Inside Micrometer or Other Tooling

Discussion in '1911 Gunsmithing' started by azpoolguy, Feb 18, 2019.

  1. azpoolguy

    azpoolguy Well-Known Member

    Jul 4, 2013
    As I try and progress my skill level and knowledge more and better tooling is a requirement.

    What is your preferred method of measuring the inside diameter of a barrel bushing or slide other then the back of a standard micrometer?
     
  2. Greg Derr

    Greg Derr Custom Pistolsmith Supporting Addict Sponsor

    658
    Oct 3, 2011
    Gage pins, you may also try the EGW slide gage for bushing fit.
     
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  3. BenchMonkey

    BenchMonkey Angry Infidel

    509
    Nov 28, 2018
    Late to class.....sorry, my 7 m/o ate my homework!
     
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  4. azpoolguy

    azpoolguy Well-Known Member

    Jul 4, 2013
  5. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    I have gauge pins from .011" to .5" in one thou increments, so I use micrometers when measuring larger things that require tenths accuracy. For measuring things to +/- a thou (most pistol measurements) my calipers are fine.

    My mentor taught me how to properly use calipers. It's a bit of an art though, and no two calipers are the same. When I get a new caliper I test it on various gauge blocks and pins until I can determine the proper tension for a accurate measurement. Worked for him. Works for me. YMMV. :)
     
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  6. azpoolguy

    azpoolguy Well-Known Member

    Jul 4, 2013
    I just ordered new Mitutoyo calipers. They should be here today. I also have gauge pins up to .25” but I need to order the next set to .5”.
     
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  7. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    Dial or digital? I have digital Starrett mics but for one reason on another I prefer a dial on my calipers. I have a US made Starett 6" dial caliper that goes everywhere I do in my shop. I'd be lost without it. :)
     
    Last edited: Feb 19, 2019
  8. azpoolguy

    azpoolguy Well-Known Member

    Jul 4, 2013
    Digital.
     
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  9. Babboonbobo

    Babboonbobo Avatar is back to my favorite things!

    Nov 18, 2014
    I too prefer dials on my calipers, I use carbide tipped Mitutoyo calipers
    94043505-F8FD-424D-96DD-A1FC4DF370C7.jpeg


    Also for up to 2” I have actual inside mics from Starret that measure in .0001”
    Two sets cover everything from .2”-1.2” and 1”-2” then gage pins up to .250 for smaller holes.
    FFE2B143-F977-47F6-8306-5318912DD672.jpeg
     
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  10. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    You have good taste. :)
     
  11. azpoolguy

    azpoolguy Well-Known Member

    Jul 4, 2013
    Yes he does.

    I was looking at the poor man version of the 700MA. 499980DA-D44E-4CE0-BD5F-9F11E13D3AEE.jpeg
     
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  12. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    That will work too! :)

    I'm not one to get the most expensive tools available, but I do want something that works well and repeats.

    So now that I'm retired and broke, I hope all of my tools outlast me! :D
     
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  13. ChuckC

    ChuckC Well-Known Member Supporting Addict

    Feb 2, 2016
    I’ve found eBay to be a good source for starrett tools. I think I got my depth gauge and a 120a for under $80.
    Checked both for accuracy when I received them and they’ve been great for me.
     
  14. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    I too purchased much of my tooling on eBay. There are a lot of fakes on there (especially Starrett and Mitu), so I am very careful with whom I do business.
     
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  15. pistolwretch

    pistolwretch Dremel jockey Supporting Addict

    Aug 26, 2011
    Gage pins over expensive micrometers.
    And you really don't need the entire sets over .500".
    .698" -.705" for slide ID's.
    .577" - .582" for bushing ID's.
    Individual pins are pretty inexpensive.
     
  16. Capthobo

    Capthobo NRA Endowment member Supporting Addict

    Nov 9, 2016
    Ball end telescoping spring loaded T guage allows for difernt depth measurements for consistency and contricity at front middle and full depth of any internal cylinder.
     
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  17. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    In my own defense, I do a lot more in my shop than pistols. No way I'm giving up my mics. :)
     
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  18. azpoolguy

    azpoolguy Well-Known Member

    Jul 4, 2013
    Thanks Chuck. I had not thought about buying individual sizes either.

    That seems like a good route for what I need to accomplish.
     
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  19. Babboonbobo

    Babboonbobo Avatar is back to my favorite things!

    Nov 18, 2014
    Exactly, I’m a journeyman tool and die maker and need these for my actual job! But having all these tools at my disposal really makes other things much nicer. Like measuring a bushing i.d.
     
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  20. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    Exactly! :)

    For example, when Greg mentioned that slide gauge, I thought "hey, I could make one of those!" At the same time I could make a bushing gauge as well. They'd be handy to keep on the handwork bench.
     
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