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TECHNOLOGY 39
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Reverse engineering of this part was performed using After that, a manufactured tool die was used to reproduce
Geomagic DesignX software. The whole part is manufactured the same part on a large scale. The entire reverse engineering
from the same diameter pipes, enabling an easy reverse is presented. This project was carried out in cooperation with
engineering process. the Wood Team d.o.o (Ilija, Bosnia and Herzegovina). As in case

The extrusion wizard command was used. This command study No. 2, the scanning time, scanning processing, and 3D
allows the user to select some part of the data from the scanned modelling (reverse engineering) took around one hour each.
STL model, and the command automatically recognises the
shape of the selected data and approximates its dimensions. Case Study No. 4
In this case, the command recognises that a cylinder is The fourth example shows the necessity of developing and
the best approximation for these data. In the second step, designing a new table support part using an old design in
this cylinder was extruded to the end of the pipes. the Austro-Hungarian style. The old defective part was 3D
This process was repeated for all parts. In the third step, scanned; scanned data were then used to produce a new
the created extrusions of all pipes are cut and joined to form part. This example has more complex shapes and surfaces,

one part. After creating an ideal CAD 3D model, this product so scanning and scan processing take around two hour. In this
is reproduced using traditional pipe cutting and welding case, 3D modelling was not performed because this product
processes at the Standard Furniture Factory (Ilija, Bosnia will be reproduced by using sand casting.
and Herzegovina). If the sand-casting manufacturing method is used, the
The analysis of dimensional accuracy for this case study surface quality of the 3D model does not need to be in
is shown. It can be noticed that all deviations of the created the form of an ideal CAD model; the STL file can be used.
CAD model compared to the 3D scanned point cloud are Furthermore, superior surface quality is not necessary for this

around one mm, except for the left rear leg. type of furniture.
This deviation results from errors during the 3D scanning This 3D model can be used as an STL file. A missing leg
process, and the scanner does not detect the surface of the can be easily added inside Artec Studio software using the
real part due to errors during the 3D scanning. scanned leg as a reference.
There was a hole in the point cloud in this area. The Additionally, only one leg can be 3D printed and used
software automatically filled this hole. This was not a problem for sand casting tool manufacturing. It is better to print only
for future processing of the part because, for 3D modelling one leg due to the material serving for 3D printing. This case
purposes, the right rear leg was used and then mirrored to study is an excellent example of how additive manufacturing
the left side. It can be seen that this part is symmetric from
Jakarta Parquet
the left to the right.

Case Study No. 3
The phases of the third case study are presented. In this case,
it was also necessary to reproduce the already manufactured
part sent by the client without any technical documentation.
The first step was to 3D scan to create 3D CAD models.

The CAD models were then used for tool die manufacturing
using the robot hand.