Open AccessImprovement of machine tool accuracy through ball screw location optimisation in relation to the guideways of the axes
Author(s) -
A. D. Stoica,
Gheorghe Stan
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/916/1/012115
Subject(s) - ball (mathematics) , ball screw , machine tool , stiffness , constructive , computer science , relation (database) , rotary encoder , mechanical engineering , engineering , encoder , mathematics , structural engineering , geometry , process (computing) , database , nut , operating system
An important role in obtaining a high positioning accuracy is also played by the location of the ball screw in relation to the guideways of each axis. This makes that noncompliance with the Abbé principle to lead to higher positioning deviations. The compliance with the Abbé principle is difficult to be achieved from the constructive point of view because the cutting forces differ in terms of direction, sense and value within the working space of the machine tool. This work develops a mathematical model that allows finding the location direction of the ball screw in relation to the guideways, so that the positioning accuracy is increased. The conditions that may influence the improvement of the positioning accuracy by increasing the guideway stiffness and settling the dimensions of the moving element are studied in this work, as well. The mode of locating the position encoder in case of direct measurement that, together with the noncompliance of the Abbé principle leads to affecting the positioning accuracy is also presented. The results have been obtained experimentally on a milling machine where the ball screws have been located symmetrically in relation to the main guideway.