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Technical Briefs

Improving Chucking Accuracy and Repeatability by Reducing Kinematic Redundancy

[+] Author and Article Information
Jeongmin Byun

Department of Mechanical and Manufacturing Engineering, St. Cloud State University, 720 4th Avenue South, St. Cloud, MN 56301-4498jbyun@stcloudstate.edu

C. R. Liu

School of Industrial Engineering, Purdue University, 315 N. Grant Street, West Lafayette, IN 47907–2023cliu@purdue.edu

J. Manuf. Sci. Eng 132(6), 064501 (Oct 14, 2010) (5 pages) doi:10.1115/1.4002186 History: Received December 02, 2008; Revised June 27, 2010; Published October 14, 2010; Online October 14, 2010

In this paper, the effect of kinematic redundancy on chucking, especially, on the positioning accuracy of a cylindrical workpiece was investigated. No previous research on the effect of kinematic redundancy on the positioning accuracy and the repeatability of a workpiece in chucking has been reported, even if kinematic principle has been known for a long time. Starting from the description of the issues, a series of systematic experiments was carried out. It was demonstrated that the nonrepeatability and the chucking error proportionally increase as the kinematic redundancy increases. Also, it was shown that kinematic redundancy had a significant effect on the positioning accuracy of chucked workpieces, especially the workpieces with a relatively higher length/diameter ratio. The contact area between the workpiece and the jaws was reduced to the extent, which does not hurt the chucking rigidity and the safety to reduce kinematic redundancy. It was shown that the concentricity of the workpieces was improved as much as ten times by just minimizing the kinematic redundancy in the finish hard turning of the rings of a taper roller bearing.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Definition of parameters in chucking

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Figure 2

Illustrations on the effect of kinematic redundancy on positioning repeatability of a workpiece in chucking

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Figure 3

Experimental setup for error measurements

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Figure 4

The relation between area of contact and the eccentricity of a chucked workpiece

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Figure 5

The relation between standard deviation of eccentricity in chucking and the contact area in a jaw

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Figure 6

The reduction results of chucking error by step-by-step approach for workpiece type I (OD surface as a major locating surface; length to diameter ratio 0.8, average weight 15.5 kg)

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