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    first fire and deviations. HELP!!

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    ferdinand
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    first fire and deviations. HELP!!

    Post by ferdinand on Sun Apr 29, 2012 11:00 am

    I need ur help guys.
    After a few shots i made a nice group of arrows but i have a problem.
    Elevation is fine, but my arrows go left!
    I tried shifting the prod left and right but cant really make out any difference in direction of the shots.
    In theory one side should be stronger, but does it mean that the right hand part of the prod makes the shots go left when it is stronger? ore vice versa?
    Anyone know the theory behind these deviations?

    Thanks in advance.
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    mac
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    Re: first fire and deviations. HELP!!

    Post by mac on Sun Apr 29, 2012 1:18 pm

    Firdi,

    There are a couple of things that come to my mind.

    First....Are you sure that you are drawing the string back evenly? Put a mark on the string and , make sure that the mark ends up between the fingers of the nut. If the string is not centered, the bolts will leave the bow crooked, and will tend to veer off in the direction they are pointed.

    Second... Make sure that the limbs of the bow are level when you shoot. If the bow is tipped to the left, the bolts will go to the left.

    Mac
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    ferdinand
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    Re: first fire and deviations. HELP!!

    Post by ferdinand on Mon Apr 30, 2012 3:00 am

    Thanks Mac!
    I'll have a try at what u said.
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    stoneagebowyer
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    Re: first fire and deviations. HELP!!

    Post by stoneagebowyer on Mon Apr 30, 2012 9:54 am

    Also, make sure your quarrel groove or rest is centered.
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    Geezer
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    Re: first fire and deviations. HELP!!

    Post by Geezer on Mon Apr 30, 2012 12:29 pm

    All those are good possibilities, but in my experience... making and selling hundreds of crossbows, the most common fault for right-handed shooters lies in rocking the bow to the left to get the eye in line with the groove... it's a bit challenging with a straight stock. I always have the customer check that he's holding the bow absolutely level before anything else.
    Geezer/
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    stoneagebowyer
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    Re: first fire and deviations. HELP!!

    Post by stoneagebowyer on Mon Apr 30, 2012 1:15 pm

    David Watson knows what he is talking about.

    I would highly suggest that when you start shooting a new bow, use a bench rest to eliminate that variable. Just a folding table with a few sandbags to rest the crossbow stock on would do the trick, if you don't have access to a formal shooting range. Sighting in is much easier that way.

    Dane
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    ferdinand
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    Re: first fire and deviations. HELP!!

    Post by ferdinand on Mon Apr 30, 2012 9:20 pm

    Thanks for all the advice!
    I had a litlle weapons training and Geezers remarks sound really plausible!
    Measuring the prod vs stock i found a flaw, the prod seems to point to the right instead of being at a 90' angle if u look at it from above.
    Anyone follow me? (just a dutch guy trying his best).
    Its like a crooked cross(just slightly)
    And also it tilts to the left looking down the stock.
    The way my prod is mounted is no standerd way so i must do some thinking how to permanently fix my problems.
    Anny suggestions are always welcome.
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    stoneagebowyer
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    Re: first fire and deviations. HELP!!

    Post by stoneagebowyer on Tue May 01, 2012 5:41 am

    Your English is great, so don't feel bad. Based on your using the stirrup as part of how you lock the prod into the stock, maybe remove the bow and prod, use files or raps to true up the prod socket hole so the prod is 90 degrees as you look down, then use slim wedges or shims made out of hardwood or thin metal, and bolt the stirrup back into place? Others may have ideas to fix the problem.
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    ferdinand
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    Re: first fire and deviations. HELP!!

    Post by ferdinand on Tue May 01, 2012 11:36 am

    Great advice.
    Although i have one problem, the stirrup is rivetted so cant take it off easy.
    But the wedges are great idea.
    I was looking for that word "wedge". I thought the word whas "key".
    Anyhow, here is a picture of one of the two i forged.
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    ferdinand
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    Re: first fire and deviations. HELP!!

    Post by ferdinand on Tue May 01, 2012 11:45 am

    This is how i put them in, one each side to be able to adjust.
    No time to fire it, couple of nightshifts now.
    I'll get back to you guys on how it worked out.
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    ferdinand
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    Re: first fire and deviations. HELP!!

    Post by ferdinand on Tue May 01, 2012 11:49 am

    Extra advantage, the prod is higher now wich is good because the string whas resting kind off heavy on the stock.
    Lesser friction means better shot right?!
    Testing in couple of days.
    Thanks alot guys!

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