Some features of my 22" f/4 telescope
Mounted mirrorcell with cooling
fan. The cell was fabricated based on
Kriege and Berrys book
Mirror cell (photo taken during the re-finish project
and nothing was done to the cell during this project, just taken out of
the mirror box.) 1/4" aluminum flotation triangles and
bars. The frame was fabricated with 1" tubular steel and
1.25" flat steel on the sides. The white flotation pads are
the original furniture glides. They are nice and
slippery. The black flotation pads are the non-slip hard
rubber, so the mirror will not shift laterally while on the sling,
especially when the scope is near horizontal.
Lower truss clamp - top view
Unique ball and socket upper clamps.
Upper truss connector detail. From left to
right; 1" Phenolic ball with brass threaded insert, lock nut, large
washer (slightly larger than the diameter of the truss itself, smaller
washer just small enough to fit inside of the truss (to prevent the
connector from moving laterally as the tube insert is not strong enough
to prevent lateral movements), regular nut. All of this is
one a regular threaded rod. I used 5/16-18 threads.
Tube insert inside the truss. Available here. I got mine from a
place I don't remember.
Upper truss clamp assembly (side and top)
Upper Cage (1/2" Baltic Birch with 3/16" Baltic Birch
focuser board) Very light!
Detail of the focuser board. I used 3/16"
Baltic Birch plywood.
Front end of the 22" mirror box and rocker
box. The four furniture glide feet on the "front" side of the
mirror box is there for support during unloading or loading.
When I load or unload the mirror box, I actually place it standing
vertically on the ground on the "front" side, so it is easier for me to
pick it back up.
Same assembly as above, but from the side. The
bearings were made by Obsession for their 18" telescopes. I
decided on these instead of the larger bearings as the larger bearings
has a notch for trusses that are mounted on the outside. That
would not work in my application. The diameter is a little
smaller than I wanted, but my telescope is light enough so it is still
buttery smooth. In fact, this 22" telescope weighs less than
the 18" Obsession. You can get the bearings here.
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