Identification of location errors by a touch-trigger probe on five-axis machine tools with a tilting head

This paper presents a scheme to calibrate the error map of the rotary axes of a five-axis machine tool. This is done by means of on-the-machine measurement of a test piece using a contact-type touch-trigger probe. The present probing-based approach is more suitable for efficient and automated “self-calibration,” than conventional calibration schemes, such as ball bar tests or R-test. It is thus advantageous in the application to periodic checking of the error map, or periodic updating of its numerical compensation. In the present approach, a test piece of arbitrary geometry, e.g. a raw unmachined workpiece, can be used as the probing target. An experimental demonstration is presented.

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Measurement Accuracy Investigation of Touch Trigger Probe with Five-Axis Machine Tools

Archive of Mechanical Engineering ◽

10.1515/meceng-2016-0028 ◽

2016 ◽

Vol 63 (4) ◽

pp. 495-510 ◽

Cited By ~ 1

Author(s):

Md. Mizanur Rahman ◽

J.R.R. Mayer

Keyword(s):

Machine Tool ◽

Machine Tools ◽

Accuracy Assessment ◽

Cutting Fluid ◽

Surface Wetness ◽

Measuring Surface ◽

Surface Irregularities ◽

Touch Trigger Probe ◽

Compact Design ◽

Five Axis

Abstract The touch trigger probe plays an important role in modern metrology because of its robust and compact design with crash protection, long life and excellent repeatability. Aside from coordinate measuring machines (CMM), touch trigger probes are used for workpiece location on a machine tool and for the accuracy assessment of the machine tools. As a result, the accuracy of the measurement is a matter of interest to the users. The touch trigger probe itself as well as the measuring surface, the machine tool, measuring environment etc. contribute to measurement inaccuracies. The paper presents the effect of surface irregularities, surface wetness due to cutting fluid and probing direction on probing accuracy on a machine tool.

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On-machine measurement of location errors on five-axis machine tools by machining tests and a laser displacement sensor

International Journal of Machine Tools and Manufacture ◽

10.1016/j.ijmachtools.2015.05.004 ◽

2015 ◽

Vol 95 ◽

pp. 1-12 ◽

Cited By ~ 27

Author(s):

Zhouxiang Jiang ◽

Bao Song ◽

Xiangdong Zhou ◽

Xiaoqi Tang ◽

Shiqi Zheng

Keyword(s):

Machine Tools ◽

Displacement Sensor ◽

Laser Displacement Sensor ◽

Location Errors ◽

Five Axis

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Accuracy Enhancement of Alignment for Five-Axis CNC Machine Tools through Touch Trigger Probes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.381.11 ◽

2011 ◽

Vol 381 ◽

pp. 11-15

Author(s):

Sheng Bao ◽

Fu Zhang ◽

Xi Zhang

Keyword(s):

Reference Frame ◽

Machine Tools ◽

Measuring Method ◽

Least Square ◽

Cnc Machine Tools ◽

Random Errors ◽

Cnc Machine ◽

Method Of Least Square ◽

Touch Trigger Probe ◽

Five Axis

The random errors exist in measuring with touch trigger probe. These errors are directly introduced into workpiece coordinate system with conventional alignment method. An enhanced measuring method is proposed in this paper to improve the accuracy of alignment for five-axis CNC machine tools. By using the method of least square, an error reference frame is constructed, and the relationship between the alignment parameters and the error reference frame is derived. An example of aircraft structural parts is presented to validate the presented method.

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