Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 56 11 2025 01 20 Numerical and Experimental Analysis of Locating Error of a Polyhedral Workpiece in the Fixture Numerical and Experimental Analysis of Locating Error of a Polyhedral Workpiece in the Fixture 1555 1574 5701 10.22060/mej.2025.23625.7792 FA Iman Rashidi M.Sc., Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran Hadi Parvaz صنعتی شاهرود-مهندسی مکانیک 0000-0003-4806-7311 Mehdi Bahrami B.Sc., Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran Sattar Hazrati M.Sc., Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran Journal Article 2024 10 28 <span style="letter-spacing: .05pt;">Any change in position of the fixture components can lead to deviations in the workpiece's position and orientation, resulting in a defective product. This study suggests a numerical and experimental approach to calculate the positioning error of the workpiece in the fixture. Initially, the linear and angular components of the workpiece deviation due to disturbances in the locators were calculated using numerical modeling in Abaqus software. An experimental setup was fabricated to validate the numerical results. The experimental tests were conducted to measure the linear and angular components of workpiece deviations. The experiments were performed in two conditions: with and without clamping force, with each experiment repeated three times. Also, the effects of applying clamping force and disturbances to the workpiece and locators were studied on the results. In the first series of tests, the workpiece was positioned in a fully horizontal position and clamping forces of 100, 150, 200, 250, 350, and 500 N were applied. In the second, disturbances were also applied to the locators along with the clamping force. In both procedures, the displacement of a reference point, resulting from deformation and deviation of the workpiece, was measured and compared with the numerical predictions. The analysis of all results revealed that the maximum errors between the numerical and experimental results for the disturbed and non-disturbed conditions were equal to 9.1% and 14.9%, respectively.</span> <span style="letter-spacing: .05pt;">Any change in position of the fixture components can lead to deviations in the workpiece's position and orientation, resulting in a defective product. This study suggests a numerical and experimental approach to calculate the positioning error of the workpiece in the fixture. Initially, the linear and angular components of the workpiece deviation due to disturbances in the locators were calculated using numerical modeling in Abaqus software. An experimental setup was fabricated to validate the numerical results. The experimental tests were conducted to measure the linear and angular components of workpiece deviations. The experiments were performed in two conditions: with and without clamping force, with each experiment repeated three times. Also, the effects of applying clamping force and disturbances to the workpiece and locators were studied on the results. In the first series of tests, the workpiece was positioned in a fully horizontal position and clamping forces of 100, 150, 200, 250, 350, and 500 N were applied. In the second, disturbances were also applied to the locators along with the clamping force. In both procedures, the displacement of a reference point, resulting from deformation and deviation of the workpiece, was measured and compared with the numerical predictions. The analysis of all results revealed that the maximum errors between the numerical and experimental results for the disturbed and non-disturbed conditions were equal to 9.1% and 14.9%, respectively.</span> https://mej.aut.ac.ir/article_5701_bac49b876d5dfc9cd169c22ef5178ca7.pdf