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  1. #16
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    Hi Bob,

    I've never had any real problem getting into a 14 or 15 mm bore ! The small ones are only about 12 mm fully closed.

    Somewhere I've got a design for a small bore measuring tool that will easily go into a 6 mm bore and provide repeatable measurements within a tenth of a thou. The only problem with the design is that you need another tool for each mm step in bore size, and accurate calibration rings. The beauty of the design is its ability to do very deep bores, easily a ten or fifteen to one or more ratio.

    Calibrated measuring pins are much easier to use for small bores.
    Best Regards:
    Baron J.

  2. #17
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by BaronJ View Post
    Hi Bob,

    I've never had any real problem getting into a 14 or 15 mm bore ! The small ones are only about 12 mm fully closed. .
    Sorry I should have been more specific, I was referring to digital/vernier callipers.

    I have various sizes of callipers like those shown in your photo and I do use them extensively for wood turning but for metal work I find the spring loaded inside gauges easier to use because being somewhat ham fisted I don't have to worry about getting the screw finger pressure just right.

  3. #18
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    Aug 2006
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    Melbourne
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    Using a dial bore gauge could be an option as well for getting into deep bores.

  4. #19
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    Hi Bob,

    Sorry about that, a bit of confusion on both sides.

    I've been looking for that paper describing the deep hole bore gauge I mentioned earlier ! I suspect that it is similar in design to those three finger bore gauges that you can buy from China for about £30. Similar to this

    FLAMEER Inner Diameter Dial Bore Gauge 18-35mm.png

    If I can find it I post it here.
    Best Regards:
    Baron J.

  5. #20
    Join Date
    Aug 2008
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    Quote Originally Posted by gazza2009au View Post
    I will have to see if there is a model for my use 17mm inside diameter, and i will need to find some info on how those inside measuring one's work
    AFAIK, those tubular inside mics only start at 50mm, anything less than that you either need telescope gauges, a dial bore gauge or a 3-point bore mic. Or a CMM, those are good too

  6. #21
    Join Date
    May 2011
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    Murray Bridge S Aust.
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    Quote Originally Posted by elanjacobs View Post
    Or a CMM, those are good too
    Not trying to be ignorant, but what's a CMM??? Please remember there are members on here that don't know what some of the abreviations represent. Me included!!!
    Kryn
    To grow old is mandatory, growing up is optional.

  7. #22
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    Aug 2008
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    Sorry...Co-ordinate Measuring Machine

    Not meaning to be rude, but everyone here does have access to the internet (ie practically the sum total of human knowledge) and they can look up stuff themselves sometimes...

    Yes, I know there's no nice way to say that, no offence is meant to anyone. I just feel like it's good to encourage people to do some of their own research instead of always "asking the teacher" so to speak.

  8. #23
    Join Date
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    ACT
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    couldn't help but reply to this.

    always good to spell out acronyms first. Just good writing practice to do so.

    Not intended to offend, just saving you from looking it up your self.

    Google comes up with many things for CMM.

  9. #24
    Join Date
    Sep 2012
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    Hi Bob, Guys,

    I finally found that paper that I mentioned about bore gauges. I've attached it to this post.

    4bidg.pdf

    Its a 1 meg PDF. with all the details.
    Best Regards:
    Baron J.

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