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  1. #1
    Join Date
    May 2006
    Posts
    260

    unlimited builds

    i see that a lot of guns use a barrel clamp that has bolts to hold the clamp on the barrel.i thought that this clamping type put a strain on the barrel and made it shoot bad groups.i was going buy a article by sinclare that he states a compression is put on the inside of the barrel that is not good for small groups.
    gary b

  2. #2
    Join Date
    Dec 2009
    Location
    Nampa, Idaho
    Posts
    501
    The majority of rail guns today utilize a v block or a round channel with a Delrin sleeve. The Delrin helps to isolate any resonant vibrations created in a traditional metal to metal fit, commonly seen in the v block. I have seen several methods for utilizing Delrin, solid Delrin sleeve, split Delrin sleeve and a 3 piece Delrin sleeve spaced evenly in the block. The guys using these Delrin sleeves rail guns shoot extremely well. As far as fastening the v block there are typically 8-10 bolts that are torqued down and while conventional wisdom would leave one to believe that torquing imparts a strains equally across the barrel, with a 1.350 diameter barrel I don't think that occurs.

  3. #3
    Join Date
    Feb 2003
    Location
    Houston, Texas
    Posts
    7,758
    At the Nationals, I saw Rail Guns with some type of non metallic sleeve isolating the barrel shoot vey well, and some with just a standard V-Block, shoot very well.

    I also saw Rail Guns with some type of non metallic sleeve isolating the barrel shoot poorly, and I also saw some with just a standard V-Block shoot poorly.

    This I know or a fact. Whether you are using a Sleeve, , or just a V-Block, you CAN close the ID of a barrel with too much torque on the bolts.

    I proved this to myself by taking a barrel blank and finding the deltronic Pin that would just slip in, and then seeing at what point I could tighten the ten 5/16 clamping bolts so that it would no longer slip in.

    It makes no difference whether you have a non metallic sleeve isolating the barrel, or a V-Block. At some point just north of 100 inch pounds of torque, the ID of the 1.450 diameter barrel collapsed enough to where you could physically measure the closure with Deltronic Pins.

    Will this affect the accuracy potential of the barrel. I have proven to myself, at the range, that the answer is yes.

    I torque mine to about 50 inch pounds.
    Last edited by jackie schmidt; 10-30-2016 at 11:13 AM.

  4. #4
    Join Date
    Feb 2004
    Location
    Williamson County, Texas
    Posts
    292
    Jackie,

    Interesting and valuable information.

    In your experiment, did the collapsed barrel spring back when torque was released? Or was the deformation permanent?

    Nez

  5. #5
    Join Date
    Feb 2003
    Location
    Houston, Texas
    Posts
    7,758
    Quote Originally Posted by NezRongero View Post
    Jackie,

    Interesting and valuable information.

    In your experiment, did the collapsed barrel spring back when torque was released? Or was the deformation permanent?

    Nez
    When I released the tightness of the bolts, the Deltronic Pin would slip in as before.

    Since I have Deltronic Pins in .0001 increments, I could probably do a video showing this. I have the 4 inch long piece of 1.450 unlimited barrel.

  6. #6
    Join Date
    May 2006
    Posts
    260

    barrel sleeves

    so i gather as long as the bolts are tightened a specifice amount you are safe.
    what do others torque the barrels at andhow is this done.
    gary b
    I see in some 1000 yard guns they glue the barrel in a sleeve.but I like the idea that I can unclamp the barrel and switch out the barrel or the barreled action buy unbolting the clamps.

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