Method for Precise and Repeatable Machine Tool Adjustment on Foundation

Abstract

This article deals with placement of machine tools on a foundation. Special attention is paid to the levelling adjustment process for machines with a self-supporting frame that are free -standing on a foundation. These machines are normally placed on a foundation in a statically indeterminate way. Consequently, the machine levelling adjustment process is not repeatable. This paper presents an analysis of the current state of alignment, highlights the shortcomings of the standard alignment process and demonstrates them with measurements. The paper also presents a new method that allows alignment of the machine to the desired geometry while also ensuring a defined distribution of the machine weight, respectively the distribution of gravitational forces on the individual levelling elements (feet). The presented method uses machine alignment on so-called smart feet and subsequent unique transfer to standard feet. The method has been successfully verified in the alignment of a standard machine tool.