Conclusions
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1.
Standards 7 mm high of any scale C hardness after the application of more than 72 indentations virtually cease to satisfy the requirements of standards with respect to deviation from planeness.
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2.
With respect to scatter of hardness values, standards 7 mm high do not meet the requirements of the 2nd class at HRC 65±5 after 72 indentations and at HRC 45±4 and 25±5 after 144 indentations.
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3.
With consideration of [2] we can suggest that to secure the permissible deviations from planeness of ±0.005 mm, the minimum height of the standards would be 8 mm, which should be taken into account when manufacturing the standards.
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Literature cited
Hormuth, Pomiary Automatyka Kontrola, No. 5–6 (1958).
A. V. Smirnov and E. D. Rodkevich, Izmeritel'. Tekh., No. 5 (1963).
Additional information
Translated from Izmeritel'naya Tekhnika, No. 9, pp. 50–51, September, 1970.
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Smirnov, A.V., Sakhov, V.B., Boyarina, A.M. et al. Effect of the number of indentations on the scatter of hardness values of standards. Meas Tech 13, 1369–1370 (1970). https://doi.org/10.1007/BF00982010
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DOI: https://doi.org/10.1007/BF00982010