Revopoint Ball-Plate 1.5m Tracking Ring
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Tracking Ring to increase the marker tracking distance to 1,5m with the Revopoint ball plate
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Finally had the time and opportunity to improve my accuracy testing methodology for 3d scanners. The previous approach of using a micrometer for testing created quite some discussions about the topic and for myself it was clear that using a proper ball bar or ball plate would be a much better approach. Sadly due to the fact that price of ball bars scales with size I had to get a bit creative to make the most of the 100mm ball plate I have (thanks to Revopoint for supporting my independent testing by providing the ball plate). Before anyone complains: the ball plate doesn't magically create more accurate results for Revopoint scanners.
What I came up with is following: around the ball plate a 3d printed ring with markers is placed so that tracking works by starting with the first sphere, scanning the whole ring (roughly 1.5m of tracking distance) and then scanning the second sphere. To ensure no markers are captured for both spheres simultaneously a plate is added between the spheres to shield both sides against each other.
This setup allows me three testing modes:
- 100mm tracking by directly scanning the ball plate
- 1500mm tracking with the tracking ring
- 1500mm tracking with the tracking ring using global markers
Printing
Printed mine from PETG, orientation as in the STLs. Add markers in irregular pattern to the ring. Plate holder is designed fto fit regular print plates.