For measuring machines and machine tools, geometrical accuracy is a key performance criterion. While numerical compensation is well established for CMMs, it is increasingly used on machine tools in addition to mechanical accuracy. This paper is an update on the CIRP keynote paper by Sartori and Zhang from 1995 [Sartori S, Zhang GX (1995) Geometric error measurement and compensation of machines, Annals of the CIRP 44(2):599–609]. Since then, numerical error compensation has gained immense importance for precision machining. This paper reviews the fundamentals of numerical error compensation and the available methods for measuring the geometrical errors of a machine. It discusses the uncertainties involved in different mapping methods and their application characteristics. Furthermore, the challenges for the use of numerical compensation for manufacturing machines are specified. Based on technology and market development, this work aims at giving a perspective for the role of numerical compensation in the future.

Geometric error measurement and compensation of machines : an update

Geometric Error Measurement and Compensation of Machines

Design for precision : current status and trends

https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1467&context=mechengfacpub

Task Specific Uncertainty in Coordinate Measurement

Purpose – The purpose of this research is to extend the previous approach to software error compensation to fused deposition modeling (FDM) machines and explores the approach to apply compensation by correcting slice files.Design/methodology/approach – In addition to applying the stereolithography (STL) file‐based compensation method from earlier research; a new approach using the slice file format to apply compensation is presented. Under this approach, the confounded effects of all errors in a FDM machine are mapped into a “virtual” parametric machine error model. A 3D artifact is built on the FDM machine and differences between its actual and nominal dimensions are used to estimate the coefficients of the error functions. A slice file compensation method is developed and tested on two types of parts as a means for further improving the error compensation for feature form error improvement. STL file compensation is also applied to a specific FDM 3000 machine and the results are compared with those of a ...

Error compensation for fused deposition modeling (FDM) machine by correcting slice files

Self-calibration method and software error correction for three dimensional coordinate measuring machines using artefact measurements

Results of the CIRP-Euromet Intercomparison of Ball Plate-Based Techniques for Determining CMM Parametric Errors

The proposed self-calibration method, like other methods, uses a ball plate for the error identification, but unlike other methods the ball plate needs not to be calibrated, i.e. the distances between the different balls on the plate need not to be known accurately. After the measurement of the ball plate in different positions in the measuring volume, the systematic geometrical errors in the geometric error model of the measuring machine can be computed. This geometrical error model is used by the software error correction to correct on-line every single measurement of the measuring machine. This results in a higher accuracy for the measuring machine. The self-calibration method has been carried out on a CNC 3D-CMM and the resulting software error correction has been evaluated using stepgauge measurements. The evaluation results show that the systematic geometrical errors are largely reduced.

L. De Jonge

Papers

Self-calibration method and software error correction for three dimensional coordinate measuring machines using artefact measurements

Results of the CIRP-Euromet Intercomparison of Ball Plate-Based Techniques for Determining CMM Parametric Errors

Self-Calibration Method for Three Dimensional Coordinate Measuring Machines Using a Ball Plate