+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 11 to 18 of 18

Thread: Head spacing with only a FIELD gauge.

Click here to increase the font size Click here to reduce the font size
  1. #11
    Advisory Panel
    USGI's Avatar
    Join Date
    Mar 2009
    Last On
    @
    Location
    Oregon, USA
    Age
    78
    Posts
    2,187
    Real Name
    Bob
    Local Date
    03-28-2024
    Local Time
    01:35 PM
    Quote Originally Posted by tenOC View Post
    They're actually stamped 1.290, 1.296 and 1.299.
    Mine are the same, I should have checked before posting - they weren't buried as deep in my Carbine "stuff" as I thought they were! - Bob

  2. # ADS
    Friends and Sponsors
    Join Date
    October 2006
    Location
    Milsurps.Com
    Age
    2010
    Posts
    All Threads
    A Collector's View - The SMLE Short Magazine Lee Enfield 1903-1989. It is 300 8.5x11 inch pages with 1,000+ photo’s, most in color, and each book is serial-numbered.  Covering the SMLE from 1903 to the end of production in India in 1989 it looks at how each model differs and manufacturer differences from a collecting point of view along with the major accessories that could be attached to the rifle. For the record this is not a moneymaker, I hope just to break even, eventually, at $80/book plus shipping.  In the USA shipping is $5.00 for media mail.  I will accept PayPal, Zelle, MO and good old checks (and cash if you want to stop by for a tour!).  CLICK BANNER to send me a PM for International pricing and shipping. Manufacturer of various vintage rifle scopes for the 1903 such as our M73G4 (reproduction of the Weaver 330C) and Malcolm 8X Gen II (Unertl reproduction). Several of our scopes are used in the CMP Vintage Sniper competition on top of 1903 rifles. Brian Dick ... BDL Ltd. - Specializing in British and Commonwealth weapons Specializing in premium ammunition and reloading components. Your source for the finest in High Power Competition Gear. Here at T-bones Shipwrighting we specialise in vintage service rifle: re-barrelling, bedding, repairs, modifications and accurizing. We also provide importation services for firearms, parts and weapons, for both private or commercial businesses.
     

  3. #12
    Advisory Panel
    painter777's Avatar
    Join Date
    Mar 2009
    Last On
    @
    Location
    Central Michigan
    Posts
    5,312
    Local Date
    03-28-2024
    Local Time
    04:35 PM
    Quote Originally Posted by Sunray View Post
    Headspace gauges do not 'measure' anything. They only tell you if the thing is within tolerance or not.


    A Head Space Guage is used for measurement.

    1.290"
    1.295"
    1.300"
    Above are the USGI examples I used from TM9-1276_1947
    Head space is MEASURED with a set of GO,NO-GO and FIELD guages.

    Maybe a definition of Head Space (In Firearms) may be required here:

    Head Space is the distance measured from the part of the chamber that stops forward motion of the cartridge (the datum reference) to the face of the bolt.

    These Head Space Guages were required by US armorers to be sent yearly in to a Arsenal to be Inspected. Above from TM9-1276_1947 page 18, in section 15 part 4 under Note.
    Must have been for Inspection and Calibration of Length and Diameter.

    You still think they were used for 'Close Enough' type calculations. Like your only a 1/3 of a quart of oil low ?
    Charlie-Painter777

    A Country Has No Greater Responsibility Than To Care For Those Who Served...

  4. The Following 2 Members Say Thank You to painter777 For This Useful Post:


  5. Avoid Ads - Become a Contributing Member - Click HERE
  6. #13
    Advisory Panel Patrick Chadwick's Avatar
    Join Date
    Sep 2008
    Last On
    06-25-2023 @ 06:36 AM
    Location
    Germany
    Posts
    5,032
    Local Date
    03-28-2024
    Local Time
    10:35 PM

    Basic measurement caution

    Quote Originally Posted by tenOC View Post
    So....there ya go. China is always right, aren't they?
    This is an oldie:

    The fact that an instrument has a resolution of 0.001" does NOT mean that it is accurate to 0.001".

    The slightest bit of grease or dust on the faces of a gauge will affect the reading. As will the temperature. Or the slightest skew of the object being measured. If you are really concerned about accuracy, then you need a reference bar. In high-quality micrometer cases there used to be an hook spanner and a 1" reference bar for adjustment. I am lucky enough to possess a cased 2" bench micrometer that reads to 0.0001". The reference bars have plastic grips for a very good reason - with the bench micrometer you start to detect the difference between a "cold" measurement - i.e. out of the cupboard - and "hot" - i.e. after you have held the object in your hands for a while.

    So while your digital gauge may be readable to a resolution of .001", do not trust it blindly. At best it is indicating that a measurement of, say, 1.296" is closer to 1.296" than 1.295" or 1.297" provided that all parts are spotlessly clean and at the same moderate temperature.
    Last edited by Patrick Chadwick; 10-11-2019 at 04:40 AM.

