Results 201 to 210 of about 205,324 (238)

The South African Rugby Injury and Illness Surveillance and Prevention Project (SARIISPP): SARU Boys' Youth Week Injury Surveillance Report, 2024. [PDF]

S Afr J Sports Med
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Robot accuracy evaluation using a ball-bar link system

Robotica, 2011
SUMMARYRelatively large errors can exist in industrial robots as a result of mismatch between the controller model and the corresponding physical model. The paper outlines a novel approach for accuracy assessment and adjustment of multiaxis industrial robots through a low-cost ball-bar link system.
Y. Oh
semanticscholar   +4 more sources

Application of Ball Bar System and Genetic Algorithms for CNC Lathe Contouring Compensation

The International Journal of Advanced Manufacturing Technology, 2001
There is considerable interest in the development and improvement of contouring test devices for CNC machines. When ball bar systems are employed to test CNC lathes, the eccentricity cannot be determined accurately from the sampled quadrant contouring data via the least-squares method.
Wen-Yuh Jywe, Chien-Hong Liu
semanticscholar   +4 more sources

Kinematic Calibration of the 3-DOF Module of a 5-DOF Reconfigurable Hybrid Robot using a Double-Ball-Bar System

2006 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2006
This paper deals with the kinematic calibration of a 3-DOF parallel mechanism using a Double-Ball-Bar (DBB) system. The mechanism forms the main body of a 5-DOF reconfigurable hybrid robot named TriVariant that is a modified version of the Tricept, achieved by integrating one of its three active limbs into the passive one. The first order error mapping
Tian Huang, Z. Y. Hong, Jiangping Mei, Derek G. Chetwynd   +3 more
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Calibration of double ball bar (DBB) system

SPIE Proceedings, 2009
A double ball bar (DBB) system is an imperative device for measuring contouring accuracy, error characterization and interpretation of machine tool performance in volumetric workspace. The advantage that makes it popular and widely used by machine users is its quick performance checking, easy to use, portability and minimizing the down time of machine ...
Abdul Wahid Khan, Fei Liu, Wuyi Chen
openaire   +2 more sources

Ball-bar based self-calibration technique for five-axis optical measurement system

SPIE Proceedings, 2012
This paper presents a ball-bar based self-calibration technique for a five-axis point laser optical measurement system. The system is composed of a high accuracy laser point sensor and five motion stages X, Y, Z, B, C. A kinematical system model of the 5-axis measurement system is presented to map the stages and sensor readouts to the target position
X. M. Du, Jiajun Gu, K. G. Harding
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The Development of a Triple Ball Bar System for Calibration of CNC Machine Tools

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2006
The accuracy of machine tools restricts the dimensional accuracy of parts processed thereon. It is, therefore, necessary to monitor the errors of machine tools constantly. Normally, it takes a long set-up time before one can observe the machine tool and monitor its errors. The cost of such delays is inevitably high.
Wenyuh Jywe, Chien Hung Liu, Bor Jeng Lin, Tung Hui Hsu   +3 more
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Properties of free-standing ball bar systems

Precision Engineering, 1993
Abstract This article offers recommendations to coordinate-measuring machine (CMM) buyers, sellers, and users on the design of free-standing ball bar systems used to evaluate the volumetric performance of CMMs according to the ANSI/ASME B89.1.12M standard. These systems are more widely used today than earlier methods such as magnetic ball bars.
S.D. Phillips, B. Borchardt, T. Doiron, J. Henry   +3 more
openaire   +3 more sources