The development of a triple ball bar system for calibration of CNC machine tools
Journal
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Journal Volume
220
Journal Issue
5
Pages
759-766
Date Issued
2006
Author(s)
Abstract
The accuracy of machine tools restricts the dimensional accuracy of parts processed thereon. It is, therefore, necessary to monitor the errors of machine tools constantly. Normally, it takes a long set-up time before one can observe the machine tool and monitor its errors. The cost of such delays is inevitably high. As for CNC, the conventional measurement system is capable of measuring one-dimensional signals, as a laser interferometer does, and two-dimensional signals, as a grid encoder does. Three-dimensional measurement techniques, however, are far from being well developed and are not yet well known. This paper proposes a triangulation method incorporating three built-in linear-scale ball bars that requires less set-up time and lower costs than the laser ball bar system, and is capable of acquiring threedimensional signals with greater accuracy with the extension bars, so that large volumes can be checked. ? IMechE 2006.
Subjects
Ball bar
Grid encodes
Machine tool errors
Volume error
Calibration
Computer control
Error analysis
Numerical control systems
Triangulation
Machine tools
Type
journal article