Orion XTG instruction manual Assembly of the Dobsonian Base

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Figure 7. Attaching the base feet to the base.

Figure 8. Secure the front panel to each side panel.

2. Assembly

Now that you have unpacked the boxes and familiarized yourself with all the parts in front of you, it is time to begin ­assembly.

Assembly of the Dobsonian Base

The base need only be assembled once, unless you disas- semble it for long-term storage. The assembly process should take about half an hour. All necessary tools are included in the packages. The two ground baseplates arrive preassem- bled with the motors, optical encoders, and motor housings installed. There is a protective strip of polyethylene foam material between the two base plates (Figure 5). Do not attempt to remove this material; it is glued in place. It is designed to keep dust out of the azimuth motor assembly and gears.

During initial assembly it is suggested to fasten the screws just enough to hold the panels together loosely. When all of the components are assembled, then perform the final tight- ening of each screw one or two turns at a time, alternating from one screw to the next to ensure all are tightened evenly. When tightening screws, tighten them until firm, but be careful not to strip the holes by over-tightening.

1.Turn the baseplate assembly upside-down and gently rest it on the azimuth motor housing. Locate the three starter holes on the perimeter of the bottom baseplate (Figure 6). Insert the screws through the feet and thread them into the predrilled starter holes (Figure 7) with the supplied Phillips screwdriver until tight.

2.Connect the side panels to the front panel (Figure 8). Use the coarse thread socket-head screws for this. There are unthreaded pilot holes (without the metal collar) to align these pieces. Orient the side panels so the oval XTg label is facing outward. Orient the front panel so that the pilot holes for the handle and eyepiece rack face out. The side panel with the motor attached is the left panel. There are six screws total (three for each side) to assem- ble. Start by inserting the screws and turning by hand to ensure they are going in straight. When you begin to meet resistance use the 4mm hex key to complete this

Figure 9. The completed side panel and front panel assembly (XT10g shown).

step. Do not completely tighten the screws yet. Having the boards a little loose will help in aligning the assembly to the top baseplate in step 3. The completed assembly should look like Figure 9.

2a. [For XT12g only] Attach a side brace to the outside sur- face of both the left and right side panels. Each side brace is attached with three base assembly wood screws. Insert the screws through the corresponding pre-drilled holes in the side panel and then thread them into the brace using the included 4mm hex key.

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Contents Orion SkyQuest XTg GoTo Dobsonians Overview of SkyQuest XTg Dobsonian 12 shown Unpacking Table of ContentsParts List Base hardware for SkyQuest XTg Box #2 Dobsonian Base Refer to Figures 3Assembly of the Dobsonian Base AssemblyAssembly of the Optical Tube XT12g Only Shaft Spring Accessory Installation Connecting the Optical Tube to Dobsonian BaseEZ Finder Operating the EZ FinderAligning the EZ Finder Replacing the BatteryUsing Eyepieces GoTo Hand Controller Setup for AutoTracking or GoTo Mode Setup for AutoTracking or GoTo ModeScroll Buttons Dual Purpose buttonsBrightest Star Alignment Using the Telescope AutoTracking ModeAlignment for GoTo Operation Two-Star Alignment SW 235SEObject Database in the Hand Controller Using the Telescope in GoTo ModeSelecting an Object Pointing Accuracy Enhancement PAEUtility Functions Other FunctionsTracking Setup FunctionsPage Saving an object to the database Using the User Defined DatabaseRecalling a user-defined object Identifying an Unknown ObjectPreparing the Computer for the Update Disconnecting from the ComputerLinking with a Computer Updating the GoTo Hand Controller’s FirmwareCollimation Cap and Mirror Center Mark Collimating the Optical SystemPreparing the Telescope for Collimating Aligning the Secondary MirrorStar-Testing the Telescope Using Your TelescopeFocusing the Telescope Aligning the Primary MirrorAiming/Pointing the Telescope Viewing with EyeglassesMagnification 1200mm = 42x 28mmAstronomical Observing Moon Astronomical ObjectsCleaning Mirrors Care and MaintenanceCleaning Eyepiece Lenses SkyQuest XT10g SpecificationsSkyQuest XT8g SkyQuest XT12g Menu Tree Appendix a Time Zones of the World Sending a Slow-GoTo Command Additional RS-232 Commands Sending a Tracking RateResetting the Position of Azimuth or Altitude Appendix B RS-232 ConnectionStar Charts Page Page Page Page Page One-Year Limited Warranty

XTG specifications

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