Abstract
This paper presents the evaluation of the influence of the feedmotion speed on the value of selected geometric errors of CNC lathe CTX 310 eco by DMG, indentified by QC 20 Ballbar system. Diagnostically evaluated were: the deviation of the axis squareness, reversal spike, and backlash. These errors determine the forming of the dimensional and shape accuracy of a machine tool. The article discusses the process of the CNC diagnostic test, the diagnostic evaluation and formulates guidelines on further CNC operation. The results of measurements were presented in tables and diagrams.
Highlights
The diagnostics of CNC machines is the main task during the technological machine operation
Its variability depends on the feedmotion speed
The smallest value was observed for the feedmotion speed vf1 = 500 mm/min and is –66.2 μm/m, for vf2 = 1000 mm/min equals –83.2 μm/m, the third measurement for vf3 = 1500 mm/min is –78.4 μm/m, and the highest value for the feedmotion speed vf4 = 2000 mm/min and equals –83.6 μm/m
Summary
The diagnostics of CNC machines is the main task during the technological machine operation. Each machine tool during operation is prone to wearing down over a time span. It should be tested periodically – and its geometric condition diagnosed at a required frequency. Both the machines already in operation as well as the machines ordered by buyers are diagnosed. Each such machine is tested and checked before it arrives at the customer’s. The fundamental limitation of the stationary interferometric methods in the machine measurements is the considerable time amount needed to set the interferometer’s optics, especially for the machines of a tooling range over a few meters. QC 20 Ballbar or Ballbar API Automated Precision Inc. or Ballbar DBB 110 by DMG are the examples of contact diagnostics and measurement systems (Fig. 1)
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