Researcher:
Isa, Mohammed A.

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Mohammed A.

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Isa

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Isa, Mohammed A.
Isa, Mohammed Adamu

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2017 - 20204

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Researcher Of Publications: search.filters.isAuthorOfPublication.a986127b-e033-4c37-b357-4bf5f2028f94

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    Design and analysis of a 3D laser scanner
    (Elsevier Sci Ltd, 2017) N/A; Department of Mechanical Engineering; Department of Mechanical Engineering; Isa, Mohammed A.; Lazoğlu, İsmail; Researcher; Faculty Member; Department of Mechanical Engineering; Manufacturing and Automation Research Center (MARC); College of Engineering; College of Engineering; N/A; 179391
    A new laser scanner is designed, built and its scan measurement uncertainty is analyzed and deviations are minimized. The design is comprised of the physical setup of scanner, point cloud extraction as well as procedures for scanner calibration. It is designed to operate in a spherical domain, thereby giving wide imaging view possibilities. By exploiting strategies in real-time serial communication and image processing, the prototype acquires uniformly dense point cloud from a geometric specimen. In addition to design, rather than using benchmark geometry to only assess the accuracy of the scanner, data obtained from a known geometric model are used to modify the scanner parameters to obtain optimal results. A method of finding scanner parameters that provides least point deviations is developed using least squares. The methods of calibration and optimization of the scanner prototype in this paper can be extended to any type of scanner design.
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    Additive manufacturing with modular support structures
    (The University of Texas at Austin, 2020) Department of Mechanical Engineering; Department of Mechanical Engineering; N/A; Lazoğlu, İsmail; Isa, Mohammed A.; Yiğit, İsmail Enes; Faculty Member; Researcher; Phd Student; Department of Mechanical Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; 179391; N/A; N/A
    Additive manufacturing is praised to have low material waste compared to conventional subtractive manufacturing methods. This is not always the case when the computer aided design (CAD) model consists of large overhangs. In such cases, fabrication of support structures are required to fill the space between the CAD model and the manufacturing bed. In post processing, these support structures must be removed from the model. These supports become waste and reduce the buy-to-fly ratio. In this paper, we present a pre-fabricated reusable modular support structure system which minimizes the fabrication of conventional support structures. The conventional supports are replaced with modular support blocks wherever possible. The blocks are stacked under the overhang with a robot arm until the overhang of the model is reached. Conventional supports can be fabricated on top when needed with fused filament fabrication. This strategy reduces fabrication of conventional supports. Thus, faster fabrication times are obtained with higher buy-to-fly ratios.
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    Analysis of build direction in deposition-based additive manufacturing of overhang structures
    (The University of Texas at Austin, 2020) Department of Mechanical Engineering; Department of Mechanical Engineering; N/A; Lazoğlu, İsmail; Isa, Mohammed A.; Yiğit, İsmail Enes; Faculty Member; Researcher; Phd Student; Department of Mechanical Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; 179391; N/A; N/A
    Additive manufacturing (AM) has gained repute as a direct method of fabrication of complex parts. However, the requirement for each layer to be structurally supported can make parts with overhangs hard to produce without alterations to the parts. This work proposes using multi-axis additive manufacturing to fabricate and analyze freeform overhangs such as bridge structures. Multi-axis AM allows reorientation of the build direction so that overhangs can be 3D printed. Consequently, decision on the build orientation is necessary and its result should be analyzed. The effect of the AM build direction with respect to the overhang's local surface directions will be studied. A Rhinoceros® plugin is designed to generate the path of the multi-axis AM for the unsupported components like roofs, bridges and protrusions. The effects of the build direction on the surface quality and deformation of the components are studied.
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    Five-axis additive manufacturing of freeform models through buildup of transition layers
    (Elsevier Sci Ltd, 2019) N/A; Department of Mechanical Engineering; Department of Mechanical Engineering; Isa, Mohammed A.; Lazoğlu, İsmail; Researcher; Faculty Member; Department of Mechanical Engineering; Manufacturing and Automation Research Center (MARC); College of Engineering; College of Engineering; N/A; 179391
    Acclaimed for enabling the fabrication of complex parts, additive manufacturing is confined to established processing and planning methods that contribute impediments to its industrial adoption. The requirement of support structures and poor quality of produced surfaces are some of these impediments. Extension of the manufacturing method to accommodate variable tool orientation can introduce new approaches in process planning that can resolve these obstacles. Therefore, a new 5-axis 3D printer is designed, built and programmed to facilitate implementation of novel 3D curve paths. Common layering methods in additive manufacturing are centered around the idea of intersection of a CAD model with parallel planes or offset surfaces without regards to the form of the part. The use of these inflexible layering patterns leads to staircase effect on the surfaces, inefficient toolpaths and low load-bearing capacity. This article suggests and develops new 5-axis path planning model that takes into account the surface profiles of the freeform part. Path and tool orientation conditions are reexamined to propose planning schemes that prevent staircase effects on shell and solid components. To accomplish this, the material is deposited on successive transition surfaces whose infra-layer thickness varies to allow changes in the form of the surfaces.