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  • How Engineers Ultilized The CAD model

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    To continue our last post about 3D Scan Nandi – a sacred bull sculpture, this post will take a look at how second scanning session phase take place in (CAD Model) and final fabrication.

    The Researchers used a Handyscan 3D portable, self-positioning laser scanner to scan the final wax sculpture. The team exported the STL file in binary format using Creaform VxScan, then loaded the model into Rapidform 2006 and Geomagic 9.0 for processing and assembly. The data was converted into STL format using Geomagic and Rhinoceros and then into full-scale 2D drawings. The information was split into sections once it was loaded into Rhino. The various pieces were chopped into 100-mm layers for the finished sculpture’s 16-mm rebar frame (except the head, horns, and ears). Then, using 8′-wide vinyl printers, 2D designs were produced to scale from Rhino (1:1).

    The project team utilized the CAD model 

    Because the underside of the accurate model was not scanned, the CAD model was filled with post-processing software to make it waterproof. Then specific essential statistics, such as the bull’s surface area.

    Final Fabrication

    The team’s original intention was to cast the bull’s complete body, but they ran into challenges such as a lack of technical foundries in the area and a tight budget for the project. Furthermore, the head priest opted to use hand labor rather than mechanized machines to create the metal sculpture. To ensure high quality and long life for the holy bull, the team opted to have the head cast and the body made of mild sheet steel. The manufacturing team was able to stick to the original purpose stated in the wax model thanks to the 2D drawings and design generated with 3D scanning.

    The pieces were cut on a single plane (XY, YZ, or XZ) and prepared by hand to make production easier. The skeleton was built in sections, with 16-mm rebar rods set on a 50-mm L angle on the exterior edge and inside to reinforce the structure. The crew assembled all of the pieces before draping the 8-mm mild steel sheets onto the skeleton to ensure that they fit, which they did.

    CAD Model

    The most crucial component, however, was still lacking.

    The head was CNC-milled from polystyrene foam and then invest-cast in a place 500 kilometers from the temple site so that the characteristics precisely matched the CAD model. The pilot was made up of seven separate sections that were welded together and completed on-site. Supporting bars were utilized to compensate for the castings’ distortion or warping, and a 100-mm buffer zone was designed in front of the head and torso assembly. In February 2009, the temple’s Sadhguru blessed the sacred bull in front of 250,000 people. The temple’s objective of honoring its deities with a natural, long-lasting monument while also drawing more worshipers was achieved.

    CAD Model


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