Orion SKYQUEST XX12 - Manual (Page 12)

12
2. Next, assemble the rear end ring to the mirror cell. Find a
clean, flat surface, and turn the mirror cell over so that the
mirror is facing downwards. Place the three springs onto
the three exposed threaded shafts (Figure 17). Lower the
end ring onto the mirror cell so the threaded shafts pass
through it, and the end ring rests on the springs (Figure
18). Add a nylon washer to each collimation knob and
thread the collimation knobs through the end ring and
onto the threaded shafts (Figure 19). Make sure the knobs
have at least three full turns of engagement on the shafts.
The mirror cell is now ready to be installed onto the lower
tube section.
3. Assembling the end ring (and mirror cell) back onto the
tube can be a bit tricky. This is because the large diam-
eter and thin aluminum of the tube will cause the tube
to become somewhat out of round once the end ring is
removed. To assemble the rear end ring (with mirror and
mirror cell now connected) to the tube, stand the lower
section of the tube up vertically so the raw edge of the
tube is facing upwards. Line up the threaded holes in the
edge of the end ring with the holes in the end of the tube.
Then, lower the entire assembly onto the tube. There may
be a bulge in the perimeter of the tube which prevents
the end ring from fully seating onto the tube (Figure 20).
Press against this bulge, and the entire mirror cell assem-
bly should seat onto the tube. Now, replace the six Phillips
head screws that connect the rear end ring to the tube.
4. The cooling accelerator fan can now be connected to the
rear of the mirror cell. Refer to the instruction sheet that
comes with the fan kit for installation instructions.
5. Now, the upper and lower sections of the tube will be
connected with the four truss pole assemblies. This is a
procedure that will be done whenever the telescope has
been disassembled for transport or storage. It is very easy
to do, and should only take a couple of minutes. Start by
connecting the eight clamping knobs on the ends of the
pole assemblies to the lower truss support ring on the
Figure 20. Locate the area of tube that is bulging out and
preventing the end ring from fully seating.
Figure 17. Place the three springs on the exposed threaded
shafts of the mirror cell.
Spring
Shaft
Figure 18. Lower the rear end ring onto the mirror cell so that
the threaded shafts pass through the end ring, and the end ring
rests on the springs.
Figure 19. Thread the collimation knobs, with nylon washers
attached, through the rear end ring and onto the threaded shafts.
Make sure the knobs have at least three full turns of engagement
on the shafts.
Collimation
knob
Nylon
washer