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Thread: Barrel gripping block

  1. #1
    Join Date
    Dec 2006
    Location
    Branchville, NJ
    Posts
    509

    Barrel gripping block

    What is the opinion on barrel block design? Round or V-block? Aluminum block directly on steel barrel? Paper, plastic, or rubber between steel and aluminum? Bed with Marine-Tex or similar? This will have to work with miltiple barrels for ammo development.

  2. #2
    Join Date
    Sep 2005
    Location
    Sheridan WY
    Posts
    180
    My Powell has a V-block design. I cut three long, narrow strips of that 10-mil PVC tape to serve as a buffer between the barrel and the block at teh three points of contact. This has worked very well for several different barrels that varied from 1.450 down to 1.350 and even a bit smaller.

    Rod

  3. #3
    Join Date
    Dec 2006
    Location
    Branchville, NJ
    Posts
    509
    I have noticed in the pictures section, that some of the V-block designs are a V-block on bottom and a flat plate for a 3-point contact, and others are a double V-block for a four point contact. Any preferences? This will be for 1.500" dia. barrels in .338 Lapua Mag and .300 Win Mag.

  4. #4
    Join Date
    Aug 2008
    Posts
    41
    Wait a minute. We talking about putting a magnum round in a rail?

  5. #5
    Join Date
    Dec 2006
    Location
    Branchville, NJ
    Posts
    509
    Yes. We are working on sniper ammo and need to have an accurate setup to test from. Probably going to have to use Thompson Bearings to keep it together.

  6. #6
    Join Date
    Oct 2015
    Location
    Bristol, Connecticut
    Posts
    43
    WOW, now I have a question. That a powerful round, how will you keep the rail from flying off? I was under the impression that the weight held it down.

    "Bill Gruby"

  7. #7
    Join Date
    Dec 2006
    Location
    Branchville, NJ
    Posts
    509
    That is why we will use the Thompson Bearing Rails.

  8. #8
    Join Date
    Oct 2015
    Location
    Bristol, Connecticut
    Posts
    43
    Linear Bearing Rails, that's cool.

    "Bill Gruby"

  9. #9
    Join Date
    Aug 2008
    Posts
    41
    Quote Originally Posted by Bill Gruby View Post
    WOW, now I have a question. That a powerful round, how will you keep the rail from flying off? I was under the impression that the weight held it down.

    "Bill Gruby"
    That was my concern. If you put a magnum chambered barrel on my "Young" ,you're gonna have the cradle in your lap every time you set it off.

  10. #10
    Join Date
    Oct 2015
    Location
    Bristol, Connecticut
    Posts
    43
    Another question. Windage is adjusted at the rear and pivots at the front. Elevation is adjusted at the front and pivots at the rear of the Rail Guns. Either the bearing or the rail must be locked. How are you going to incorporate this? Or did I miss something. Curiosity killed the cat but this really grabbed my attention.

    "Bill Gruby"

  11. #11
    Join Date
    Dec 2006
    Location
    Branchville, NJ
    Posts
    509
    We use a Frank Mann designed "Bond Mount" for testing. Windage and elevation are built into it. The different test mounts then attach to it. This is a setup we did to catch the bullet as it left the case on High Speed video. This is useing the old V-Block accuracy setup on the Bond mount. We will make a Thompson Rail fixture to attach to the mount.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  12. #12
    Join Date
    Oct 2015
    Location
    Bristol, Connecticut
    Posts
    43
    Thank you for the pictures. It is easily seen now how you could incorporate the Linear Bearing Rail. That is quite a set up you gents have.

    "Bill Gruby"

  13. #13
    Join Date
    Dec 2006
    Location
    Branchville, NJ
    Posts
    509
    We have two 100 meter and one 300 meter tunnels. We are constantly trying to improve our test procedures.

  14. #14
    Join Date
    Jul 2011
    Location
    Phoenix Az
    Posts
    140
    Why don't you build an extended plate on the sides of the upper and sand bag them,or counter-weigh them ? Those MASSIVE springs may be effecting accuracy.
    The Barrel blocks on our rails are about 6" long and most,,not all,, are torqued to specific settings. That short block may be Choking the barrel.
    Are you taking the lash / harmonics into consideration ? a 1.500 will shoot differently than a .750

    I M O which is reinforced by better rail shooters than I am,, 3 point is the way to go on Powell based design ( Aluminum to steel), however a mylar sleeve works well on a Young design ( Round) . NO BEDDING Compounds,,,, You're in UNCHARTED TERRITORY

    Pretty rare that my rail will like the same load that my bag guns like. Just saying.
    Last edited by classcat; 10-23-2015 at 10:19 PM.

  15. #15
    Join Date
    Oct 2003
    Location
    Malvern, Arkansas
    Posts
    2,763
    First off whats the accuracy standards youre hoping for? If youre hoping for 3/4moa anything will work. If youre trying to prove better i dont think the linear bearings are gonna cut it. You could make an underslung rail and make the slides extremely long. You can have it hit a long spring plunger after 1/2-2" travel then slow down over a couple feet. Of course in a tunnel youll have time to let the wake turbulance settle and realign the scope each time

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