Event Title

Comparison of Parametric Curves in Reverse

Location

Hager-Lubbers Exhibition Hall

Start Date

15-4-2015 3:30 PM

Description

A test component was reverse engineered by using Bezier and Hermite curves. This project focused on digitizing geometric information and developing a CAD model of the test component by measuring points on the surface of the component. The process involved four steps. First, coordinate data was collected for control points using contact method. A scriber attached to a three axes coordinate displaying milling machine was used to get the spatial coordinates of the control points. Secondly, with the measurement data, the parametric curves were generated using an iterative procedure in a MATLAB program. Thirdly, the 3-D surface models were generated by lofting these curves in SolidWorks. Lastly, the models were analyzed to address issues in modeling, respective limitations and sensitivities for both the curves. In order to examine the modeling accuracy, prototypes were created using 3-D printers. Random measurements of dimensions using Vernier calipers and volumetric analysis with water displacement method were deployed to compare the 3-D printed parts to the original test component. Based on the results, the model extracted using Hermite curve showed better accuracy to the test piece than the model from Bezier curve and recommended for reverse engineering such parts.

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Apr 15th, 3:30 PM

Comparison of Parametric Curves in Reverse

Hager-Lubbers Exhibition Hall

A test component was reverse engineered by using Bezier and Hermite curves. This project focused on digitizing geometric information and developing a CAD model of the test component by measuring points on the surface of the component. The process involved four steps. First, coordinate data was collected for control points using contact method. A scriber attached to a three axes coordinate displaying milling machine was used to get the spatial coordinates of the control points. Secondly, with the measurement data, the parametric curves were generated using an iterative procedure in a MATLAB program. Thirdly, the 3-D surface models were generated by lofting these curves in SolidWorks. Lastly, the models were analyzed to address issues in modeling, respective limitations and sensitivities for both the curves. In order to examine the modeling accuracy, prototypes were created using 3-D printers. Random measurements of dimensions using Vernier calipers and volumetric analysis with water displacement method were deployed to compare the 3-D printed parts to the original test component. Based on the results, the model extracted using Hermite curve showed better accuracy to the test piece than the model from Bezier curve and recommended for reverse engineering such parts.