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A new measurement system to determine stiffness distribution in machine tool workspace

Pawełko Piotr, Jastrzębski Daniel, Parus Arkadiusz, Jastrzębska Joanna

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 2

157--168

This paper presents an innovative system determining machine tool quasi-static stiffness in machining space, so-called Stiffness Workspace System (SWS). The system allows for the assessment of the accuracy of a machine which has become a vital aspect over past years for machine tool manufacturers and users. Since machine tools static stiffness is one of the main criteria using to evaluate the machines' quality, it is crucial to highlight the relevance of experimental and analytical stiffness determination methods. Therefore, the proposed method is applied to estimate the spatial variation of static stiffness in the machine tool workspace. This paper describes the SWS system-its design, working principle, mounting conditions and signal processing. The major advantage of the system is the capability to apply forces of controlled magnitude and orientation as well as simultaneously measure the resulting displacements. The obtained results give possibility to estimate and evaluate static stiffness coefficients depending on the position and direction under loaded conditions. The results confirm the validity of the analyses of spatial stiffness distribution in the machine workspace.

Simplifications of the volumetric error model because of the structural loop of machine tools

Majda Paweł, Jastrzębska Joanna

Archives of Mechanical Technology and Materials

2019

Vol. 39

11--15

After many years of intensive work the international experts from ISO TC 39 published the technical report called ISO TR 16907 "Machine tools - numerical compensation of geometric errors". This document defines the terminology, presents benefits and limitations of numerical compensation of machine tools' and measuring machines' errors. It gives machines manufacturers and users vital information about how to use numerical compensation. In the context of those types of compensation defined in ISO TR 16907, this article shows rules of selecting models of Volumetric Error for three-axis machine tools. What is more, this paper presents some principles of reduction of these proposed models because of the functional tasks for machine tools. One of the obtained results is an array of reduced models for three-axis machine tools. This array determines the degree of detail of the model and the experimental research program that needs to be carried out in order to determine the Volumetric Error distribution.