Probe of a coordinate measuring machine measures metallic precision part with holes

Precision granite for metrology

Experience in the manufacture of measuring and test stands as well as coordinate measuring machines shows that granite has clear advantages over conventional materials.

 

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Why granite in measurement technology?

Measurement deviations must be minimised in order to achieve high measurement accuracy. The mechanical design is the factor that can be influenced most effectively and sustainably. The use of granite in metrology is one such factor to influence the design of CMMs. Granite has a lower coefficient of expansion compared to metallic materials (approx. 5 µm/m*K), and therefore a lower absolute expansion compared to these (e.g. steel α = 12 µm/m*K). Intrinsic stability, temperature resistance, vibration damping and guideway accuracy are the four properties that make granite the ideal material for coordinate measuring machines.

Two coordinate measuring machines in an air-conditioned room - granite as a stable base for high-precision measurement technology
Built with REITZ' granite: PMM-G measuring machine from Leitz
Electronic spirit level measuring device on granite plate for flatness testing in quality assurance

Measuring plates

The evenness of the surface is crucial

Measuring plates made of granite are aids in quality assurance for measuring production parts. Granite plates are used across all industries for measuring and testing equipment wherever precision must be repeatable. The evenness of the surface is of great importance. The high surface quality is achieved by grinding and then manually lapping the granite measuring plate. Depending on the quality class, several measuring and lapping processes are necessary.
Probe head of a measuring machine scans metal workpiece on granite base

Precision granite in measurement technology

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