ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 6

Measurement of the Spherical Tip of Rockwell Indenters

Barbato, G
Chief and Senior Technician, Hardness Research Group, Istituto di Metrologia, “G.Colonnetti”, Torino,

Desogus, S
Chief and Senior Technician, Hardness Research Group, Istituto di Metrologia, “G.Colonnetti”, Torino,

(Received 13 February 1987; accepted 18 December 1987)

Abstract

Recent international comparisons of primary standards of Rockwell C hardness showed that the indenter shape is largely responsible for differences in measurement results. Measurements, especially of spherical-tip shape, made by means of high-magnification (500 ×) profile projectors proved to be affected by an uncertainty that also depended on the operator. In connection with such problems, a measurement system using a rotating table centered by means of an air bearing was developed together with a method for result analysis so as to allow the evaluations required by ASTM and ISO standards to be made quickly.

Keywords:
Rockwell hardness, diamond indenter, roundness measurement

Paper ID: JTE11080J
DOI: 10.1520/JTE11080J
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