Prototype 12.5" yoke shown below, with graphite epoxy truss in background.


Six collimation bolts pass through the back plate, shown above.

Three act as push screws, putting a force upon the back of the yoke cell, which sits on the other side of the back plate.

The three other bolts act as pull screws, pulling on the yoke cell.

Using this method allows for collimation of the optics as well as the ability to "lock" the mirror cell into place.

Back plates will soon be available in the standard sizes. The first will be complete by the end of August, 2005.


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