Application of a diffraction grating and position sensitive detectors to the measurement of error motion and angular indexing of an indexing table

Liu, Chien-Hung; Jywe, Wen-Yuh; Shyu, Lih-Horng; Chen, Chun‐Jen

doi:10.1016/j.precisioneng.2004.12.002

Cited by 27 publications

(10 citation statements)

References 2 publications

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“…The influence of installation eccentricity is introduced. Many previous studies have proposed other methods to measure the error motions of the spindle [17][18][19][20]. We used the contact measurement method based on the features of the rotation joint.…”

Section: Radial Error Motion Measurementmentioning

confidence: 99%

A New Method of Angle Measurement Error Analysis of Rotary Encoders

Jia

et al. 2019

Applied Sciences

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In this article, a method of error source analysis and detection to improve the angle measurement accuracy of rotary encoders in precision measuring instruments is proposed. The angle measurement error caused by the installation eccentricity of the grating disk and the radial error motion of the rotating shaft is analyzed, and the error model is built. The method of measuring the radial error motion is introduced, and the visual system and image processing technology is proposed to detect the eccentricity. The verification experiment by the use of an autocollimator and a polygon is carried out. The residual error after comparison within ±6″ accounts for 9% of the angle measurement error. The proposed error model is verified, and the angle measurement error can be predicted if the installation eccentricity and radial error motion are known.

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Section: Radial Error Motion Measurementmentioning

confidence: 99%

A New Method of Angle Measurement Error Analysis of Rotary Encoders

Jia

et al. 2019

Applied Sciences

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“…Non-bar system was an optical calibration system with no linkage bar, consisting of a master detector module, a ball lens module and a signal module. Non-bar system measures the total error of multiple axes movement simultaneously [9][10][11][12][13][14][15] and the installation is quite easy. Compensation method is produced by Yuan et al [8], which is a real-time compensation technique.…”

Section: Introductionmentioning

confidence: 99%

Length Distortions of a Spindle Under the Influences of Temperatures Rising Duration Machining and Compensation Solution

Tran¹,

Jywe²,

Hsieh³

2018

Preprint

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Facing with errors of a product after machining was a big title in this field. That will affect to product's quality with unpredictable situation when products is in use for some particular application such as in medical facilities. Improving the precision of machine tools by exploring temperature on multiple points and measuring differential locations of the spindle is going to be executed in this study. A temperature measurement tool and a software running on Windows platform have been developed and combining with Non-bar system in order to support analyzing the temperature rising with the changes of length of the spindle to find the compensation solution based on eccentricity and length distortion. In this study, the whole tests have done on UX300 five -axis CNC machine tools for this investigation and the errors after applying compensation function have reduced 70% at least, with respect to the errors after machining without using compensation function.

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“…It is known that longer testing times result in increased environmental influence. Therefore, many previous studies have proposed various multi-degree-of-freedom (MDOF) measuring methods for an axis of rotation (for spindles) and a rotary table, 13–25 but they all investigated the error separation techniques among combined errors. The rotary angular positioning error caused by other effective errors, such as tilt and radial errors, has little been investigated.…”

Section: Introductionmentioning

confidence: 99%

A novel method of angular positioning error analysis of rotary stages based on the Abbe principle

Fan

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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Abbe error is the inherent systematic error in linear displacement measurement due to the measuring axis being out of line with the moving axis. The resulting gap is called the Abbe offset, which will multiply the angular pitch error of the moving stage to become the positioning error of the linear stage along the moving axis. Analogous to the Abbe principle, in the rotary stage, the rotary encoder is used to detect the worktable’s rotational angle. The encoder is normally mounted at a distance from the bearing. This distance can be also regarded as Abbe offset. Due to the inherent tilt and radial motions of the axis of rotation, the encoder’s rotating component, that is, the circular grating, would result in a lateral displacement relative to its sensing head that is fixed inside the stage housing. The actual measured angle is, therefore, different from the commanded angle, causing the angular positioning error of the rotary stage in machine tools and open-loop controlled system. In this article, the angular positioning error of the rotary stage caused by the tilt motion error and radial motion error of the spindle, the offset and the size of encoder is analyzed and experimentally verified.

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Application of a diffraction grating and position sensitive detectors to the measurement of error motion and angular indexing of an indexing table

Cited by 27 publications

References 2 publications

A New Method of Angle Measurement Error Analysis of Rotary Encoders

A New Method of Angle Measurement Error Analysis of Rotary Encoders

Length Distortions of a Spindle Under the Influences of Temperatures Rising Duration Machining and Compensation Solution

A novel method of angular positioning error analysis of rotary stages based on the Abbe principle

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