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Bore Micrometer v CMM

Bore Mic - 3 point contact.

CMM - at least 12 points using least square calculation method.

Which is correct method?

Parents
  • It really depends:

    1) I'm assuming a standard, which supports LSQ.  If that's the case, the CMM would, in theory, be more correct. 

    2) CMMs are rarely the most accurate tools for diameter calculation.

    3) However, it depends on form.  The world's most accurate 2-point super-micrometer would report an equilateral triangular object as the same diameter at all points.

Reply
  • It really depends:

    1) I'm assuming a standard, which supports LSQ.  If that's the case, the CMM would, in theory, be more correct. 

    2) CMMs are rarely the most accurate tools for diameter calculation.

    3) However, it depends on form.  The world's most accurate 2-point super-micrometer would report an equilateral triangular object as the same diameter at all points.

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