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    Steel prod - unknown draw weight

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    Cornerstone
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    Steel prod - unknown draw weight Empty Steel prod - unknown draw weight

    Post by Cornerstone on Sat May 18, 2019 5:19 am

    So, last summer a friend of mine was kind enough to give me an old crossbow steel prod. He got it about 8 years ago by the maker (not knon by name) and passed it onto me since he knows my affection for crossbows. I've been really eager to start building with it, but there's a problem - both draw weight and length is unknown...
    So, my questions is if anyone has any tips on how to figure the numbers out without risking breaking the bow and risking injury?
    It's not a monster of a bow lookwise, but if I bend it over my knee with all my strength it only bends about 1-2 mm. The bow is supposedly x-rayed and should be entirely free of cracks.
    Here are some measurments:
    Length tip to tip - 78 cm
    Width at center - 2,2 cm
    Width at tips: 1,2 cm
    Thickness at center: 1 cm
    Thickness at tips: 0,5 cm

    Other clues are two numbers stamped into the top of the bow at the very center that says 1   33 with a dot in between to mark the center.
    So, what am I dealing with here? Grant me your wisdom! 
    Steel prod - unknown draw weight 20190510
    Steel prod - unknown draw weight 20190511
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    Steel prod - unknown draw weight Empty Re: Steel prod - unknown draw weight

    Post by Rizzar on Mon May 20, 2019 10:49 am

    Hey.


    The point is the supposed center of the prod.
    The numbers are a production number (#133) and do not give a hint to data.

    If you know the prodsmith (this one is clearly not made by a beginner), you could get in contact to him and ask him.

    Is there no forging mark on the bow???

    Coincidence:
    got some bows here that are marked the same way.
    is it possible your friend got the bow in or near germany???

    ahh, i have the feeling the prod is made by jens sensfelder.
    Style, detail and time seems right for around 8 years ago, since i have numbers around 200 made 2014, could be he got his forging mark later on.

    If i give it a guess it is supposed to work for a bullet shooting crossbow but does not neccessarily apply.

    Greetings
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    Steel prod - unknown draw weight Empty Re: Steel prod - unknown draw weight

    Post by Cornerstone on Mon May 20, 2019 1:18 pm

    Thank you for your answer! 
    Found a small stamp on it, could you perhaps identify it? 
    Steel prod - unknown draw weight 20190512
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    Rizzar
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    Steel prod - unknown draw weight Empty Re: Steel prod - unknown draw weight

    Post by Rizzar on Mon May 20, 2019 10:37 pm

    You are lucky, since this is a pure coincidence

    As I thought it is in fact the forging mark of jens sensfelder.
    Steel prod - unknown draw weight 110

    He is a good guy and I know he provides his prods with safety hints and data to work with.

    ask him if he can provide you with the data for the prod, he must have some type of chart for his works.

    good luck and inform us here if you are successful
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    Steel prod - unknown draw weight Empty Re: Steel prod - unknown draw weight

    Post by Cornerstone on Sat May 25, 2019 3:07 am

    I managed to get in contact with Jens, thank you so much Rizzar! 
    The bow was made in the autumn of 2011 and has these specifications: 

    String length total 770 mm
    Bracing 65 mm
    Centre Cross section 22x11 mm
    Outer Cross section 13x5 mm
    Weight 872 g

    At a bracing of ca. 70 mm and a drawing distance of 180 mm (Distance bow - lock), the bow has a draw weight of ca. 115 kg.

    Off to the drawing board! Very Happy 

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