Simultaneous Measuring Method of Geometric Errors in Machine Table Motion

1994 ◽  
pp. 657-662
Author(s):  
S. Shimizu ◽  
H.S. Lee ◽  
N. Imai
Keyword(s):  
Measuring Method ◽  
Geometric Errors ◽  
Table Motion ◽  
Simultaneous Measuring

Measuring and Modeling of Volumetric Errors for Vertical Machining Centers Based on Bi-Directional Laser Sequential Step Diagonal Measurement

2018 ◽  
Author(s):  
Huimin Li ◽  
Sitong Xiang ◽  
Ming Deng ◽  
Mengrui Zhu ◽  
Zhengchun Du ◽  
...  
Keyword(s):  
Experimental Tests ◽  
Measuring Method ◽  
Geometric Errors ◽  
Machine Accuracy ◽  
Volumetric Error ◽  
Positioning Errors ◽  
Machining Center ◽  
Direct Measurements ◽  
Volumetric Errors ◽  
Squareness Errors

This paper proposes a bi-directional laser sequential step diagonal measuring method for three-axis vertical machining centers. Different measure paths are particularly designed for positive and negative directions, and corresponding error decoupling models are established. Based on the laser measuring data along these bi-directional paths, 18 geometric errors can be identified simultaneously, including 6 angular errors, 3 positioning errors, 6 straightness errors and 3 squareness errors. Compared with single directional step diagonal measurements, the proposed bi-directional mothed is more efficient and can identify more error items, namely 6 angular errors. Experimental tests were conducted on a three-axis vertical machining center. Decoupled error items obtained by the proposed bi-direction measurements coincide with those from direct measurements via a laser Doppler displacement meter, which verified the feasibility of the proposed method. Finally, the position error of the machine whole workspace was predicted by building volumetric error model and the machine accuracy was improved.

scholarly journals Simultaneous Measuring Method of Needle Thread Tension and Needle Thread Movement for Lockstitch Sewing Machine.

1998 ◽  
Vol 51 (6) ◽  
pp. T125-T130
Author(s):  
Yoshinobu Kamata ◽  
Toyofumi Kato ◽  
Takuya Oda ◽  
Katsuyuki Sakamoto ◽  
Yukihiro Ando ◽  
...  
Keyword(s):  
Measuring Method ◽  
Sewing Machine ◽  
Thread Tension ◽  
Simultaneous Measuring ◽  
Lockstitch Sewing ◽  
Needle Thread

The Research on the Orientation Error of Three-Axis Turntable in Theory and Measuring Method Based on Assembling

2006 ◽  
Vol 532-533 ◽  
pp. 849-852
Author(s):  
Yan Li ◽  
Da Peng Fan
Keyword(s):  
Machine Tool ◽  
Measuring Method ◽  
Error Model ◽  
Geometric Errors ◽  
Body System ◽  
Orientation Error ◽  
Nc Machine Tool ◽  
Nc Machine ◽  
Multi Body

Based on the analysis of geometric errors of mechanism assembling, this paper applies the multi-body system kinematics theory in building the orientation error model of three-axis turntable induced by assembling errors. The results using the model could be easily applied in controlling turntable by error’s compensation, and shows which assembling error item has the larger effect. Furthermore，referenced by the measuring means of three-axis turntable, this paper conceives the definitions of the volumetric and orientation accuracy aimed at the turntable system, enlightened from the conception of NC machine tool. This research may be helpful to the foundation of the systematic conception of the turntable accuracy no matter in theory or in measuring method.

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