Workpiece locating error prediction and compensation in fixtures

Shaowei Zhu, Guofu Ding*, Shuwen Ma, Kaiyin Yan, Sheng-feng Qin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


In machining process, fixture is used to keep the position and orientation of a workpiece with respect to machine tool frame. However, the workpiece always cannot be at its ideal position because of the setup error and geometric inaccuracy of the locators, clamping force, cutting force, and so on. It is necessary to predict and control the workpiece locating error which will result in machining error of parts. This paper presents a prediction model of a workpiece locating error caused by the setup error and geometric inaccuracy of locaters for the fixtures with one locating surface and two locating pins. Error parameters along 6 degrees of freedom can be calculated by the proposed model and then compensated by either using the “frame transformation” function of a numerical control (NC) system or modifying NC codes in post-processing. In addition, machining error caused by the workpiece locating error can be predicted based on a multi-body system and homogeneous transfer matrix. This is meaningful to fixture design and machining process planning. Finally, a cutting test has shown that the proposed method is practicable and effective.
Original languageEnglish
Pages (from-to)1423-1432
Number of pages10
JournalInternational Journal of Advanced Manufacturing Technology
Issue number5-8
Early online date6 Nov 2012
Publication statusPublished - 1 Jul 2013


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