Orion 10026 XT6i, 10020 XT12i, 10018 XT8i Assembly, Box #3 XT12i only Primary mirror and cell

Figure 1.2. To remove the rear end ring, unthread the screws that connect it to the tube.

Figure 1.3. Place the three springs on the exposed threaded shafts of the mirror cell.

Figure 1.4. 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.

3 Plastic feet

3Feet attachment wood screws (length 1")

5Encoder board mounting wood screws

1Brass bushing

1Azimuth axis hex-head screw (length 2.25")

2Fender washers (diameter 1")

1Hex lock nut

4Altitude bearing cylinders

4Altitude bearing cylinder screws (length 1.5", black)

1Vertical stop knob

1Small thin Azimuth Encoder board washer

3Vertical stop knob washers

Box #3 (XT12i only): Primary mirror and cell

Qty Description

1Primary mirror

1Mirror cell

3Collimation knobs

3Nylon washers

3Springs

2. Assembly

Now that you have unpacked the boxes and familiarized your- self with all the parts in front of you, it’s time to begin assembly. The optics of the XT6i, XT8i, and XT10i are already installed inside the tube, so most of the required assembly concerns the Dobsonian base. Skip to “Assembly of the Dobsonian Base.” For the XT12i, the primary mirror is shipped in a sepa- rate box and will have to be installed in the optical tube. If you purchased the XT12i, start with the next paragraph for instructions on how to install the mirror into the tube.

Assembly of the Optical Tube (XT12i only)

In order to prevent damage to the primary mirror in shipment, it is shipped in its cell separately from the optical tube. To install the mirror cell into the optical tube, the rear end ring attached to the optical tube must first be removed. This is done by unthreading and removing the Phillips-head screws that connect the end ring to the tube (Figure 1.2), and then pulling the end ring off of 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 tube’s edge. Also be careful not to pinch your fingers when attaching the assembled mirror cell onto the tube.

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