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Thread: Ultimate guide to Micrometers
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20th Apr 2019, 03:18 AM #16
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.
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20th Apr 2019, 09:58 AM #17Member: Blue and white apron brigade
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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.
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20th Apr 2019, 11:01 AM #18Diamond Member
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Using a dial bore gauge could be an option as well for getting into deep bores.
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20th Apr 2019, 07:32 PM #19
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.
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21st Apr 2019, 08:36 PM #20Gear expert in training
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21st Apr 2019, 09:59 PM #21Most Valued Member
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21st Apr 2019, 10:04 PM #22Gear expert in training
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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.
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21st Apr 2019, 10:21 PM #23Golden Member
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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.
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22nd Apr 2019, 03:46 AM #24
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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