# SpiROSE: how about the mechanics?

This week was full of requirement definitions. How many leds do we put, what bandwidth can we expect between the computer and the display, what technology can we use for [insert stuff here]… Lots of them have been defined, and more than 70 PSSC (Project Specific Success Criteria) have been written. During this time, mechanical drawings have been done to try different mechanical layouts.

The system is based on a main layout : a big squared block makes the fixed part of the system. A big plexiglass© cylinder with a top roof is put
over the block. Inside the fixed cylinder is the rotative part of the display. There have been multiple rotative versions. The idea is to make
something that can infer no occlusion while it’s turning. The induced problems are:
– The PCBs must be fixed without inducing occlusion (when turning)
– The layout of the system where the PCBs are going to be fixed shall not induce occlusion when turning.
– This system must resist without wobbling and have an intertia momentum small enough to respect our security criteria.

Example of full design with triangular rotary mechanism

We ended with about 5 designs for the moving part that we’re going to review with the mechanic.
More to be done on next week, as the mechanical drawings should be done at the end of next week!

Clément

• Félix

Si je comprends bien c’est un genre de Harp à 3 faces ?
Du coup les LEDs ne passent jamais par le centre ? Comment vous faites votre 3D ?

Combien de LEDS prévoyez-vous ?
Dans le précédent poste vous parlez de “be used as easily as a regular screen” comment vous comptez faire ça avec de la 3D et votre design du coup ?

• didjcodt

Plutôt un RoseAce à plusieurs couches. Le système en triangle n’est là que pour permettre de fixer des pales comme le fait RoseAce avec son axe central (au problème que l’axe central induit de l’occlusion).

Actuellement on est en train de faire nos tests avec 128 LEDs par pale, et 32 pales (4096 LEDs), une pale étant de l’ordre de 40 cm de longueur. Il va probablement falloir réduire la taille, on verra en fonction de ce que nous dit le mécanicien.

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