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TOPIC: Dimensional accuracy test

Dimensional accuracy test 2 years 11 months ago #104

  • SIAB_Gabriele
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Hi everybody!

We want to thank the user “lucadibe” for pointing out in this post some dimensional differences between the 3d models generated with the software IDEA and the real objects.

Following this post, in the last few days, we made some tests.
Here are the results.

INTRODUCTION:
Used Tools:
- test artefact
- Scan in a box
- IDEA the Software: Scan in a Box proprietary software
- GEOMAGIC CONTROL 2015: professional software used for quality checking.

EXECUTION
The object used for this quality check is a demo artefact (IMG1) of the company 3d System. As it is used for the demonstrations of the quality check, we had its nominal values.
In order to achieve an accurate control, we decided to exploit the four holes of the object, creating four circumferences and measuring the interdistance between their centres.

Object dimensions: ~20cm
Field of View: 150mm
Used Geometrical features: the four holes interdistances.

The following steps are the same of a regular 3d scanning:
- Calibration [IMG2]
- Object scanning, followed by range images alignment and global alignment [IMG3]. 3D model generation and following exportatiton in .stl file format.

As mentioned before, the quality check was carried out with the software GEOMAGIC CONTROL.
After the preparatory operations (object alignment to the world, geometrical features fitting etc. IMG4) we compared the scan 3D model quotes to the object known values.

Result: attached to this post “GEO_part_20160219”

CONCLUSION:

The result matches the stated precision (up to 0,1% of the object dimension) and the quote that moves away from the nominal value is maximum 0,08% smaller.
Attachments:
Last Edit: 2 years 11 months ago by SIAB_Andrea.
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