Formulation of Influence of Machine Geometric Errors on Five-Axis On-Machine Scanning Measurement by Using a Laser Displacement Sensor

Abstract

For on-machine measurement of workpiece position, orientation, and geometry on machine tools, five-axis continuous (scanning) measurement by using a laser displacement sensor has a strong advantage in its efficiency, compared to conventional discrete measurement using a touch-triggered contact probe. In any on-machine measurement schemes, major contributors to their measurement uncertainty are error motions of the machine tool itself. This paper formulates the influence of geometric errors of rotary axis average lines on the measurement uncertainty of the five-axis on-machine measurement by using a laser displacement sensor. To validate the present simulator, experimental comparison of measured and simulated trajectories is conducted on five-axis on-machine measurement of a precision sphere of the precalibrated geometry. For total 28 paths measured on the spherical surface, an error in the simulated trajectories from measured trajectories (properly low-pass filtered) was at maximum 5 lm. Uncertainty assessment demonstration for more practical application example of a turbine blade measurement is also presented.

A Fast Measuring Method for the Inner Diameter of Coaxial Holes

“…In the installation of the measuring rod, it is located in the center of the holes of no more than ±2 mm. For r m < 75 mm, the inclination angle ( θ sen ) caused by the installation of measuring rod is 1.53°, which can meet the angle deviation requirement of LDS [19]. Under the above conditions, the major error of the LDS is its measuring linear error.…”

Characterization and Correction of the Geometric Errors Using a Confocal Microscope for Extended Topography Measurement, Part II: Experimental Study and Uncertainty Evaluation

“…Among the investigations of lateral calibrations, many studies focus on the optical system [12]. For example, H. Ni et al proposed a new method to achieve structured detection using a spatial light modulator, which modulates the Airy disk amplitude distribution according to the detection function in the collection arm [13] and B. Wang et al presented confocal microscopy with structured detection in a coherent imaging process to achieve a higher resolution with a comparably large pinhole [14], however, the systematic geometric errors which adversely affect the relative position and orientation between measuring probes and measurands are usually neglected [15,16]. B. Daemi et al designed a comprehensive verification test by using a high precision metrology method based on subpixel resolution image analysis [17].…”

On the limitation of dual-view triangulation in reducing the measurement error induced by the speckle noise in scanning operations

“…Simpler and thus lowercost configuration of this sensor is also a crucial advantage in industrial applications. In [14,15], a part of the authors employed the same sensor as the one used in this paper.…”