Comparative study of the static andquasi-static compliance measurementprocedures on machine tools

Sammanfattning: There is an increasing trend in manufacturing industry for producing complex and delicate parts. As a result, the importance of having a deeper understanding of machine systems, in order toget higher accuracy of machined parts, arises. This leads to an increasing demand of testingmachine accuracy under operational condition. There are methods that has been investigated in order to test under operational condition. However, the studies were mostly focused on thestatic, quasi-static and dynamic states separately and comparison were not investigated. This thesis aims at presenting a comparative study of static and quasi-static compliance on machine tool under loaded conditions, to investigate how the stiffness changes from static toquasi-static state, and also the potential factors that would lead to this result. A 5-axis machine tool- Hermle C50U machine is used in order to perform the measurements.The method chosen for the measurements includes circular tests under loaded conditions utilizinga loaded double ball bar device. Three LVDTs are used for the measurements, in order to detect the deflection along the circular trajectory. The main parameter that undergoes study is the effect of the applied feed rate. After the measurements, the data is analyzed using MAT-LAB and the average deflections for both states are compared. In general, the results show that there is no significant difference between the two states, despite the observed different shape ofdeflection.