Friday, June 12, 2009

And Then... there were 3!!

Today the scalpel finally went in! Or perhaps it was Saint George plunging his sword into the dragon? Either way - it was a big day... the first major mechanical intervention & with that, the end of optical innocence!

Having made all the measurements & carried out all the tests we could stand, it was time have a go at removing M4. This will be necessary for the M5 test that will allow us to evaluate the surface figure of M5 (coming soon to a Karoo clean room).

The mounting blocks for the 3 vanes of the M4 spider each have bolts for tangential & radial adjustment, as well as non-adjusting Z-bolts that secure the desired vertical location. These all had to be undone & removed before the mirror could be extracted.

First the tangential bolts were undone...

Then the radial ones...

& finally the Z-bolts.

With all the bolts removed, M4 & its vane assembly could be lifted out of the SAC & relocated to its cozy new box where it spent the night.

Behold - our new 3 mirror corrector!

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