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Ordnance spline block

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  • Ordnance spline block

    How was the 30 cal ordnance spline block used and what was the purpose?

  • #2
    Hum, do you have a picture of it????I'm not sure what you are asking about

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    • #3
      My guess is a barreled receiver was placed on a machined flat and this was used to check spline timing?

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      • #4
        Damn!!! I've been looking for one of those for a while. The one I have has a replacement spline on it, and while it works it's not very attractive looking.

        Yes, it's used to check the timing / index of a barreled receiver. It's supposed to be used with a precision-ground flat of granite block. Damn nice find there!
        Welcome to the Addiction!

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        • #5
          Neato,I've never seen such an animal!

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          • #6
            I have one of those in my 'tools' box. Never used it as the boys in the Navy trailer at Perry showed me how to check a barrel installation with cleaning rods..... one thru the rear sight, one thru the front sight, when they line up the barrel is in straight.

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            • #7
              Where can you find one like that?

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              • #8
                I think Columbus machine makes them. Look at their website. Every once in a while, they show up on E Bay and cmp forums.

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                • #9
                  I have used both the US GI barreling machine and the spline block. I prefer the barreling machine. But not having access to a barreling machine anymore I like the idea of trying the cleaning rod method. Does anyone offer a spline block for the M14?

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                  • #10
                    My version ,little different but works on same principle .In use on surface plate



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                    • #11
                      Thank You for the photos

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                      • #12
                        Heres my hillbilly version.
                        .


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                        • #13
                          I purchased a large group of documents that belonged to an ordnance officer (notes, proofs documents, SNL's, base shop stuff, etc. who was assigned to Aberdeen during WW2 as an instructor. I found this blue print in his stuff as well as other schematics to make the tools for disassembly, etc..
                          Click image for larger version

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                          • #14
                            The barrel alignment gage is used to check alignment after the barrel is installed with the M1 barreling fixture or any other way. The index markings on the fixture are not entirely accurate, but the gage used on a surface plate will insure proper alignment.

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