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The South African Rugby Injury and Illness Surveillance and Prevention Project (SARIISPP): SARU Girls' Youth Week Injury Surveillance Report 2023. [PDF]
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Analysis of eccentricity in the ball bar measurement
Journal of Mechanical Science and Technology, 2010The ball bar is widely used in machine tool measurement because it is convenient and cost effective. Eccentricity exists due to machine errors and installation errors during a ball bar test, and the coordinate transformation method is used to remove eccentricity.
Seung-Han Yang +2 more
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An extensible ball bar for evaluation of robots' positioning performance
Journal of Robotic Systems, 1987AbstractThis article describes the development of a one‐dimensional extensible ball bar designed to measure the positioning accuracy and repeatability of industrial robots. The ball bar has a linear travel of 5 cm (2 in) that is monitored by a built‐in electronic transducer having a resolution of 2.5 μm (0.0001 in).
Naren Vira, K. Lau
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Evaluation of Ball-Bar Static Errors
1995This paper examines the static mechanical measurement errors of telescoping ball-bar systems used for the contouring assessment of a wide range of CNC machine tools. Several commercial systems were evaluated and a description of each system is given along with details of the various static tests that were conducted.
K. Dalby, M. Gull
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Calibration of double ball bar (DBB) system
SPIE Proceedings, 2009A 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
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Effects of lifter bars on the ball motion and aluminum foil milling in tumbler ball mill
Materials Letters, 2002Effects of lifter bars on the ball motion during ball milling and characteristics of aluminum flake powders prepared by the ball milling of aluminum foil scraps were studied. When rotation speed of milling jar without lifter bar is below 75% of critical revolutions per minute (rpm), balls slide in the jar.
Seong-Hyeon Hong, Byoung-Kee Kim
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A Spatial Four-Bar Linkage RSPS for Ball-Bar to Test R-pair
2017A novel mechanism model of RSPS is firstly presented in the paper for testing the rotational ac-curacy of an actual R-pair, which is new in the literature. The spatial four-bar linkage RSPS is comprised of a ball-bar with three kinematic pairs S-P-S and an actual R-pair measured. The outputs of RSPS corresponds to the distance between two master balls’
Delun Wang +4 more
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Telescopic ball bar with an indexing joint for measuring machine tool error
Measurement Science and Technology, 2022Abstract Measurement and compensation of these errors can improve the machining accuracy of a machine tool. Double ball bar is one of the traditional instruments for measuring machine tool errors, whose measurement range depends on the length of the bar since the sensor has a stretching range of only 2 mm.
Wen Wang +9 more
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Robot accuracy evaluation using a ball-bar link system
Robotica, 2011SUMMARYRelatively 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.
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Räumliche Referenzierung an Werkzeugmaschinen mit dem Double-Ball-Bar
Zeitschrift für wirtschaftlichen Fabrikbetrieb, 2008Kurzfassung Die Reduzierung unproduktiver Nebenzeiten ist vor dem Hintergrund einer zunehmenden Individualisierung der Produkte entscheidend für eine wirtschaftliche Fertigung. Enorme Potenziale dafür liegen beispielsweise im Referenzieren von Werkstücken, Werkzeugen und Zusatzeinrichtungen im Arbeitsraum einer Maschine.
Knut Großmann, Bernd Kauschinger
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