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Thread: Chamber Run Out - may be of interest to some

  1. #1
    Distinguished Member Ronin's Avatar
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    Chamber Run Out - may be of interest to some

    Im in the process of doing a complete refurbishment of a Sako AV for a customer.


    Im also doing a bit off "back to basics" machining using my 4 jaw chuck instead of the 6 Jaw Bison, as thats being stripped down and totally cleaned today.


    I clocked up the new barrel for the AV and chambered it using one of three chamber reamer holders I have - this time I chose my Gre Tan holder as the barrel (a chromoly Lothar Walther) was showing zero run out despite being a rather light (Standard Sako) profile - its real easy to distort the lighter profile barrels when clocking them up.




    I check for concentricity at every step - create tenon; check, create thread; check, create bolt nose recess (if applicable); check and so forth right up to the chambering phase.


    Anyway, once id chambered the barrel to headspace plus .003" I checked the rearmost edge of the chamber for run out.


    Dial gauge is an Interrapid in 1/10000 increments (one ten thousanth of inch)


    The tenon and chamber are still wet through from the flush system I use which is why its so messy….




    I usually recon on getting 2- 3 tenths run out on most chambers and as close to zero on target or tactical rifle chambers - I'm more than happy with this one….




    http://i20.photobucket.com/albums/b246/Redmist1/th_IMG_2414_zpslzgkhr0n.mp4

  2. #2
    Lovely,
    pity you are over the water from us.
    edi

  3. #3

  4. #4
    Distinguished Member Ronin's Avatar
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    Thats how I do it usually - or try to.


    Pity your over there Edi !

  5. #5
    Andy will you make it to the IWA this year?
    edi

  6. #6
    Redmist, dont you mean "ovality" or "out of roundness"


    Ian.

  7. #7
    Distinguished Member Ronin's Avatar
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    Ovality - yes, I guess it could be called that

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