Some important characteristics of gauge-block artefacts for international comparison

Abstract

This letter takes a brief look at gauge-block length as it is influenced to a subtle degree by the surface quality of the measuring face and the recent history of the gauge block environment. Change in length of short gauge blocks following wringing, and of long gauge blocks following air travel between laboratories, is demonstrated. These effects could have important implications for international comparison testing under time-limited conditions, particularly with the large number of comparisons related to the Mutual Recognition Arrangement (MRA).

Long-term dimensional stability of a line scale made of low thermal expansion ceramic NEXCERA

“…The change in length of the line scale due to the environment was corrected with the following formulae for scale temperature using equation ( 5) and for ambient pressure using equation ( 6) [27][28][29]:…”

Use of Thermomechanical Analysis in the Design of a Composite System with a Low Coefficient of Longitudinal Thermal Expansion for End Gauges

“…According to the current survey, using composite materials as materials for end gauges is not addressed at the national or international level. [1,2,3,4] Composite materials have been used advantageously for many decades in some industries. Over time, carbon fibers in various forms have become the most effective reinforcing material for polymer matrices.…”