Report about the 3D digitisation of a steam engine housing

For the proof of dimensional stability against the CAD model it is necessary to scan the inside as complete as possible and to scan the outside at relevant areas. A sufficient coverage is achieved with a total of 7 scans: One front scan (Figure 1, pos. 3), two scans from underneath and 4 horizontal scans at the corner positions (pos. 4-7).

Figure 1: The top view shows the 7 scan positions. The positions 1-3 are from underneath to scan the internal surface.

 

Figure 2: Housing half with Surphaser underneath (at scan position 1 of 7).

10 contrast targets are distributed in the scan volume for the referenzing of the scans against each other. Figure 3 (animation) shows the outside scan images with the automatically extracted target positions.

The scans are automatically referenced in the post processing software.

Figure 3: Some scan data images with referencing targets.

Summary
• Scanner • Number of scans: • Scan time: • Objekt size • 3D points: • point density: • Referen cing accuracy: • Post processing:	Surphaser HSX100-SR 7 2 hours 5x6x4m 90 millions 1mm 0.1mm RMS 15 minutes calculation time for the fully automatic referencing.

Courtesy of Siemens AG / Muehlheim.

 Figure 4: Animation of the merged point cloud. (Visualized are only 10% of the data set)