By S. A. Tobias and F. Koenigsberger (Eds.)
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Extra resources for Advances in Machine Tool Design and Research 1967. Proceedings of the 8th International M.T.D.R. Conference (Incorporating the 2nd International CIRP Production Engineering Research Conference), the University of Manchester Institute of Science and Techno
This paper will discuss the machine errors which are corrected by instrumentation, the details of this installation, its performance as supported by data, the characteristics of the instrumentation required, and the extension of these concepts to additional error correction on this machine and other machines. INTRODUCTION Precision and accuracy have always been obtained by providing straight ways, stable frames, and other techniques which can be called a "brute force" approach. This "brute force" approach is expensive not only in the initial fabrication of the machine but also in the future maintenance of these qualities.
Then when the first machining operation is finished the tape will stop and a zero shift induced to move the tool to the other end of the component from which the second cycle would begin. In this way no "overshoot" errors would occur that are prevalent using the present system. Further investigation is now possible into the accuracy of the interpolation tolerance and its range of use. Before compensation of the alignment and backlash errors this investigation was found to be impossible. The machine used in this project incorporated only 2D control, whereas alignment error compensation theory was developed to include the third axis.
The angle of the profile, as explained above and shown in Fig. 7, was programmed to )e 45 degrees, but the actual profile angle was measured as having a 5 minute inaccuracy. This inaccuracy necessitated a manual compensation, as explained in the results, as it vas due to factors not covered in this report. These were the effects of mismatching of the nechanisms in each of the two axes. e. steady state, velocity, and acceleration errors. Theoretically these factors were identical br the X and Y axis, but this test showed that, in practice, an error in the system existed hat could only be corrected by a dynamic analysis of the complete drive and feedback ystem.