Modelling and compensation of fixture locators’ error in CNC milling

Fallah, Meghdad; Arezoo, Behrooz

doi:10.1080/00207543.2013.774498

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…In order to increase the positioning accuracy of the 3-2-1 fixture system, several studies have been published in recent decades. The positioning and orientation errors of a workpiece have been modeled as a function of locators’ accuracy by Fallah and Arezoo 1 and Tang et al 2 In addition, Abedini et al, 3 Nasr et al 4 and Vasundara and Padmanaban 5 developed algorithms to determine the best position of locators and clamps to minimize workpiece positioning errors in machining. When machining a workpiece with narrow tolerances is desired, maintaining the workpiece in the same attachment without repositioning is advised.…”

Section: Introductionmentioning

confidence: 99%

A contribution for increasing workpiece location accuracy in a 3-2-1 fixture system

Filho

Medeiros

Cardoso

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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The 3-2-1 fixture design principle is the most used method to locate prismatic workpieces. To further increase location accuracy, the influence of friction and contact stiffness between workpiece and fixture parts should be minimized. This can be achieved by decreasing the structural stiffness of the locators in the tangential direction to the contact. Hence, based on flexure hinges, locators with two different stiffness values are investigated. To analyze the influence of locator stiffness, a special experimental setup is developed to study two locators positioned in the secondary plane of the 3-2-1 fixture. Experiments are carried out to compare the locators with flexure hinges to a rigid one. The displacement and rotation of the workpiece are investigated as a function of the clamping force. The experimental results show that the reduction in the tangential stiffness can improve the position and orientation accuracy of workpieces.

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