts.

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    Re: how made homemade (reverse) crossbow ?

    Post by Hermit on Thu Jan 30, 2014 11:21 am

    Nice work Ali,ingeneous idea for the trigger mechanism.
                                                  Hermit.

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    Re: how made homemade (reverse) crossbow ?

    Post by Rizzar on Sat Feb 01, 2014 8:08 am

    Hey Ali!

    I like your work though the colors are not my taste (not only the blanket).   Wink 

    Especially the good idea with the trigger can ease work for many around here that are always searching for alternatives.


    But I do have concerns, too:
    To be honest what you have shown in the video when cutting out the limbs with a welding torch is one of the worst things you can to a leafspring in case you do not reharden and temper it properly.

    But, as I guess do not reach critical tension (low tip movement) on the limbs everything seems fine for your purpose.
    Just be sure to wear protection, keep a safety distance around and do not endanger someone when shooting.

    Greetings Rizzar
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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Tue Oct 07, 2014 6:40 pm

    my new proje. try to made a scorpyd rdt crossbow.

    firest sisine and made stock




























    the compound limbs ( hard steel )








    http://www.uploaddd.com/uploads/25_14140631452008111.jpg

    disine cams...
















































































    scope rile mading














    90% complate...










    made wincher




    http://www.aparat.com/v/2RjQ6
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    Re: how made homemade (reverse) crossbow ?

    Post by kenh on Tue Oct 07, 2014 6:52 pm

    Very  interesting!  More hand work than I want to do, but very nicely done!
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    Re: how made homemade (reverse) crossbow ?

    Post by Todd the archer on Wed Oct 08, 2014 2:20 am

    Great work, especially when you consider what you have to work with.

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    Re: how made homemade (reverse) crossbow ?

    Post by jeep on Wed Oct 08, 2014 12:04 pm

    Hurrah! for the brave!! And it look very powerful.. What is the weight of the beast?
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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Wed Oct 08, 2014 12:06 pm

    tanx. this lims power is 130 lbs I think that up to 180 _200 lbs power. soo today i tray to made a new hard steel lims. was so defecult to me.





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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Wed Oct 08, 2014 12:14 pm

    Rizzar wrote:Hey Ali!


    Especially the good idea with the trigger can ease work for many around here that are always searching for alternatives.

    ....
    .

    Greetings Rizzar

    tanx dear rizzar.
    in new crosbow proje i use an other trigger sistem. is faster reaction trigger and With very little pressure works (60 gram) 
    plz see this my video about new crossbow.




    '










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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Wed Oct 08, 2014 12:20 pm

    jeep wrote:Hurrah! for the brave!! And it look very powerful.. What is the weight of the beast?
    crossbow wight is 4.7 kg now.  and power limb is 130 pound

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    Re: how made homemade (reverse) crossbow ?

    Post by stm2010 on Wed Oct 08, 2014 8:47 pm

    Very comprehensive processes,you made everything manually。
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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Thu Oct 30, 2014 1:09 pm

    my home made rdt crossbow is 95% complate.  Cool

    its my home made rdt crossbow.  Cool










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    Re: how made homemade (reverse) crossbow ?

    Post by Todd the archer on Thu Oct 30, 2014 6:09 pm

    You are a craftsman! Good work>

    Todd

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    Re: how made homemade (reverse) crossbow ?

    Post by Andy. on Thu Oct 30, 2014 11:37 pm

    Yes great work!

    How does she shoot?
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Wed Nov 05, 2014 4:56 am

    today .... test.




    today Chronographi test
    31 grams ( 500 grain) arow shoting at 350 fps.

    and group shoting test 
    distance 35 meters
    home made rdt crossbow. 185 lbs.
    : ( red arrows home made 25 grams - gray arrows 31 grams horton)
    i need beter cams.
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Sun Nov 23, 2014 12:09 pm

    خب اینم یه پست بدون شرح تصویری. تعداد زیاد عکسها به منظور آشنایی با جزییات ساخت و مستندوار شدن پست هست. تا شاید بعد کسی بخواد بسازه روش های ساخت دستش بیاد؛ آلمینیوم آلیاژی شماره 7075 هست اهل فن میدونند یعنی سخت ترین نوع آلیاژ آلمینیوم و کارکردن باهاش باتوجه به امکانات ناچیز بنده بسیار سخت وبرای تکمیل همین یک کم دوروز وقت آزادم صرف شد. 

    ( عکس ها به ترتیب )



    Well here's a post without explanation. The large number of photos to be familiar with the details of construction and the post is documented. Maybe someone wants to build a way of making him come; No. 7075 aluminum alloy is an alloy of aluminum and expert knows that the hardest working very hard, I'm considering the meager facilities for the completion of this a little, two days was spent on the free time.
































    اینم کم جدیددرکنار کم ساندویچی قدیمی؛ فعلا وزنشون نکردم 


    old cam - new cam

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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Wed Nov 26, 2014 9:21 am

    new cam wight 168 grams. i made 2 new cam.

    soo  my rdt is complate 97%





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    Re: how made homemade (reverse) crossbow ?

    Post by kenh on Wed Nov 26, 2014 9:36 am

    Looking really good so far.  Now for the 3% string!
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    ali.j
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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Wed Nov 26, 2014 4:33 pm

    need string  and better fod place and Rubber bumpers string.

     tonight photos.











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    Re: how made homemade (reverse) crossbow ?

    Post by ali.j on Thu Nov 27, 2014 2:31 pm

    )






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