2018 Volume 53 Issue 4 Pages 313-322
In recent years, the CMMs (Coordinate Measuring Machines) quickly have been spreading over the manufacturing industry. Under the circumstances, the environmental conditions and installation sites of CMMs have been changed from the temperature control room to the workshop environment and the production line without air conditioning. However, even in severe environment the demand to high accuracy measurements by CMM has been increasing still more. Thereby, the methods to evaluate and realize the high accuracy measurements by CMM in workshop environment have been investigated. In this paper, we clarify the factor of scale error and propose the effect and correction method of temperature measurement errors using scale error of CBG (Low-expansion Ceramics Gauge Block) and MBG (Metal Gauge Block). The scale error can be reduced by installing thermometers for temperature correction at optimum positions and increasing the accuracy of the thermometers. Compared with MBG, CBG was able to confirm that the scale error of CMM can be evaluated without being affected by temperature change of workpiece. Additionally, the performances of the adiabatic material are tested and confirmed experimentally.
