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Taping a Go-Guage to get a no go gauge.

Discussion in 'Gunsmithing and Repairs' started by D51208, Feb 22, 2012.

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  1. D51208

    D51208 Member

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    RCMODEL posted on one of my other threads about applying tape to a go gauge to get a no go gauge.

    RC or anyone else who knows how, where do you apply the tape on the go gauge? How thick should the total tape be? Also how thick should the head space gauge now be when it has the tape on it?

    could you post a picture please?

    Thanks for the help!
     
  2. fguffey

    fguffey Member

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    If it is possible to tape a go-gage it is possible to tape a case, if you were able to measure the length of the case from the head of the case to it's shoulder you would not need the head space gage.

    If I was going to add to the length of the gage I would add the tape to the part of the gage that goes against bolt face, adding to the shoulder of the gage gets very complicated when working with the cone and apex.

    F. Guffey
     
  3. fguffey

    fguffey Member

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    forgive, as to the last part, the difference between go-gage and no go-gage length is different for different chambers, I make gages in different length, some times in thousands.

    There is .004 thousands difference in length between the 30/06 go-gage and the no go-gage.

    It would help if you listed the chamber.

    F. Guffey

    this early? I do not use spell check.
     
  4. D51208

    D51208 Member

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    I'm not to worried about spelling haha. The chamber is for an ar-15 chambered in 5.56.
     
  5. rooster59

    rooster59 Member

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    Like fguffey said, "There is .004 thousands difference in length between the 30/06 go-gage and the no go-gage."

    Thin beer can metal will be close to .004in . Find the thinnest (cheapest) can you can. Check with a Mic.
    Put the shim between the boltface and the go gauge. It looks like the difference in a 223 go / no-go is 0.003in.
     
  6. rcmodel

    rcmodel Member in memoriam

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    As I posted before, Scotch "Magic" tape is .0015" thick, or close enough.

    Two layers on the rim of the GO gage, and trimmed around the "case gage rim" edge with an xacto knife so it doesn't hang over the edge, is .003".

    Three layers is .0045" and should be NO GO in a .223.

    But tape is tape.
    You can't muscle it trying to close the bolt on it or it will squish it.

    As rooster59 said, measure some beer or pop can aluminum, or you can get brass or steel shim stock in about any thickness at any good auto repair store.


    rc
     
  7. Fleet

    Fleet Member

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    Better yet, spring for a no go gauge, then you won't have to worry about it.
     
  8. Old Dog Man

    Old Dog Man Member

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    Chamber guages

    Buy yourself a field guage for the AR the standard go-nogo guages are not for AR type rifles. Al
     
  9. fguffey

    fguffey Member

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    Or learn to determine the length of the chamber without a head space gage, I do not shoot gages, and I do not fire form, I form first, then fire.


    F. Guffey
     
  10. bobsmith

    bobsmith Member

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    Fguffey, I looked at my Forster .30-06 headspace gages and the difference between go and no go is .006"
     
  11. D51208

    D51208 Member

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    How do I go about checking head space without gauges?


    Just a field gauge?
     
  12. MtnCreek

    MtnCreek Member

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    I assume the barrel came w/ the extension installed, correct? If so, I would shoot it and check the fired brass with a case guage. You're not setting headspace; you're checking it, correct?

    Edit: I will add, this is not the proper way to do it, it's just the way most folks do it.

    Edit, Edit: We are talking about a AR rifle?
     
  13. D51208

    D51208 Member

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    Yep, it comes with the extension and yep we are talking about an ar-15.

    Yep just checking it to make sure there is no catastrophic malfunctions and that there wont be any.
     
  14. MtnCreek

    MtnCreek Member

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    A smith can check it for less cost than buying gauges and assuming you have a good smith, you'll know it's right.

    I just shoot it and check the fired case in a case gauge (if you reload, you probably have one). I think most people just shoot it and stop at that. I can't tell you this is the correct way to go, so you'll have to make your own mind up on that. FWIW, my smith told me he has yet to run across a new Barrel/Extension/Bolt that didn't check. If you are re-barreling an old rifle, I would swap out the bolt for a new one.
     
  15. MtnCreek

    MtnCreek Member

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    Extension was factory installed on the barrel, right?

    Edit: And if you haven't already, don't waste your money on a Go gauge for an AR.
     
  16. D51208

    D51208 Member

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    Yeah the extension was factory installed. I haven't wasted my money quite yet.
     
  17. TTF

    TTF Member

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    Apply the tape to the back of the go gage. One layer of taper will get you to 1/2 the distance to the no go gage....so still acceptable for headspace (for me this is more accurate anyway), and 2 layers of scotch tape will get you to where you need for a no go gage.
     
  18. Old Dog Man

    Old Dog Man Member

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    Taping headspace guages

    DON'T DO IT PERIOD, if you have to do something like this use metal shims they come in different thicknesses and can be cut with sissors in round shape to fit in bolt face.You can get them at auto parts stores or places that sell bearings, they are easy to make and will not rool-up when bolt face is turning to lock-up, put a little oil on the bolt face to hold them in place, also remove the ejector plunger to get a better reading. Head space guage dimensions for .223 are as follows ( GO=1.4636" ) ( NO-GO=1.4666) (Field=1.4696) . The FIELD GUAGE is ( .003" LONGER THAN NO-GO ) and is recommended for AR's because they need the extra space to function. Buy yourself a field guage for your AR and go shoot. Al
     
  19. Elkins45

    Elkins45 Member

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    For CHECKING a rifle what you really need is a field gauge, correct? As long os the bolt won't close on a field gauge then you don't have an unsafe headspace condition.

    A go gauge is most useful when setting headspace, especially on a Savage-type rifle where you can just screw the barrel down against the gauge and that sets it for minimum headspace. For fitting prefit barrels on a Mauser where you need to use a reamer I would like to also have a no-go just to make sure I didn't go too far.
     
  20. Old Dog Man

    Old Dog Man Member

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    AR headspacing

    What is recommended for AR's is to use a field guage. The bolt should close on the field guage, as shown in the DVD that is sold by Brownell's and that is what I've used and the AR's it worked fine. The bolt action guns work with go and no-go guages, however I final fit mine with loaded rounds to get a tighter headspace, about .0015" is what I like. Al
     
  21. MtnCreek

    MtnCreek Member

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    Is that right or a mis-print?
     
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