  7. #14
    Legacy Member tenOC's Avatar
    Join Date
    Mar 2011
    Last On
    10-27-2021 @ 05:38 PM
    Location
    Earth, Milky Way. And as seen in another dimension.
    Posts
    638
    Local Date
    03-28-2024
    Local Time
    04:35 PM
    Thread Starter
    Yeah. Thanks for teaching me about grease and skewing an object.

  8. #15
    Advisory Panel
    painter777's Avatar
    Join Date
    Mar 2009
    Last On
    @
    Location
    Central Michigan
    Posts
    5,312
    Local Date
    03-28-2024
    Local Time
    04:35 PM
    Quote Originally Posted by tenOC View Post
    I have one that closes easily on the NO-GO. But doesn't on the FIELD.
    From a Brownells how to:

    On older military rifles:
    An old military surplus rifle like a Mauser, Mosin Nagant, '03 Springfield, Enfield, Arisakaicon, and others may close on a NO-GO gauge. If it does, check it with a FIELD gauge. A FIELD gauge measures the absolute maximum allowable, safe headspace. If the bolt does not close on a FIELD gauge, and the gun is in good condition, it is generally safe to shoot.

    To add:
    However, the strength of these old guns can vary a lot depending on when and where they were manufactured. Headspace is not the only factor in deciding whether one of these guns - or any gun for that matter - is safe to shoot. When in doubt, take it to a qualified gunsmith to have it checked out.

    Link:
    https://www.brownells.com/guntech/he....htm?lid=17125

    Best to have a real clean chamber, dry with no oil or solvents.

    Charlie-Painter777

    A Country Has No Greater Responsibility Than To Care For Those Who Served...

  9. The Following 2 Members Say Thank You to painter777 For This Useful Post:


  10. #16
    Legacy Member tenOC's Avatar
    Join Date
    Mar 2011
    Last On
    10-27-2021 @ 05:38 PM
    Location
    Earth, Milky Way. And as seen in another dimension.
    Posts
    638
    Local Date
    03-28-2024
    Local Time
    04:35 PM
    Thread Starter
    I feel a lot better reading about the 1.302 value being the lowered bar.

  11. #17
    Legacy Member Al Diehl's Avatar
    Join Date
    Feb 2008
    Last On
    06-11-2022 @ 10:52 AM
    Location
    Leesville/Ft Polk Louisiana, USA
    Age
    64
    Posts
    211
    Real Name
    AL
    Local Date
    03-28-2024
    Local Time
    02:35 PM
    Here at work we do services on military rifles (M4A1s) and MGs (M249s and M240s) week in and week out. We only use the "Field" gage.

    When I am at home, I use both the Go and No-Go gages. If it fails No-Go I don't see any reason to take a chance on shooting it.

    Al
    Last edited by Al Diehl; 10-28-2019 at 01:26 PM.
    “Any society that would give up a little liberty to gain a little security will deserve neither and lose both.”- Benjamin Franklin

  12. Thank You to Al Diehl For This Useful Post:


  13. #18
    Legacy Member Bubba-7's Avatar
    Join Date
    Mar 2009
    Last On
    08-27-2023 @ 08:25 PM
    Location
    Just North of Fort Benning
    Posts
    503
    Real Name
    Roger
    Local Date
    03-28-2024
    Local Time
    04:35 PM
    TM 9-1276 February 1953, page 14
    1.290
    1.295
    1.298
    1.302
    Page 37 for usage of each gauge.
    Last edited by Bubba-7; 11-19-2019 at 10:32 PM.

  14. Thank You to Bubba-7 For This Useful Post:


+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

Similar Threads

  1. EY Enfield No 1 mk III only slight resistance on field gauge
    By Ben Cartwright in forum The Lee Enfield Knowledge Library Collectors Forum
    Replies: 18
    Last Post: 01-16-2016, 05:15 PM
  2. .074 Field Gauge from Clymer
    By Ben Cartwright in forum The Lee Enfield Knowledge Library Collectors Forum
    Replies: 5
    Last Post: 09-19-2014, 09:01 AM
  3. Head Spacing (video mini lesson) - AGI Gunsmiths
    By Badger in forum Gunsmithing for Old Milsurps
    Replies: 3
    Last Post: 01-11-2014, 11:39 AM
  4. head spacing....
    By ave8er in forum M1903/1903A3/A4 Springfield Rifle
    Replies: 13
    Last Post: 07-19-2011, 05:55 PM
  5. Field Gauge for 30-06
    By SSgt's Son in forum Gunsmithing for Old Milsurps
    Replies: 3
    Last Post: 10-07-2009, 12:02 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Raven Rocks