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Appl. Sci. 2018, 8(2), 169;

An Analysis of Angular Indexing Error of a Gear Measuring Machine

Key Laboratory for Precision and Non-traditional Machining of Ministry of Education, Dalian University of Technology, Dalian 116023, China
Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan
Author to whom correspondence should be addressed.
Received: 1 November 2017 / Revised: 16 January 2018 / Accepted: 22 January 2018 / Published: 25 January 2018
(This article belongs to the Section Mechanical Engineering)
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In gear measuring machines (GMMs), the tested gear is mounted on a mandrel, which is pivoted at both ends by two centers in a vertical arrangement. The upper center is fixed and the lower center is driven by the spindle of rotation. The coaxiality error between the central line of the mandrel and the spindle average line of a GMM always exists in terms of the offset and angle measured in one plane. Such a coaxiality error would cause an angular indexing error of tested gear resulting in measurement error. This phenomenon has rarely been investigated. In this paper, a GMM is taken as an example and its coaxiality error of the mandrel and spindle error of the rotary stage are measured. The difference of rotated angles between the mandrel and spindle is theoretically analyzed by derived formulae. Calibrated by a precision polygon and an autocollimator, the predicted angular index error of the mandrel was consistent with experimental results. Through the experimental verification, it was found that, when the coaxial deviation between the two centers was 10 μm and the lower center tip’s radial motion error was 1.6 μm, the angular indexing deviation of the mandrel was ±5″. If the errors were compensated according to the analyzed model, the residual error was reduced to ±2″. A significant improvement in the angular positioning accuracy of the GMM can be achieved. View Full-Text
Keywords: angular indexing error; gear measurement; coaxiality error; positioning of centers; error compensation angular indexing error; gear measurement; coaxiality error; positioning of centers; error compensation

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Lou, Z.-F.; Xue, P.-F.; Zheng, Y.-S.; Fan, K.-C. An Analysis of Angular Indexing Error of a Gear Measuring Machine. Appl. Sci. 2018, 8, 169.

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