Orion SKYQUEST XTG User Manual download pdf (Page 7)

ing the six Phillips-head screws that connect the end ring

to the tube (Figure 12), and then pulling the end ring off

the tube.

Warning: Once the rear end ring is removed from the

tube, the raw edge of the tube itself will be exposed. Be

careful not to cut or otherwise hurt yourself on the tubeís

edge. Also, be careful not to pinch your fingers when re-

attaching the assembled mirror cell onto the tube.

Next, assemble the rear end ring to the mirror cell. Find a 2.

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 13). Lower

the end ring onto the mirror cell so the threaded shafts

pass through it, and the end ring rests on the springs

(Figure 14). Add a nylon washer to each collimation

knob and thread the collimation knobs through the end

ring and onto the threaded shafts (Figure 15). 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.

Assembling the end ring back onto the tube can be a bit 3.

tricky. This is because the large diameter and thin alumi-

num 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 con-

nected) to the tube, stand the tube up vertically so the

raw edge of the tube is facing upwards. Line up the

threaded holes in the edge of the mirror cell end ring with

the holes in the end of the tube. Then, lower the entire

mirror cell assembly onto the tube. There may be a bulge

in the perimeter of the tube which prevents the mirror

cell from fully seating onto the tube (Figure 16). Press

against this bulge, and the entire mirror cell should seat

onto the tube. Now, replace the six Phillips-head screws

that connect the rear end ring to the tube.

Figure 16. Locate the area of tube that is bulging out and

preventing the end ring from fully seating.

Figure 13. Place the three springs on the exposed threaded

shafts of the mirror cell.

Spring

Shaft

Figure 14. 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 15. 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

1 2 3 4 5 6 7 8 9 10 11 12 ... 36 37

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Orion SKYQUEST XTG User Manual Page 7

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