1. Leaf Spring prototype preparation M.Lenti

2. Reminder Piet’s proposal: two dowels inserted into two mirror holes (vertical alignment); mirror weight as counterbalance Two leaf springs (horizontal alignment); pretensioning in nominal “zero” position Piezo actuators out of particles acceptance 14/07/20102M.Lenti

3. Piet’s proposal 14/07/20103M.Lenti

4. Carassiti drawings Delivered on june 3 Original (Piet’s) approach: center of horizontal rotation “on” the mirror “inverted” approach: center of horizontal rotation “far” from the mirror Both taken in consideration 14/07/20104M.Lenti

5. Leaf spring Support 14/07/20105M.Lenti

6. Aluminum clamper 14/07/20106M.Lenti

7. Aluminium Dowel 14/07/20107M.Lenti

8. Aluminium Leaf 14/07/20108M.Lenti Thickness: 0.5 mm Height: 200 mm

9. Aluminium Support 14/07/20109M.Lenti

10. Dowel Aluminium Plate 14/07/201010M.Lenti

11. Piet’s correction June 17 14/07/201011M.Lenti

12. New drawing 14/07/2010M.Lenti12 F.Maletta Can be mounted in with the “original” or “inverted” approach

13. Prototype situation Aluminium raw material arrived last week (!!!) Executive drawings ready Mechanical worshop in Florence ready for working Hope to have the pieces machined by next week 14/07/201013M.Lenti

14. Resonances Estimated by Vito Glass: very low, just above 0 Hz Support structure: 1° resonance around 7.5 Hz 14/07/2010M.Lenti14

15. Conclusions A lot of time lost for material procurement Hope to have some results late in july… 14/07/2010M.Lenti15