| 1 | A solid CAD model is converted to an STL (stereolithography)
file and sent to an RP service bureau for quote and subsequent
build. The service bureau imports the STL into its RP software
and properly orients it to use the superior surface finish of
the positive z-axis. The service bureau may group this STL with
others to maximize machine use. |
| |
| 2 | The service bureau may core out or honeycomb large
solid areas, add supports for overhanging areas, and add vent
holes and other elements as necessary. |
| |
| 3 | The RP program sections the STL file in the z-axis
into slices about 0.005" thick. When the build starts in the
SLA machine, the platen is at the maximum z-height. A laser
traces the first section. To accomplish quicker, more accurate
outlining and quick filling of each section, some machines now
vary the diameter of their laser beams from about 0.005"—0.030".
|
| |
| 4 | The machine lowers the platen about 0.005" . A
wiper passes over the surface of the liquid to break the surface
tension and ensure a smooth, even surface for the next section. |
| |
| 5 | The laser traces the next section. The machine
repeats steps 4 and 5 until all sections are built. |
| |
| 6 | The machine attendant raises the platen, drains,
wipes, and rinses the part as necessary, and may perform a final
cure with UV light. |
| |
| 7 | The attendant removes the part from the platen
and begins the finishing process by removing support structures
from the part. |
| |
| 8 | Hand-finishing of the part is generally necessary.
The level of finishing (as built, lightly sanded, paint ready,
polished, etc.) will depend on its intended use. |
|
| A concept for a desktop stereo developed by
Volan Design LLC for Dataplay Inc.'s CES debut. Left. CAD model
of the assembly. Center. The STL output with a detailed view
of a triangulated corner. Right. Finished prototype. |
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