Conventional Additive Manufacturing (AM) technologies are layer based with linear motions in three Cartesian axes. These techniques have limitations in the form of poor part accuracy at angles oblique to the build direction, slower build speed and additional support structure requirement. The limitation of build direction results in poor surface finish due to aliasing (or layer stair- stepping) and adverse material properties in certain directions. Various solutions were developed in the past to address these issues that resulted into increased build time and adversely affected the machine autonomy. These drawbacks limit the capabilities of the AM process with respect to other manufacturing processes. The present study proposes the use of multidirectional AM to address some of these issues by allowing 6-axis motion between tool and base for FDM process. One such popular architecture namely, the Stewart-Gough platform (SGP) is explored in detail and its capability as a viable platform for FDM is illustrated. The design of SGP for multidirectional FDM is realized by formulating it as an optimization problem. The details of the optimization formulation and the consequent results are discussed at length. The proposed design of the multidirectional AM will not only minimize post-processing requirements but also allow for faster build-up of the part. Additionally, it is expected to offer advantages such as building around inserts, simplified slicing mechanism and control of isotropic material properties.

Supervisors-  Dr. K A Desai,  Dr. S V Shah

Shricharana Shastry, Ritwik Avaneesh, K A Desai, S V Shah, “Optimal Design of a Stewart-Gough Platform for Multi-Directional Additive Manufacturing “, 6th International & 27th All India Manufacturing Technology, Design and Research Conference (AIMTDR-2016), (Download PDF)

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