4.4 Sea-horse - Industrial

4.4.1 Background
 
 

Resource Recovery Systems (Pty.) LTD, specializing in electro-forming presented a nickel plated sea-horse. This was made from an original sea horse. The focus of this case study was to capture the geometry from actual specimen, a sea horse, and use it in the jewelry industry.

The CSIR’s high resolution Phillips CAT scanner was used. The sea horse was fitted in the rotary table, secured with prestik putty. CAT images were taken 0,2mm thick and 0,2mm intersections. This data was stored on the UNIX based computer.

Please refer to section 3.7.1.2 for more detail regarding data retrieving and apparatus.
 
 

4.4.2 Conclusion
 
 

This is again the ideal method for capturing detailed, complex and low accuracy geometry. This small specimen needed to be scanned at a minimum of 0,2mm slice and intersections to capture the geometry. The 486 UNIX based computer needs to be upgraded to accommodate larger sets of data storage and processing. It therefore requires larger hard drive, RAM capacity as well as a faster processor. CAT scanning can be done overnight if properly planned.

Only sets of maximum 16 images could be converted simultaneously. The FDM rapid prototyping machines produced the scaled up 2:1 version of the head.
 
 
 
 

4.4.2.1 Images
 
 
 
Figure 4.4.2.1

3D reconstruction of the Sea Horse.
 
 
 
 

 

Figure 4.4.2.2 

3D reconstruction of the Sea Horse.


 
 
 
 
 
 
 
 
 
 

Figure 4.4.2.3

3D reconstruction of the Sea Horse.

Figure 4.4.2.4

FDM Prototype of the Sea Horse, scale 2:1.


 
 

4.4.3 Sea-horse Data Sheet:
 
 
  Description Options (Default) Data

 

1 CT Image Names   shorse_1.01
2 Patient/Project Name   seahorse.pat
3 Number of First Input Image   seahorse00
4 Number of Last Input Image   seahorse85
5 Number of First Output Image   000
6 CT or MRI CT, MRI CT
7 Horisontal Nr. Of Image Pixels 0 to 65535 (265,512,1024) 512
8 Vertical Nr. Of Image Pixels 0 to 65535 (265,512,1024) 512
9 Number of Images per File (1) 1
10 File Swap Format (0,3) 0,3 3,CCUNF
11 Pixel Type B,UB,S,US,L,UL,F US
12 Header Size *see formula below 0
13 Inter Image Header Size 0 0
14 Add Value 0 to 4095 DEFAULT
15 Scale Value 0 to 4095 DEFAULT
16 Table Position (mm) 30.2
17 Distance Between Slices (mm) 0.2
18 Slice thickness (mm) 0.2
19 Pixel Size SQ. F.O.R./Nr. Hor. Pixels (mm) 0.078125
20 Gantry Tilt Angle Degrees 0
21 Field of Reconstruction/View (mm) 40
22 Number of Images   85
23 File Size of CAT Image kb 315
24 File Size of Converted Image kb 265
25 .3dd file size Mb 0.198
26 .STL file size Mb 14.31
27 RP Method (SLA,FDM,OTHER) SLA
28 .IGS file size Mb -
29 RP Slice file size Mb 12
30 RP Download File size Mb 13
31 Grow Time Hour 4
32 Tip size (T12, T25) T12
33 Slice Thickness (0.01", 0.014") 0.01"
34 Finishing Time Hour 1
35 Processing Time Hour 5
36 Data Retrieval Time Hour 6
37 Total Cost Rand =11*150+

=1650


 

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