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    New guy needs help!!!!

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    TDHorton
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 11
    Join date : 2010-08-18
    Age : 71
    Location : Salida, CO

    New guy needs help!!!!

    Post by TDHorton on Fri Nov 05, 2010 2:36 pm

    This is my first effort. I'm also old and stupid (use to be young and smart. Don't know what happened!!!), so, I don't remember. But I think I read here or elsewhere that I cut a groove in the stock from the prod to the roller nut. Question: How wide and how deep? I'm using Jim's (Alchem Inc) plans for the tiller from prod to roller and then a more conventional rifle stock on back. The bolts are 11/32". Thanks for the help!!!
    Terry
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    Pavise
    Dear Friend, You will be Greatly Missed.
    Dear Friend, You will be Greatly Missed.

    Posts : 128
    Join date : 2010-02-07

    Re: New guy needs help!!!!

    Post by Pavise on Fri Nov 05, 2010 5:20 pm

    Hi Terry,

    Your particular string should touch the bolt just a tad above it's centre. If you take one of your 11/64" shafts and lay against the flat end of it, something (a round gauge) of a similar diameter as your string is at the center serving, you will see how much is left for your groove. This groove can be rounded or cut in a vee shape and above all, dead straight and at 90 degrees to your prodd mounting. In fact the groove can be a little deeper and the bolt will then ride on the two edges alone which will provide less friction. The choice is yours; but the string to bolt reference is important if you want your crossbow to be accurate. I would experiment doing this on some scrap wood before committing to the final product. Cut this test groove a little deeper with each pass of your tool and test the ideal depth with your gauge to establish how deep and wide to make it.
    A "slot" has to made the same width to provide the ideal contact point as described above but if using three fletch instead of the medieval two fletch then this slot has to be deep enough to allow free passage of the cock feather riding in the slot.

    Pavise
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    TDHorton
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 11
    Join date : 2010-08-18
    Age : 71
    Location : Salida, CO

    Re: New guy needs help!!!!

    Post by TDHorton on Fri Nov 05, 2010 6:03 pm

    Thanks for the help! I was with you until the "slot". I'm using 3 fletch bolts, so please try again on the explaination. I'm one of those "picture is worth a thousand words" kinda guys. Got any? Thanks again!
    Terry
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    Pavise
    Dear Friend, You will be Greatly Missed.
    Dear Friend, You will be Greatly Missed.

    Posts : 128
    Join date : 2010-02-07

    Re: New guy needs help!!!!

    Post by Pavise on Fri Nov 05, 2010 7:52 pm

    Okay Terry, here goes. I suggest you Google The Crossbowmens Den and then go to Hints and Tips on the late Robin Allen's 'site and then to Track Dimensions. There you will find some reliable tables for making the width of your track in relation to your particular shaft and string sizes. Other than that, I think you will find that a slot 5/16" wide by 3/4" deep will serve your needs. Again I suggest that you test everything first on some scrap wood of the same width as your stock. I make my track slots by putting a 1/8" wide x 7/8" deep slot cutter bit in my table mounted router set to cut 3/4" deep and then make one pass down the approximate middle of my stock. Then I turn the stock over and make another pass which evens each side exactly. Then I adjust the router bit height setting a little bit at a time until I have my desired slot width exactly down the middle of my crossbow deck. This is why it is fundamentally important to leave the sides of one's stock blank flat and even on both sides before doing any other shaping. The foundation of an accurate crossbow starts and finishes with an accurate track slot.

    Please note: If your fletch is less high then your slot can be less deep. But then you might restrict yourself to that fletching size only or less!

    Pavise

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