Polishing and testing of TMT reference sphere

2020 ◽  
Author(s):  
Dijana Bogunović ◽  
Graeme Jonas ◽  
Dave M. Cochrane ◽  
Sripadmanaban Sriram ◽  
Gadiyara C. Anupama
Keyword(s):  
Reference Sphere

Measurement of form error of a probe tip ball for coordinate measuring machine (CMM) using a rotating reference sphere

2020 ◽  
Vol 61 ◽  
pp. 41-47 ◽  
Author(s):  
So Ito ◽  
Daisuke Tsutsumi ◽  
Kazuhide Kamiya ◽  
Kimihisa Matsumoto ◽  
Noritaka Kawasegi
Keyword(s):  
Coordinate Measuring Machine ◽  
Form Error ◽  
Reference Sphere ◽  
Measuring Machine

An Optimized Algorithm for Discretization of Cutter Location Points on the Laser Cutting Path of Three-Dimensional Surface

2012 ◽  
Vol 190-191 ◽  
pp. 19-22
Author(s):  
Jun Hu ◽  
Fan Deng ◽  
Xian Chen Qiu
Keyword(s):  
Laser Cutting ◽  
Three Dimensional ◽  
Automatic Programming ◽  
Step Size ◽  
Starting Point ◽  
Discretization Step ◽  
Reference Sphere ◽  
Programming Software ◽  
Cutting Path ◽  
Dimensional Surface

This paper proposed an optimized algorithm for discretization of cutter location points on the laser cutting path of three-dimensional surface. The initial discretization step size was calculated due to the curvature of the curve on the starting point and accuracy requirements. A reference sphere was established by taking the initial discretization step size as the radius. The initial cutter location point was located on the intersection of the reference sphere and the processing path. The radius of reference sphere was dynamically adjusted by dichotomy according to string height difference in order to get the optimal cutter location on the path to be processed. This algorithm has a high computational efficiency. And an automatic programming software used for three-dimensional laser cutting was developed based on this algorithm.

A simple ball averager for reference sphere calibrations

2005 ◽  
Author(s):  
Ulf Griesmann ◽  
Quandou Wang ◽  
Johannes Soons ◽  
Remi Carakos
Keyword(s):  
Reference Sphere

Determination of the optimal reference sphere

1979 ◽  
Vol 69 (7) ◽  
pp. 1045 ◽  
Author(s):  
Kazimierz Pietraszkiewicz
Keyword(s):  
Reference Sphere

scholarly journals Identification Method of Error Motions and Geometric Errors of a Rotary Axis by R-Test

2020 ◽  
Vol 14 (3) ◽  
pp. 399-408
Author(s):  
Takaaki Kenno ◽  
Ryuta Sato ◽  
Keiichi Shirase ◽  
Shigemasa Natsume ◽  
Henny Spaan ◽  
...  
Keyword(s):  
High Precision ◽  
Machine Tools ◽  
Geometric Errors ◽  
Rotary Table ◽  
Test Device ◽  
Motion Error ◽  
Rotary Axis ◽  
Measurement Results ◽  
Reference Sphere ◽  
Precision Machine Tools

While evaluating the accuracy of high-precision machine tools, it is critical to reduce the error factors contributing to the measured results as much as possible. This study aims to evaluate both the error motions and geometric errors of the rotary axis without considering the influence of motion error of the linear axis. In this study, only the rotary axis is moved considering two different settings of a reference sphere, and the linear axes are not moved. The motion accuracy of the rotary axis is measured using the R-test device, both the error motions and geometric errors of the rotary axis are identified from the measurement results. Moreover, the identified geometric errors are verified for correctness via measurement with an intentional angular error. The results clarify that the proposed method can identify the error motions and geometric errors of a rotary axis correctly. The method proposed in this study can thus be effective for evaluating the motion accuracy of the rotary axis and can contribute to further improvement of the accuracy of the rotary table.

scholarly journals A Simple Integrated Geometrical Error Model for Laser Tracer

2018 ◽  
Vol 208 ◽  
pp. 03006
Author(s):  
Huixu Song ◽  
Hongfang Chen ◽  
Zhaoyao Shi
Keyword(s):  
Measurement Accuracy ◽  
Laser Interferometry ◽  
Error Model ◽  
Numerical Control ◽  
Measuring System ◽  
Geometrical Error ◽  
Coupling Relationship ◽  
Geometrical Errors ◽  
Reference Sphere ◽  
Simulation Results

Geometrical errors of 2D gimbal mount axes are studied for laser tracer for the sake of realizing rapid detection for numerical control equipment. The high precision reference sphere, which serves as the reflection unit and is set on the base, avoids the influence on measurement accuracy caused by the movements of rotatory axes, and ensures that laser tracer owns large tracing angle. The nonlinear coupling relationship between the geometrical errors and the measurement accuracy of laser tracer is analyzed; the integrated geometrical error model of 2D gimbal mount axes and laser interferometry system is established; the error map of the measuring system is brought. The simulation results demonstrate that the measurement error of the laser tracer is certain and unique after the value and direction of all the geometrical errors determined.

Sphericity Measurement Using Stitching Interferometry

2012 ◽  
Vol 523-524 ◽  
pp. 883-888 ◽  
Author(s):  
Takeshi Hagino ◽  
Yuichiro Yokoyama ◽  
Yutaka Kuriyama ◽  
Han Haitjema
Keyword(s):  
Standard Deviation ◽  
High Precision ◽  
Measurement System ◽  
Three Dimensional ◽  
Measuring Method ◽  
Surface Areas ◽  
Reference Sphere ◽  
Five Axes ◽  
Roundness Measurement ◽  
Good Agreement

A newly developed practical sphericity measurement system by means of stitching interferometry is described in this paper. Spheres are widely used in industry. In particular, spheres with stem are usually used in metrological applications such as reference sphere for Coordinate Measuring Machines. It is common to calibrate form of spheres with tactile roundness measurement, however a comprehensive form measurement is desired for evolving high precision applications. The developed system consists of commercial base Fizeau type interferometer to capture partial surface areas of sphere and five axes stages to handle sphere with stem. Hence the system is very suitable for measurement of such stemmed spheres. This system yields three dimensional form maps of stitched sphere and peak to valley sphericity. Standard deviation of sphericity value yielded using this system is less than 5 nm in 8 times repetition. Finally, an equatorial profile clipped from stitched sphere shows good agreement with a result of tactile roundness measuring method within 10 nm typically.

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