Evaluation of geometrical benchmark artifacts containing multiple overhang lengths fabricated using material extrusion technique

Siti Nur Humaira Mazlan; Aini Zuhra Abdul Kadir; N. H. A. Ngadiman; M.R. Alkahari

doi:10.15282/jmes.14.3.2020.28.0573

Authors

Siti Nur Humaira Mazlan School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia. Phone: +6075534564; Fax: +6075566159
Aini Zuhra Abdul Kadir School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia. Phone: +6075534564; Fax: +6075566159
N. H. A. Ngadiman School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia. Phone: +6075534564; Fax: +6075566159
M.R. Alkahari Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 71600 Durian Tunggal, Melaka, Malaysia

DOI:

https://doi.org/10.15282/jmes.14.3.2020.28.0573

Keywords:

Multiple length overhang, geometrical benchmark, fused deposition modeling, dimensional accuracy, laser scanning

Abstract

Fused deposition modelling (FDM) is a process of joining materials based on material entrusion technique to produce objects from 3D model using layer-by-layer technique as opposed to subtractive manufacturing. However, many challenges arise in the FDM-printed part such as warping, first layer problem and elephant food that was led to an error in dimensional accuracy of the printed parts especially for the overhanging parts. Hence, in order to investigate the manufacturability of the FDM printed part, various geometrical and manufacturing features were developed using the benchmarking artifacts. Therefore, in this study, new benchmarking artifacts containing multiple overhang lengths were proposed. After the benchmarking artifacts were developed, each of the features were inspected using 3D laser scanner to measure the dimensional accuracy and tolerances. Based on 3D scanned parts, 80% of the fabricated parts were fabricated within ±0.5 mm of dimensional accuracy as compared with the CAD data. In addition, the multiple overhang lengths were also successfully fabricated with a very significant of filament sagging observed.

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