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2 Advances in Science and Technology. Research Journal

2 2017

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Elimination of thermal drift in measuring the positioning accuracy of a three axis milling machine

Stejskal T., Dovica M., Demeč P., Svetlík J., Rajťuková V.

Advances in Science and Technology. Research Journal

2017

Vol. 11, no 4

159--167

The aim of this paper is to draw attention to more reliable verification method of positioning accuracy. The improvement lies in mathematical elimination of thermal impact during the measurement process. This thermal impact, always present during the motion of movable parts, is of a special systemic character. It increases the indefiniteness of measurement of the classic measurement method. This measurement uncertainty can be reduced by implementing the procedure introduced in this paper. The reduction can be achieved by separating the temperature impact from other sources of inaccuracy. Such separation is a very new solution. The methodology relies on mathematical processing and does not depend on the manner of accuracy measurement. The evaluation method also yields diagnostic information on the machine’s condition. The experiments were performed with the use of laser interferometer.

CNC milling machine precision analysis through numerical modelling

Svetlík J., Demeč P., Kráľ J.

Advances in Science and Technology. Research Journal

2017

Vol. 11, no 2

212--219

The motive behind the effort to make virtual prototyping more sophisticated is first of all cost reduction of manufacturing machine design, followed by reduction of lead time for development, prototyping and testing of the pre-manufacturing machine series. This article deals with the analysis of manufacturing precision of a 3-axial, numerically controlled milling machine. The methodology for precision analysis rests on a selected simplified numerical calculation model of a manufacturing machine on which virtual machining has been conducted. The mechanical inaccuracy itself is calculated by computer via the FEM analysis. The results are processed for visualization by the Excel software.