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112 Part II: Metrology
Part II.E.6
9. Evaluating geometric tolerance conditions by defining type of form
and positional relationship, such as roundness, flatness, straightness,
parallelism, or squareness.
10. Hole diameter and location checking considering maximum and
minimum material conditions as defined in ANSI Y14.5.
11. Friendly operator interfaces for self-teaching of part programs.
12. Other software for statistical analysis includes graphic data display,
histograms, integration of areas under a curve, contour plotting,
automatic part or lot acceptance or rejection based on statistical
evaluation, and so on.
OTHER MEASURING STANDARDS
Along with working standards for length and angle measurements, there must
be standards of geometric shape to serve as masters for the inspection of manufactured
components and systems. Standards of this type are simply defined in
common geometric terms and require no special definition. Taking the form of
flats, straightedges, right angles, circles, balls, and the like, they are manufactured
of hardened and stabilized steel to extremely close tolerances (as close as manufacturing
technology permits) so that they approximate the geometric shape that
they embody. A precision straightedge may be used to determine the straightness
of travel of a slide on a machine tool. A master square may be used to determine
the deviation from orthogonality of machine axes. A master circle may be used
to inspect the truth of rotation of a machine-tool spindle. Such measurements are
ultimately essential to the quality of manufactured parts, since a machine tool can
not produce parts to precise specifications if it is not precisely produced itself.