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Contact Deformation in Gage Block Comparisons; NBS Technical Note 962; 1978

Beers, J.; Taylor, J.

NBS Technical Note 962; 46p. May 1978.

Calibration; comparator; deformation; gage blocks; length; metrology.

When calibrating gage blocks or when gaging objects with contact type comparators, local deformation occurs where the probe tip contacts the gaging surface. This deformation results in a measurement error only if the gage blocks or objects being compared are of different materials having different mechanical properties. This document presents formulas and monographs for determining deformation magnitude, and instructions for applying deformation corrections. The formulas and monographs are valid only for spherical probe tips. A method is given for evaluating tip geometry and it is recommended that non-spherical or flawed tips be replaced.

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