Now for the Spider and Secondary Mirror....

6" diameter 1/2" thick aluminum blanks were used to create the pivotable secondary holder with a 3/4"-10 threaded rod. It uses a 2"x2"x6" block of aluminum for the center block of the spider to which the vanes will be attached. The two fans and six vent holes allow air flow to cool the secondary mirror.

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The Spider Vane anchors. Each vane is electrically isolated with teflon sheeting and nylon tube inserts for the screw to go through, so each can carry current to the secondary holder.

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Attached to the back of the 1.5" thick 6" minor axis mirror are thin film heaters....

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The finished holder....

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Connections to the heaters are made....

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The structural elements of the secondary cage....

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