Thanks to the work of Chris Hunter. Curator of Collections and Exhibitions. Schenectady Museum: Suits-Bueche Planetarium (GE's corporate headquarters), I received this close up photo of the shutter.
It appeared to me that the small hinged parts are cast. As you can see the design uses the shutter itself to support the side hinge plates "paddles"(also cast?). The end pieces rotate in the brass cylinders visible from the exterior.
I had a different idea; to run shafts across the entire width and hang the shutters on the shafts. My reasoning was to make the action as light as possible. By hanging the shutters I could relatively light aluminum instead of steel. And since I am not normally one who works with metal or has any metal working tools, the softer the metal the better.
Still, the problem of the cast hinges remained. I landed on the idea of making my version out of two halves of extruded aluminum angle.
|Full size stencils of the hinges glued to the aluminum angle.|
|One rough pair with the four mounting holes drilled. A second pair is in the |
Each pair (there are eight of them) took up to an hour to make... and they are not even done yet.
|A rough cut pair foreground and a rough finished pair background.|